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java连点器代码 连点器的代码
java 写的计算器源代码只实现加减乘除四则运算即可
import java.awt.*;
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import java.awt.event.*;
import javax.swing.*;
import java.util.Vector;
public class calculator
{
String str1="0"; //运算数1 初值一定为0 为了程序的安全
String str2="0"; //运算数2
String fh="+"; //运算符
String jg="";//结果
//状态开关 重要
int k1=1;//开关1 用于选择输入方向 将要写入str2或 str2
int k2=1;//开关2 符号键 次数 k21说明进行的是2+3-9+8 这样的多符号运算
int k3=1;//开关3 str1 是否可以被清0 ==1时可以 !=1时不能被清0
int k4=1;//开关4 str2 同上
int k5=1;//开关5 控制小数点可否被录入 ==1时可以 !=1 输入的小数点被丢掉
JButton jicunqi; //寄存器 记录 是否连续按下符号键
Vector vt=new Vector(20,10);
JFrame frame=new JFrame("sunshine---计算器");
JTextField jg_TextField=new JTextField(jg,20);//20列
JButton clear_Button=new JButton("清除");
JButton button0=new JButton("0");
JButton button1=new JButton("1");
JButton button2=new JButton("2");
JButton button3=new JButton("3");
JButton button4=new JButton("4");
JButton button5=new JButton("5");
JButton button6=new JButton("6");
JButton button7=new JButton("7");
JButton button8=new JButton("8");
JButton button9=new JButton("9");
JButton button_Dian=new JButton(".");
JButton button_jia=new JButton("+");
JButton button_jian=new JButton("-");
JButton button_cheng=new JButton("*");
JButton button_chu=new JButton("/");
JButton button_dy=new JButton("=");
public static void main(String[] args)
{
calculator calculator=new calculator();
}
calculator()
{
jg_TextField.setHorizontalAlignment(JTextField.RIGHT );//文本框 右对齐
JPanel pan=new JPanel();
pan.setLayout(new GridLayout(4,4,5,5));//四行四列 边距为5像素
pan.add(button7);
pan.add(button8);
pan.add(button9);
pan.add(button_chu);
pan.add(button4);
pan.add(button5);
pan.add(button6);
pan.add(button_cheng);
pan.add(button1);
pan.add(button2);
pan.add(button3);
pan.add(button_jian);
pan.add(button0);
pan.add(button_Dian);
pan.add(button_dy);
pan.add(button_jia);
pan.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));//pan对象的边距
JPanel pan2=new JPanel();
pan2.add(jg_TextField);
JPanel pan3=new JPanel(); //为什么要 多此一句呢？ 因为我不会设置 按钮的大小
pan3.setLayout(new FlowLayout());
pan3.add(clear_Button);
//clear_Button.setSize(10,10);//设置清零按钮的大小 吗的 不好使 ！！
frame.setLocation(300, 200); //主窗口 出现在位置
frame.setResizable(false); //不能调大小
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(pan2,BorderLayout.NORTH);
frame.getContentPane().add(pan,BorderLayout.CENTER);
frame.getContentPane().add(pan3,BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
//以上是 控件 和 布局
//下面是事件处理 程 序
//--------------- 数 字 键 ----------------
class JianTing implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String ss=((JButton)e.getSource()).getText();
jicunqi=(JButton)e.getSource();
vt.add(jicunqi);
if (k1==1)
{
if(k3==1)
{
str1="";
k5=1;//还原开关k5状态
}
str1=str1+ss;
//k2=1;
k3=k3+1;
//System.out.println(str1);
jg_TextField.setText(str1);//显示
}
else if(k1==2)
{
if (k4==1)
{
str2="";
k5=1; //还原开关k5状态
}
str2=str2+ss;
//k2=2;
k4=k4+1;
///////////////测试////////////////
jg_TextField.setText(str2);
}
}
}
//－－－－－－－－符 号－－－－－－－－－－－
class JianTing_fh implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String ss2=((JButton)e.getSource()).getText();
jicunqi=(JButton)e.getSource();
vt.add(jicunqi);
if(k2==1)
{
k1=2;//开关 k1 为1时,向数1写 为2时，向数2写
k5=1;
fh=ss2;
k2=k2+1;//按符号键的次数
}
else
{
int a=vt.size();
JButton c=(JButton)vt.get(a-2); if(!(c.getText().equals("+"))!(c.getText().equals("-"))!(c.getText().equals("*"))!(c.getText().equals("/")))
{
yuns();
str1=jg;
k1=2;//开关 k1 为1时,向数1写 为2时，向数2写
k5=1;
k4=1;
fh=ss2;
} k2=k2+1;
}
}
}
//－－－－－－－－清除－－－－－－－
class JianTing_clear implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jicunqi=(JButton)e.getSource();
vt.add(jicunqi);
k5=1;
k2=1;
k1=1;
k3=1;
k4=1;
str1="0";
str2="0";
fh="";
jg="";
jg_TextField.setText(jg);
vt.clear();
}
}
//----------------等 于 ---------------------
class JianTing_dy implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jicunqi=(JButton)e.getSource();
vt.add(jicunqi);
yuns();
k1=1; //还原开关k1状态
//str1=jg;
k2=1;
k3=1;//还原开关k3状态
k4=1; //还原开关k4状态
str1=jg; //为7+5=12 +5=17 这种计算做准备
}
}
//----------------小数点 ---------------------
class JianTing_xiaos implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jicunqi=(JButton)e.getSource();
vt.add(jicunqi);
if(k5==1)
{
String ss2=((JButton)e.getSource()).getText();
if (k1==1)
{
if(k3==1)
{
str1="";
k5=1; //还原开关k5状态
}
str1=str1+ss2;
//k2=1;
k3=k3+1;
//System.out.println(str1);
jg_TextField.setText(str1);//显示
}
else if(k1==2)
{
if (k4==1)
{
str2="";
k5=1; //还原开关k5状态
}
str2=str2+ss2;
//k2=2;
k4=k4+1;
///////////////测试////////////////
jg_TextField.setText(str2);
}
}
k5=k5+1;
}
}
//注册 监听器
JianTing_dy jt_dy=new JianTing_dy();
JianTing jt= new JianTing();//临听数字键
JianTing_fh jt_fh= new JianTing_fh();//临 听符 号键
JianTing_clear jt_c=new JianTing_clear(); //清除键
JianTing_xiaos jt_xs=new JianTing_xiaos();// 小数点 键
button7.addActionListener(jt);
button8.addActionListener(jt);
button9.addActionListener(jt);
button_chu.addActionListener(jt_fh);
button4.addActionListener(jt);
button5.addActionListener(jt);
button6.addActionListener(jt);
button_cheng.addActionListener(jt_fh);
button1.addActionListener(jt);
button2.addActionListener(jt);
button3.addActionListener(jt);
button_jian.addActionListener(jt_fh);
button0.addActionListener(jt);
button_Dian.addActionListener(jt_xs);
button_dy.addActionListener(jt_dy);
button_jia.addActionListener(jt_fh);
clear_Button.addActionListener(jt_c);
//关闭事件处理程序
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
//---------------计 算------------------
public void yuns()
{
double a2,b2;//运算数1,2
String c=fh;// 运算符
double jg2=0 ;//结果
if (c.equals(""))
{
//System.out.println("请输入运算符");
jg_TextField.setText("请输入运算符");
}
else
{
System.out.println("str1:"+str1);//调试时 使 用
System.out.println("str2:"+str2);//调试时 使 用
System.out.println("运算符:"+fh);//调试时 使 用
if (str1.equals(".")) //字符串 "." 转换成double型数据时 会出错 所以手工转
str1="0.0";
if (str2.equals("."))
str2="0.0";
a2=Double.valueOf(str1).doubleValue();
b2=Double.valueOf(str2).doubleValue();
System.out.println("double型的a2："+a2); //调试时 使 用
System.out.println("double型的b2："+b2); //调试时 使 用
if (c.equals("+"))
{
jg2=a2+b2;
}
if (c.equals("-"))
{
jg2=a2-b2;
}
if (c.equals("*"))
{
jg2=a2*b2;
}
if (c.equals("/"))
{
if(b2==0)
{
jg2=0;//0000000000000 by 0 cu!
}
else
{
jg2=a2/b2;
}
}
System.out.println("double型a2"+fh+"b2结果："+jg2);
System.out.println();
jg=((new Double(jg2)).toString());
jg_TextField.setText(jg);
}
}
}
怎么用java代码连接到服务器？
用Socket类去连接
String ip = "192.168.0.57";
int port=7000;
InputStream in;
OutputStream out;
Socket sock = null;
try {
sock = new Socket(ip,port);
sock.setSoTimeout(60*1000);//设置超时
this.in = sock.getInputStream();
this.out = sock.getOutputStream();
} catch (Exception e) {
throw new Exception("与终端连接失败!");
}
求JAVA做的计算器完整代码，Applet实现。
下面两个可以么，是我做实验答辩时用到的！
import java.awt.*;//AWT核心包
import java.awt.event.*;//提供事件类和监听器
public class Counter extends Frame implements ActionListener
{
TextField t=new TextField("");//文本框
Panel p1=new Panel();//new一个panel,用于存放数字键和符号键。
Panel p2=new Panel();//new一个panel,用于存放开方、平方、和清除键。
Button[] b=new Button[10];//实例化Button对象
Button bAdd=new Button("加");
Button bSub=new Button("减");
Button bMul=new Button("乘以");
Button bPoint=new Button(".");
Button bDiv=new Button("除以");
Button bEqual=new Button("等於");
Button bSqrt=new Button("开方");
Button bPow=new Button("平方");
Button bNull=new Button("清除");
String str1=""; //str1和str2存放两个输入的数
String str2="";
String operator=null; //存放加减乘除以及开平方的符号
boolean first=true; //检验输入的是否为第一个数
int countOper=0; //累计输入符号的个数，连加连减等操作中会用到
double result=0.0; //暂存结果
double num1=0.0,num2=0.0; //两个输入的数做运算时转化为double存放
boolean error=false; //检验除数是否为0
//构造方法
public Counter()
{
Frame s=new Frame("计算器");//创建Frame
for(int i=0;i10;i++)//利用for循环将数字键添加进p1中
{
b[i]=new Button(String.valueOf(i));
p1.add(b[i]);
b[i].setActionCommand("number");
b[i].setForeground(new Color(150,20,20));
b[i].addActionListener(this);//调用addActionListener()方法注册事件监听器
}
p1.add(bPoint);
bPoint.setActionCommand("number");
p1.add(bAdd); //数字键，符号键放置在panel的p1中
p1.add(bSub);
p1.add(bMul);
p1.add(bDiv);
p1.add(bEqual);
p2.add(bSqrt);//开方键，平方键，清除键放置在panel的p2中
p2.add(bPow);
p2.add(bNull);
bAdd.setActionCommand("oper");
bSub.setActionCommand("oper");
bMul.setActionCommand("oper");
bDiv.setActionCommand("oper");
bAdd.setForeground(Color.red);//为组键设计颜色
bSub.setForeground(Color.red);
bMul.setForeground(Color.red);
bDiv.setForeground(Color.red);
bPoint.setForeground(Color.black);
bEqual.setForeground(Color.red);
bSqrt.setForeground(Color.blue);
bPow.setForeground(Color.blue);
bNull.setForeground(Color.blue);
bAdd.addActionListener(this);//调用addActionListener()方法注册事件监听器
bSub.addActionListener(this);
bMul.addActionListener(this);
bDiv.addActionListener(this);
bPoint.addActionListener(this);
bEqual.addActionListener(this);
bSqrt.addActionListener(this);
bPow.addActionListener(this);
bNull.addActionListener(this);
p1.setLayout(new GridLayout(4,4,5,5));//网格布局管理器，把容器根据行数和列数分成同样大小的单元，
//每个单元可容纳一个组件，并且此组件会填满网格单元，不能控
//制其占据网格的大小。4、4为网格的行、列数。5、5为组建之间的
//间距
p2.setLayout(new FlowLayout());//用FlowLayout布局管理器将组建默认剧中排放，默认间隙为5个像素
add(t,"North"); //frame的north放置输入框，panel放置在center和south
add(p1,"Center");//将p1添加到Center中
add(p2,"South");//将p2添加到South中
setLocation(400,200);//设计按钮尺寸
setSize(200,200);//设计窗口尺寸
setBackground(new Color(20,200,10));//设置Frame的背景，默认为白色
setVisible(true);//设置Frame设置为可见
addWindowListener(new WindowAdapter(){ //关闭窗口功能
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
//实现接口ActionListener
public void actionPerformed(ActionEvent e)
{
Button temp=(Button)e.getSource();
if(e.getActionCommand().equals("number"))
{
if(first)
{
str1=str1+temp.getLabel();
t.setText(str1);//将输入的str1显示在文本框中
}
else
{
str2=str2+temp.getLabel();
t.setText(str2);//将输入的str2显示在文本框中
}
}
else if(e.getActionCommand().equals("oper"))
{
if(str1=="") //如果还没有输入数就点击运算符执行if
{
countOper=0;//若此，则将计数清零
first=true;
}
else
{
countOper++;//计算输入符号的个数
if(countOper1)//若输入的符号个数多余一个，则可以进行计算
{
getResult();
}
operator=temp.getLabel();//存放加减乘除以及开方、平方的符号
first=false;
}
}
else if(e.getActionCommand().equals("开方"))
{
double d=Math.sqrt(Double.parseDouble(str1));
str1=String.valueOf(d);//将计算出来的结果再次传给str1，为连计算准备
t.setText(String.valueOf(d));//将计算出来的结果传至文本框中
first=false;//置为false，即已输入第一个数
}
else if(e.getActionCommand().equals("平方"))
{
double f=Math.pow(Double.parseDouble(str1),2);
str1=String.valueOf(f);
t.setText(String.valueOf(f));
first=false;
}
else if(e.getActionCommand().equals("清除"))
{
str1="";//清空
str2="";
t.setText("");//将文本框清空
countOper=0;//将按键计数器清零
first=true;
error=false;
}
else if(e.getActionCommand().equals("等於"))
{
if((str1=="")||(str2=="")) //两个数没有输全就点击等号，执行if
{
countOper=0;//将按键计数器清零
first=true;
}
else
{
getResult();
countOper=0;
}
}
}
//运算结果的方法
public void getResult()
{
num1=Double.parseDouble(str1);
num2=Double.parseDouble(str2);
if(operator.equals("加"))
{
result=num1+num2;
}
else if(operator.equals("减"))
{
result=num1-num2;
}
else if(operator.equals("乘以"))
{
result=num1*num2;
}
else if(operator.equals("除以"))
{
if(num2==0.0) //除数为0的处理方法
{
error=true;
}
else
{
result=num1/num2;
}
}
if(error)
{
t.setText("error");
}
else
{
t.setText(String.valueOf(result));
str1=String.valueOf(result); //运算后把结果放入str1中，str2清空，为连加连减等操作做准备
str2="";
}
}
//主方法
public static void main(String[] args)
{
new Counter();//创建一个对象"计算器"
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CalculatorPanel extends JPanel
implements ActionListener
{ public CalculatorPanel()
{ setLayout(new BorderLayout());
display = new JTextField("0");
display.setEditable(false);
add(display, "North");
JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = "789/456*123-0.=+";
for (int i = 0; i buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, "Center");
}
private void addButton(Container c, String s)
{ JButton b = new JButton(s);
c.add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent evt)
{ String s = evt.getActionCommand();
if ('0' = s.charAt(0) s.charAt(0) = '9'
|| s.equals("."))
{ if (start) display.setText(s);
else display.setText(display.getText() + s);
start = false;
}
else
{ if (start)
{ if (s.equals("-"))
{ display.setText(s); start = false; }
else op = s;
}
else
{ calculate(Double.parseDouble(display.getText()));
op = s;
start = true;
}
}
}
public void calculate(double n)
{ if (op.equals("+")) arg += n;
else if (op.equals("-")) arg -= n;
else if (op.equals("*")) arg *= n;
else if (op.equals("/")) arg /= n;
else if (op.equals("=")) arg = n;
display.setText("" + arg);
}
private JTextField display;
private double arg = 0;
private String op = "=";
private boolean start = true;
}
public class CalculatorApplet extends JApplet
{ public void init()
{ Container contentPane = getContentPane();
contentPane.add(new CalculatorPanel());
}
}
java编一个计算器的代码
界面漂亮堪比系统自带计算器，功能完美加减乘除开平方等等全部具备，还有清零按钮，小数点的使用，连加连乘功能完全参考系统官方计算器经过长期调试改进而成，马上拷贝代码拿去试试看吧，绝不后悔！
代码如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu();
JMenu menuFile1 = new JMenu();
JMenu menuFile2 = new JMenu();
JMenu menuFile3 = new JMenu();
JMenuItem menuFileExit = new JMenuItem();
menuFile.setText("文件");
menuFile1.setText("编辑");
menuFile2.setText("查看");
menuFile3.setText("帮助");
menuFileExit.setText("退出");
menuFileExit.addActionListener
(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
CounterFrame.this.windowClosed();
}
}
);
menuFile.add(menuFileExit);
menuBar.add(menuFile);
menuBar.add(menuFile1);
menuBar.add(menuFile2);
menuBar.add(menuFile3);
setTitle("计算器");
setJMenuBar(menuBar);
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
for(int i=0;i20;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==5||i==6||i==7||i==10||i==11||i==12||i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==17)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==18)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==4)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
text.setText(String.valueOf(Math.sqrt(cq)));
}
});
}
if(i==8)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==19)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
JButton jb1=new JButton("Backspace");
JButton jb2=new JButton(" CE ");
JButton jb3=new JButton(" C ");
this.add(jb1);
this.add(jb2);
this.add(jb3);
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String back=Tool.getinstance().getfield().getText();
text.setText(backmethod(back));
Centercenter.Vec.remove(Centercenter.Vec.size()-1);
}
});
jb3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
text.setText("0.");
Centercenter.Vec.clear();
Centercenter.Vec.add(".");
Centercenter.vc.add("a");
Centercenter.begin="yes";
Centercenter.vc1.clear();
Centercenter.what=null;
Centercenter.tool=0;
}
});
}
public String backmethod(String str)
{
return str.substring(0,str.length()-1);
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
this.setLayout(new GridLayout(4,1,3,3));
this.add(new JButton("MC"));
this.add(new JButton("MR"));
this.add(new JButton("MS"));
this.add(new JButton("M+"));
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
---------------------------------------------------------------------------
=============《按你要求特意后改过的最简单功能的代码如下》========================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter2 {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
setTitle("计算器");
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","4","5","6","*","1","2","3","-","0","=",".","+"};
for(int i=0;i16;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==4||i==5||i==6||i==8||i==9||i==10||i==12)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==14)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==11)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==7)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
------------------------------------------------------------
才子_辉祝您愉快！
java算24点代码：输入4个数算24点，能够在命令提示符下就可以运行。100多
import java.util.Scanner;
/** 给定4个数字计算24 */
public class Core {
private double expressionResult = 24;
// private int maxLine=10;
private boolean error = true;
private double numbers[] = new double[4];
public Object resultReturn;
/**
* 该对象拥有3个私有变量 expressionResult,所需结果 maxLine,输出结果每页行数 error,是否出错
* numbers[4],记录用来运算的4个数
*
* 其次,该对象拥有以下方法供外部调用 setNumbers(double[] 运算的数) 输入用来运算的数,4个时才能计算,无返回
* setMaxLine(int 行数) 输入每页的行数,无返回 getMaxLine() 返回每页的行数,类型为int
* setExpressionResult(double 所需结果) 输入所需结果,无返回 getExpressionResult()
* 返回所需结果,类型为double getExpression() 返回可得出所需结果的表达式,类型为字符串数组
*
* 最后,私有方法均为计算与表达式转换部分
*/
// 测试使用
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int[] arr = new int[4];
System.out.print("输入第一个数：");
arr[0] = scanner.nextInt();
System.out.print("输入第二个数：");
arr[1] = scanner.nextInt();
System.out.print("输入第三个数：");
arr[2] = scanner.nextInt();
System.out.print("输入第四个数：");
arr[3] = scanner.nextInt();
Core s = new Core();
s.setNumbers(arr);
String[] output = s.getExpression();
for (int i = 0; i output.length; i++) {
System.out.println(output[i]);
}
}
/** 设定被计算的四个数，由于是数组，所以具有容错功能(不为4个数) */
public void setNumbers(double[] n) {
if (n.length == 4) {
error = false;
numbers = n;
} else
error = true;
}
public void setNumbers(int[] n) {
if (n.length == 4) {
error = false;
for (int i = 0; i 4; i++) {
numbers[i] = n[i];
}
} else
error = true;
}
/** 设定每页显示的行数 */
// public void setMaxLine(int n) {
// if (n0) {
// maxLine=n;
// }
// }
// /** 返回每页显示的行数 */
// public int getMaxLine() {
// return maxLine;
// }
/** 设定需要得到的结果 */
public void setExpressionResult(double n) {
expressionResult = n;
}
/** 返回所需结果 */
public double expressionResult() {
return expressionResult;
}
/** 返回符合条件的表达式 */
public String[] getExpression() {
if (!error) {
String[] expression = calculate(numbers);
return expression;
} else
return new String[] { "出错了,输入有误" };
}
/** cal24()，输出结果为24的表达式 */
private String[] calculate(double[] n) {
if (n.length != 4)
return new String[] { "Error" };
double[] n1 = new double[3];
double[] n2 = new double[2];
String[] resultString = new String[1024]; // 最多1000组解,暂时未溢出
int count = 0;
boolean isRepeat = false;
for (int t1 = 0; t1 6; t1++) {
for (int c1 = 0; c1 6; c1++) {
for (int t2 = 0; t2 3; t2++) {
for (int c2 = 0; c2 6; c2++) {
for (int c3 = 0; c3 6; c3++) {
if ((c1 / 3 == c2 / 3 (c1 % 3) * (c2 % 3) != 0)
|| (c2 / 3 == c3 / 3 (c2 % 3) * (c3 % 3) != 0)
|| (c1 / 3 == c3 / 3
(c1 % 3) * (c3 % 3) != 0 t2 == 2)) {
// 去除连减连除的解,因为x/(y/z)=x*z/y
continue;
}
n1 = cal1(n, t1, c1);
n2 = cal2(n1, t2, c2);
double result = cal(n2[0], n2[1], c3);
if ((result - expressionResult) 0.00000001
(expressionResult - result) 0.00000001) {
resultString[count] = calString(n, t1, c1, t2,
c2, c3)
+ "=" + (int) expressionResult;
for (int i = 0; i count; i++) {
isRepeat = false;
if (resultString[i]
.equals(resultString[count])) { // 去除完全重复的解
isRepeat = true;
break; // 提前退出循环
}
}
if (c1 == c2 c2 == c3 c1 % 3 == 0
t1 + t2 != 0) { // 连加连乘
isRepeat = true;
}
if (!isRepeat) {
count++;
}
}
}
}
}
}
}
if (count == 0)
return new String[] { "该组数无解" };
String[] resultReturn = new String[count];
System.arraycopy(resultString, 0, resultReturn, 0, count);
return resultReturn;
}
/** cal1()，将4个数计算一次后返回3个数 */
private double[] cal1(double[] n, int t, int c) { // t为原来的t1，c为原来的c1
double[] m = new double[3];
switch (t) {
case 0:
m[1] = n[2];
m[2] = n[3];
m[0] = cal(n[0], n[1], c);
break;
case 1:
m[1] = n[1];
m[2] = n[3];
m[0] = cal(n[0], n[2], c);
break;
case 2:
m[1] = n[1];
m[2] = n[2];
m[0] = cal(n[0], n[3], c);
break;
case 3:
m[1] = n[0];
m[2] = n[3];
m[0] = cal(n[1], n[2], c);
break;
case 4:
m[1] = n[0];
m[2] = n[2];
m[0] = cal(n[1], n[3], c);
break;
default:
m[1] = n[0];
m[2] = n[1];
m[0] = cal(n[2], n[3], c);
}
return m;
}
/** cal2()，将3个数计算一次后返回2个数 */
private double[] cal2(double[] n, int t, int c) { // t为原来的t2，c为原来的c2
double[] m = new double[2];
switch (t) {
case 0:
m[1] = n[2];
m[0] = cal(n[0], n[1], c);
break;
case 1:
m[1] = n[1];
m[0] = cal(n[0], n[2], c);
break;
default:
m[1] = n[0];
m[0] = cal(n[1], n[2], c);
}
return m;
}
/** cal()，将2个数计算后返回结果 */
private double cal(double n1, double n2, int c) { // n1,n2为运算数，c为运算类型
switch (c) {
case 0:
return n1 + n2;
case 1:
return n1 - n2;
case 2:
return n2 - n1;
case 3:
return n1 * n2;
case 4:
if (n2 == 0)
return 9999; // 使计算结果必不为24
else
return n1 / n2;
default:
if (n1 == 0)
return 9999; // 同上
else
return n2 / n1;
}
}
/** calString()，输出表达式 */
private String calString(double[] n, int t1, int c1, int t2, int c2, int c3) {
String[] nString = new String[4];
switch (t1) {
case 0:
nString[0] = calString2("" + (int) n[0], "" + (int) n[1], c1);
nString[1] = "" + (int) n[2];
nString[2] = "" + (int) n[3];
break;
case 1:
nString[0] = calString2("" + (int) n[0], "" + (int) n[2], c1);
nString[1] = "" + (int) n[1];
nString[2] = "" + (int) n[3];
break;
case 2:
nString[0] = calString2("" + (int) n[0], "" + (int) n[3], c1);
nString[1] = "" + (int) n[1];
nString[2] = "" + (int) n[2];
break;
case 3:
nString[0] = calString2("" + (int) n[1], "" + (int) n[2], c1);
nString[1] = "" + (int) n[0];
nString[2] = "" + (int) n[3];
break;
case 4:
nString[0] = calString2("" + (int) n[1], "" + (int) n[3], c1);
nString[1] = "" + (int) n[0];
nString[2] = "" + (int) n[2];
break;
default:
nString[0] = calString2("" + (int) n[2], "" + (int) n[3], c1);
nString[1] = "" + (int) n[0];
nString[2] = "" + (int) n[1];
}
if ((c2 / 3 c1 / 3 (t2 != 2 || c2 / 3 == c3 / 3))
|| ((c3 / 3 c1 / 3 + c2 / 3) t2 == 2)
|| (c3 == 1 c1 / 3 == 0)) // 特定情况下加上一个括号*****************************
nString[0] = '(' + nString[0] + ')';
switch (t2) {
case 0:
nString[0] = calString2(nString[0], "" + nString[1], c2);
nString[1] = nString[2];
break;
case 1:
nString[0] = calString2(nString[0], nString[2], c2);
break;
default:
nString[3] = nString[0];
nString[0] = calString2(nString[1], nString[2], c2);
nString[1] = nString[3];
}
if (c3 / 3 c2 / 3 || (c3 == 2 nString[0].indexOf('+') = 0)) // 特定情况下加上一个括号*****************************
nString[0] = '(' + nString[0] + ')';
return calString2(nString[0], nString[1], c3);
}
/** calString()，根据符号输出一部运算表达式 */
private String calString2(String n1, String n2, int c) {
switch (c) {
case 0:
return n1 + '+' + n2;
case 1:
return n1 + '-' + n2;
case 2:
return n2 + '-' + n1;
case 3:
return n1 + '*' + n2;
case 4:
return n1 + '/' + n2;
default:
return n2 + '/' + n1;
}
}
}
java代码中三个小数点连在一起表示什么
可变参数列表。一般用在最后一个参数上。比如public static void main(String... args),它就可以匹配许多参数调用。像main();
main(null);
main(null,null);
main(null,null,null);
......
main("a");
main("a","b");
main("a","b","c");
......
main(new String[]{});这些形状的调用都可以。一般在不固定参数输入时使用。比如一个exe程序执行时，你可以带若干个参数之类的。C里面的printf就是一个这样的参数，所以你打印时，可以在前面格式字串中用转义字符，后面跟相关的好几个参数。个数不限，可以是一个也可以是两个、三个……只要跟前面的转义字符匹配即可。
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