房贷计算器java源代码 月薪房贷计算器

急求JAVA计算器源代码

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html

applet code=SZJSQ.class width=400 height=180

/applet

/html

//APPLET

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.applet.*;

public class SZJSQ extends JApplet implements ActionListener

{

boolean i=true;

private JButton num0=new JButton("0");

private JButton num1=new JButton("1");

private JButton num2=new JButton("2");

private JButton num3=new JButton("3");

private JButton num4=new JButton("4");

private JButton num5=new JButton("5");

private JButton num6=new JButton("6");

private JButton num7=new JButton("7");

private JButton num8=new JButton("8");

private JButton num9=new JButton("9");

private JButton zuok=new JButton("(");

private JButton youk=new JButton(")");

private JButton dian=new JButton(".");

private JButton NULL=new JButton("N");

private JButton plu=new JButton("+");

private JButton min=new JButton("-");

private JButton mul=new JButton("x");

private JButton div=new JButton("/");

private JButton equ=new JButton("=");

private JButton cle=new JButton("C");//清除

private JTextField space=new JTextField(30);

public void init()

{

JPanel text=new JPanel();

text.setLayout(new FlowLayout());

text.add(space);

JPanel buttons=new JPanel();

buttons.setLayout(new GridLayout(5,4));

buttons.add(num9);

buttons.add(num8);

buttons.add(num7);

buttons.add(plu);

buttons.add(num6);

buttons.add(num5);

buttons.add(num4);

buttons.add(min);

buttons.add(num3);

buttons.add(num2);

buttons.add(num1);

buttons.add(mul);

buttons.add(num0);

buttons.add(cle);

buttons.add(equ);

buttons.add(div);

buttons.add(zuok);

buttons.add(youk);

buttons.add(dian);

buttons.add(NULL);

(num9).addActionListener(this);

(num8).addActionListener(this);

(num7).addActionListener(this);

(num6).addActionListener(this);

(num5).addActionListener(this);

(num4).addActionListener(this);

(num3).addActionListener(this);

(num2).addActionListener(this);

(num1).addActionListener(this);

(num0).addActionListener(this);

(plu).addActionListener(this);

(min).addActionListener(this);

(mul).addActionListener(this);

(div).addActionListener(this);

(equ).addActionListener(this);

(cle).addActionListener(this);

(zuok).addActionListener(this);

(youk).addActionListener(this);

(dian).addActionListener(this);

setLayout(new BorderLayout());

add("North",text);

add("South",buttons);

space.setText("0");

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==num9)

{

if(i==true)

{

space.setText("9");

i=false;

}

else space.setText(space.getText()+'9');

}

if(e.getSource()==num8)

{

if(i==true)

{

space.setText("8");

i=false;

}

else space.setText(space.getText()+'8');

}

if(e.getSource()==num7)

{

if(i==true)

{

space.setText("7");

i=false;

}

else space.setText(space.getText()+'7');

}

if(e.getSource()==num6)

{

if(i==true)

{

space.setText("6");

i=false;

}

else space.setText(space.getText()+'6');

}

if(e.getSource()==num5)

{

if(i==true)

{

space.setText("5");

i=false;

}

else space.setText(space.getText()+'5');

}

if(e.getSource()==num4)

{

if(i==true)

{

space.setText("4");

i=false;

}

else space.setText(space.getText()+'4');

}

if(e.getSource()==num3)

{

if(i==true)

{

space.setText("3");

i=false;

}

else space.setText(space.getText()+'3');

}

if(e.getSource()==num2)

{

if(i==true)

{

space.setText("2");

i=false;

}

else space.setText(space.getText()+'2');

}

if(e.getSource()==num1)

{

if(i==true)

{

space.setText("1");

i=false;

}

else space.setText(space.getText()+'1');

}

if(e.getSource()==num0)

{

if(i==true)

{

space.setText("0");

i=false;

}

else space.setText(space.getText()+'0');

}

if(e.getSource()==zuok)

{

if(i==true)

{

space.setText("(");

i=false;

}

else space.setText(space.getText()+'(');

} if(e.getSource()==youk)

{

if(i==false)

space.setText(space.getText()+')');

}

if(e.getSource()==dian)

{

if(i==false)

space.setText(space.getText()+'.');

}

if(e.getSource()==plu)

{

space.setText(space.getText()+'+');

i=false;

}

if(e.getSource()==min)

{

space.setText(space.getText()+'-');

i=false;

}

if(e.getSource()==mul)

{

space.setText(space.getText()+'*');

i=false;

}

if(e.getSource()==div)

{

space.setText(space.getText()+'/');

i=false;

}

if(e.getSource()==equ)

{

space.setText(String.valueOf(Calculator(space.getText())));

i=true;

}

if(e.getSource()==cle)

{

space.setText("0");

i=true;

}

}

public double Calculator(String f)//科学计算

{

int i=0,j=0,k;

char c;

StringBuffer s=new StringBuffer();

s.append(f);

s.append('=');

String formula=s.toString();

char[] anArray;

anArray=new char[50];

StackCharacter mystack=new StackCharacter();

while(formula.charAt(i)!='=')

{

c=formula.charAt(i);

switch(c)

{

case '(': mystack.push(new Character(c));

i++;

break;

case ')':

while(mystack.peek().charValue()!='(')

{

anArray[j++]=mystack.pop().charValue();

}

mystack.pop();

i++;

break;

case '+':

case '-':

while(!mystack.empty()mystack.peek().charValue()!='(')

{

anArray[j++]=mystack.pop().charValue();

}

mystack.push(new Character(c));

i++;

break;

case '*':

case '/':

while(!mystack.empty()(mystack.peek().charValue()=='*'||mystack.peek().charValue()=='/'))

{

anArray[j++]=mystack.pop().charValue();

}

mystack.push(new Character(c));

i++;

break;

case' ': i++;

break;

default: while((c='0'c='9')||c=='.')

{

anArray[j++]=c;

i++;

c=formula.charAt(i);

}

anArray[j++]='#';

break;

}

}

while(!(mystack.empty()))

anArray[j++]=mystack.pop().charValue();

i=0;

int count;

double a,b,d;

StackDouble mystack1 =new StackDouble();

while(ij)

{

c=anArray[i];

switch(c)

{

case '+':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b+a;

mystack1.push(new Double(d));

i++;

break;

case '-':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b-a;

mystack1.push(new Double(d));

i++;

break;

case '*':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b*a;

mystack1.push(new Double(d));

i++;

break;

case '/':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

if(a!=0)

{

d=b/a;

mystack1.push(new Double(d));

i++;

}

else

{

System.out.println("Error!");

}

break;

default:

d=0;count=0;

while((c='0'c='9'))

{

d=10*d+c-'0';

i++;

c=anArray[i];

}

if(c=='.')

{

i++;

c=anArray[i];

while((c='0'c='9'))

{

count++;

d=d+(c-'0')/Math.pow(10,count);

i++;

c=anArray[i];

}

}

if(c=='#')

mystack1.push(new Double(d));

i++;

break;

}

}

return(mystack1.peek().doubleValue());

}

}

求一个 java 个人贷款还款计算器 的源代码，

import javax.swing.JOptionPane;

public class Pay {

public static void main(String args[]){

String loanString = JOptionPane.showInputDialog("请输入贷款本金（ loanAmout）:such as 20000.00") ;

double loanAmount= Double.parseDouble(loanString);

String dateString = JOptionPane.showInputDialog("请输入贷款期（loanDate）:between 24-60");

int loanDate = Integer.parseInt(dateString);

String monthRateString = JOptionPane.showInputDialog("请输入月利率 (MonthRate):such as 0.00005");

double monthRate = Double.parseDouble(monthRateString);

double pay_Per_Month = (loanAmount+loanAmount * loanDate * monthRate)/loanDate;

JOptionPane.showMessageDialog(null, pay_Per_Month);

}

}

Java计算器源代码

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;public class CaculatorA {

private JFrame jf;

private JButton[] jbs;

private JTextField jtf;

private JButton clear;

private double num1,num2,jieguo;

private char c;

/**

* 构造方法实例化属性

*

*/

public CaculatorA(){

jf=new JFrame("我的计算器v1.0");

jtf=new JTextField(20);

clear=new JButton("clear");

jbs=new JButton[16];

String str="123+456-789*0./=";

for(int i=0; istr.length(); i++){

jbs[i]=new JButton(str.charAt(i)+"");

}

init();

addEventHandler();

// setFont();

// setColor();

showMe();

}

/**

求个Java计算器源代码，要正确的！可以加分

我们刚好测试完 呵呵 import java.awt.BorderLayout; import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JTextArea; public class Calculater extends JFrame implements ActionListener{ JTextArea jta; JMenuBar menubar; JMenu menu; JMenuItem menuItem; JButton b0;JButton b1;JButton b2;JButton b3;JButton b4;JButton b5;JButton b6;JButton b7;JButton b8;JButton b9; JButton bAdd;JButton bMinus;JButton bMuliply;JButton bDivide;JButton bEqual;JLabel label;JButton bSQRT;JButton bClear; JButton bON;JButton bOFF;JMenuItem jHelp; String op1="",op2=""; String operation = "";//用来存储+,-,*,/操作 public Calculater(){ super("计算器"); init(); } void init(){ JMenuBar menuBar=new JMenuBar(); setJMenuBar(menuBar); menu=new JMenu("Help"); menuBar.add(menu); jHelp = new JMenuItem("帮助",new ImageIcon("image/help.gif")); menu.add(jHelp); jta = new JTextArea(1,16); Container contentPane=getContentPane(); contentPane.setLayout(new FlowLayout()); label = new JLabel(new ImageIcon("image/label.gif")); b0 =new JButton("0"); b1 =new JButton("1"); b2 =new JButton("2"); b3 =new JButton("3"); b4 =new JButton("4"); b5 =new JButton("5"); b6 =new JButton("6"); b7 =new JButton("7"); b8 =new JButton("8"); b9 =new JButton("9"); bAdd =new JButton("+"); bMinus =new JButton("-"); bMuliply =new JButton("*"); bDivide =new JButton("/"); bEqual =new JButton("="); bClear =new JButton("Clear"); (b0).addActionListener(this); (b1).addActionListener(this); (b2).addActionListener(this); (b3).addActionListener(this); (b4).addActionListener(this); (b5).addActionListener(this); (b6).addActionListener(this); (b7).addActionListener(this); (b8).addActionListener(this); (b9).addActionListener(this); (bAdd).addActionListener(this); (bMinus).addActionListener(this); (bMuliply).addActionListener(this); (bDivide).addActionListener(this); (bEqual).addActionListener(this); (bClear).addActionListener(this); (jHelp).addActionListener(this); contentPane.add(label); contentPane.add(jta); contentPane.add(b1); contentPane.add(b2); contentPane.add(b3); contentPane.add(b4); contentPane.add(b5); contentPane.add(b6); contentPane.add(b7); contentPane.add(b8); contentPane.add(b9); contentPane.add(b0); contentPane.add(bAdd); contentPane.add(bMinus); contentPane.add(bMuliply); contentPane.add(bDivide); contentPane.add(bEqual); contentPane.add(bClear); } public void actionPerformed(ActionEvent e) { if(e.getSource()==jHelp) { JDialog dialog = new JDialog(this,"****** 版权所有 *****"); dialog.setSize(250, 100); dialog.setLocation(450, 250); JLabel text = new JLabel("本计算器由 所著..."); dialog.setLayout(new BorderLayout()); dialog.add(text,"Center"); dialog.setVisible(true); } if(e.getSource()==b0) { jta.setText(jta.getText()+"0"); } if(e.getSource()==b1) { jta.setText(jta.getText()+"1"); } if(e.getSource()==b2) { jta.setText(jta.getText()+"2"); } if(e.getSource()==b3) { jta.setText(jta.getText()+'3'); } if(e.getSource()==b4) { jta.setText(jta.getText()+'4'); } if(e.getSource()==b5) { jta.setText(jta.getText()+'5'); } if(e.getSource()==b6) { jta.setText(jta.getText()+'6'); } if(e.getSource()==b7) { jta.setText(jta.getText()+'7'); } if(e.getSource()==b8) { jta.setText(jta.getText()+'8'); } if(e.getSource()==b9) { jta.setText(jta.getText()+'9'); } if(e.getSource()==bAdd) { op1 = jta.getText(); operation = "+"; jta.setText(""); label.setText("Add"); bAdd.setEnabled(false); } if(e.getSource()==bClear) { op1 = ""; operation = ""; op2 = ""; jta.setText(""); label.setText("清空"); } if(e.getSource()==bMinus) { op1 = jta.getText(); operation = "-"; jta.setText(""); label.setText("Minus"); bMinus.setEnabled(false); } if(e.getSource()==bMuliply) { op1 = jta.getText(); operation = "*"; jta.setText(""); label.setText("Muliply"); bMuliply.setEnabled(false); } if(e.getSource()==bDivide) { op1 = jta.getText(); operation = "/"; jta.setText(""); label.setText("Divide"); bDivide.setEnabled(false); } if(e.getSource()==bEqual) { bAdd.setEnabled(true); bMinus.setEnabled(true); bMuliply.setEnabled(true); bDivide.setEnabled(true); double p1=0,p2=0,result=0; op2 = jta.getText(); if(operation.equals("+")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1+p2; label.setText("和="); jta.setText(new Double(result).toString()); } if(operation.equals("-")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1-p2; label.setText("差="); jta.setText(new Double(result).toString()); } if(operation.equals("*")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1*p2; label.setText("积="); jta.setText(new Double(result).toString()); } if(operation.equals("/")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1/p2; label.setText("商="); jta.setText(new Double(result).toString()); } } } public static void main(String args[]){ Calculater c=new Calculater(); c.setLocation(400, 200); c.setSize(250,260); c.setVisible(true); } }

用JAVA编程一个房贷计算器

打了个电话给农行的客服(收费的),终于知道公式了。.好麻烦的公式...浪费了我15分钟的电话费。 还有在写公式的过程中遇到了计算x的y次方..谁知道java里怎么计算啊???我是自己写了个方法。.感觉有点麻烦... 注意的是利率.由于开始写的时候没考虑到小数点.所以这里都是按整数算..比如利率是7.5%就写成750..呵呵。. 不直到她公式给错了还是我没听清楚.好象公式有些不准。.明天我去银行问下。. import javax.swing.*; import java.awt.*; import java.awt.event.*; class MyFrame extends JFrame{ double a; double b; double c; double d; int ee; double f; double g; double m; double n; double o; double h; static double x; static int y; double z; String s1; String s2; JFrame jf=new JFrame("Counter"); // JPanel jp1=new JPanel(); JPanel jp2=new JPanel(); JPanel jp3=new JPanel(); JPanel jp4=new JPanel(); JPanel jp5=new JPanel(); JPanel jp6=new JPanel(); JPanel jp7=new JPanel(); JPanel jp8=new JPanel(); JPanel jp10=new JPanel(); JPanel jp11=new JPanel(); JPanel jp12=new JPanel(); JLabel jl1=new JLabel("计算器"); JLabel jl2=new JLabel("房屋单价(元/平):"); JLabel jl3=new JLabel("房屋面积(平方):"); JLabel jl4=new JLabel("首付金额(元):"); JLabel jl5=new JLabel("年利率(万分之):"); JLabel jl6=new JLabel("月还款额(元):"); JLabel jl7=new JLabel("总还款额(元):"); JLabel jl10=new JLabel("还款年限(年):"); JLabel jl11=new JLabel("本金(元):"); JLabel jl12=new JLabel("利息(元):"); JTextField jt1=new JTextField("",10); JTextField jt2=new JTextField("",10); JTextField jt3=new JTextField("",10); JTextField jt4=new JTextField("",10); JTextField jt5=new JTextField("0",15); JTextField jt6=new JTextField("0",15); JTextField jt10=new JTextField("",10); JTextField jt11=new JTextField("0",15); JTextField jt12=new JTextField("0",15); JButton b1=new JButton("计算"); JButton b2=new JButton("清空"); MyFrame(){ jf.setLayout(new GridLayout(10,1)); // jp1.add(jl1); // jf.add(jp1); jp2.add(jl2); jp2.add(jt1); jf.add(jp2); jp3.add(jl3); jp3.add(jt2); jf.add(jp3);

java计算器的源代码

import java.awt.*;

import java.awt.event.*;

import java.lang.*;

import javax.swing.*;

public class Counter extends Frame

{

//声明三个面板的布局

GridLayout gl1,gl2,gl3;

Panel p0,p1,p2,p3;

JTextField tf1;

TextField tf2;

Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;

StringBuffer str;//显示屏所显示的字符串

double x,y;//x和y都是运算数

int z;//Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"

static double m;//记忆的数字

public Counter()

{

gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局

gl2=new GridLayout(4,1,0,15);

gl3=new GridLayout(4,5,10,15);

tf1=new JTextField(27);//显示屏

tf1.setHorizontalAlignment(JTextField.RIGHT);

tf1.setEnabled(false);

tf1.setText("0");

tf2=new TextField(10);//显示记忆的索引值

tf2.setEditable(false);

//实例化所有按钮、设置其前景色并注册监听器

b0=new Button("Backspace");

b0.setForeground(Color.red);

b0.addActionListener(new Bt());

b1=new Button("CE");

b1.setForeground(Color.red);

b1.addActionListener(new Bt());

b2=new Button("C");

b2.setForeground(Color.red);

b2.addActionListener(new Bt());

b3=new Button("MC");

b3.setForeground(Color.red);

b3.addActionListener(new Bt());

b4=new Button("MR");

b4.setForeground(Color.red);

b4.addActionListener(new Bt());

b5=new Button("MS");

b5.setForeground(Color.red);

b5.addActionListener(new Bt());

b6=new Button("M+");

b6.setForeground(Color.red);

b6.addActionListener(new Bt());

b7=new Button("7");

b7.setForeground(Color.blue);

b7.addActionListener(new Bt());

b8=new Button("8");

b8.setForeground(Color.blue);

b8.addActionListener(new Bt());

b9=new Button("9");

b9.setForeground(Color.blue);

b9.addActionListener(new Bt());

b10=new Button("/");

b10.setForeground(Color.red);

b10.addActionListener(new Bt());

b11=new Button("sqrt");

b11.setForeground(Color.blue);

b11.addActionListener(new Bt());

b12=new Button("4");

b12.setForeground(Color.blue);

b12.addActionListener(new Bt());

b13=new Button("5");

b13.setForeground(Color.blue);

b13.addActionListener(new Bt());

b14=new Button("6");

b14.setForeground(Color.blue);

b14.addActionListener(new Bt());

b15=new Button("*");

b15.setForeground(Color.red);

b15.addActionListener(new Bt());

b16=new Button("%");

b16.setForeground(Color.blue);

b16.addActionListener(new Bt());

b17=new Button("1");

b17.setForeground(Color.blue);

b17.addActionListener(new Bt());

b18=new Button("2");

b18.setForeground(Color.blue);

b18.addActionListener(new Bt());

b19=new Button("3");

b19.setForeground(Color.blue);

b19.addActionListener(new Bt());

b20=new Button("-");

b20.setForeground(Color.red);

b20.addActionListener(new Bt());

b21=new Button("1/X");

b21.setForeground(Color.blue);

b21.addActionListener(new Bt());

b22=new Button("0");

b22.setForeground(Color.blue);

b22.addActionListener(new Bt());

b23=new Button("+/-");

b23.setForeground(Color.blue);

b23.addActionListener(new Bt());

b24=new Button(".");

b24.setForeground(Color.blue);

b24.addActionListener(new Bt());

b25=new Button("+");

b25.setForeground(Color.red);

b25.addActionListener(new Bt());

b26=new Button("=");

b26.setForeground(Color.red);

b26.addActionListener(new Bt());

//实例化四个面板

p0=new Panel();

p1=new Panel();

p2=new Panel();

p3=new Panel();

//创建一个空字符串缓冲区

str=new StringBuffer();

//添加面板p0中的组件和设置其在框架中的位置和大小

p0.add(tf1);

p0.setBounds(10,25,300,40);

//添加面板p1中的组件和设置其在框架中的位置和大小

p1.setLayout(gl1);

p1.add(tf2);

p1.add(b0);

p1.add(b1);

p1.add(b2);

p1.setBounds(10,65,300,25);

//添加面板p2中的组件并设置其的框架中的位置和大小

p2.setLayout(gl2);

p2.add(b3);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.setBounds(10,110,40,150);

//添加面板p3中的组件并设置其在框架中的位置和大小

p3.setLayout(gl3);//设置p3的布局

p3.add(b7);

p3.add(b8);

p3.add(b9);

p3.add(b10);

p3.add(b11);

p3.add(b12);

p3.add(b13);

p3.add(b14);

p3.add(b15);

p3.add(b16);

p3.add(b17);

p3.add(b18);

p3.add(b19);

p3.add(b20);

p3.add(b21);

p3.add(b22);

p3.add(b23);

p3.add(b24);

p3.add(b25);

p3.add(b26);

p3.setBounds(60,110,250,150);

//设置框架中的布局为空布局并添加4个面板

setLayout(null);

add(p0);

add(p1);

add(p2);

add(p3);

setResizable(false);//禁止调整框架的大小

//匿名类关闭窗口

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e1)

{

System.exit(0);

}

});

setBackground(Color.lightGray);

setBounds(100,100,320,280);

setVisible(true);

}

//构造监听器

class Bt implements ActionListener

{

public void actionPerformed(ActionEvent e2)

{

try{

if(e2.getSource()==b1)//选择"CE"清零

{

tf1.setText("0");//把显示屏清零

str.setLength(0);//清空字符串缓冲区以准备接收新的输入运算数

}

else if(e2.getSource()==b2)//选择"C"清零

{

tf1.setText("0");//把显示屏清零

str.setLength(0);

}

else if(e2.getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText(""+(-x));

}

else if(e2.getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);//清空缓冲区以便接收新的另一个运算数

y=0d;

z=0;

}

else if(e2.getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=1;

}

else if(e2.getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=2;

}

else if(e2.getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=3;

}

else if(e2.getSource()==b26)//单击等号按钮输出计算结果

{

str.setLength(0);

switch(z)

{

case 0 : tf1.setText(""+(x+y));break;

case 1 : tf1.setText(""+(x-y));break;

case 2 : tf1.setText(""+(x*y));break;

case 3 : tf1.setText(""+(x/y));break;

}

}

else if(e2.getSource()==b24)//单击"."按钮输入小数

{

if(tf1.getText().trim().indexOf(′.′)!=-1)//判断字符串中是否已经包含了小数点

{

}

else//如果没数点有小

{

if(tf1.getText().trim().equals("0"))//如果初时显示为0

{

str.setLength(0);

tf1.setText((str.append("0"+e2.getActionCommand())).toString());

}

else if(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作

{

}

else

{

tf1.setText(str.append(e2.getActionCommand()).toString());

}

}

y=0d;

}

else if(e2.getSource()==b11)//求平方根

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText("数字格式异常");

if(x0)

tf1.setText("负数没有平方根");

else

tf1.setText(""+Math.sqrt(x));

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b16)//单击了"%"按钮

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText(""+(0.01*x));

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b21)//单击了"1/X"按钮

{

x=Double.parseDouble(tf1.getText().trim());

if(x==0)

{

tf1.setText("除数不能为零");

}

else

{

tf1.setText(""+(1/x));

}

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b3)//MC为清除内存

{

m=0d;

tf2.setText("");

str.setLength(0);

}

else if(e2.getSource()==b4)//MR为重新调用存储的数据

{

if(tf2.getText().trim()!="")//有记忆数字

{

tf1.setText(""+m);

}

}

else if(e2.getSource()==b5)//MS为存储显示的数据

{

m=Double.parseDouble(tf1.getText().trim());

tf2.setText("M");

tf1.setText("0");

str.setLength(0);

}

else if(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR

{

m=m+Double.parseDouble(tf1.getText().trim());

}

else//选择的是其他的按钮

{

if(e2.getSource()==b22)//如果选择的是"0"这个数字键

{

if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作

{

}

else

{

tf1.setText(str.append(e2.getActionCommand()).toString());

y=Double.parseDouble(tf1.getText().trim());

}

}

else if(e2.getSource()==b0)//选择的是“BackSpace”按钮

{

if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零

{

if(str.length()!=1)

{

tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常

}

else

{

tf1.setText("0");

str.setLength(0);

}

}

y=Double.parseDouble(tf1.getText().trim());

}

else//其他的数字键

{

tf1.setText(str.append(e2.getActionCommand()).toString());

y=Double.parseDouble(tf1.getText().trim());

}

}

}

catch(NumberFormatException e){

tf1.setText("数字格式异常");

}

catch(StringIndexOutOfBoundsException e){

tf1.setText("字符串索引越界");

}

}

}

public static void main(String args[])

{

new Counter();