java代码最佳实例,java开发实例

请问谁有java编程实例，简单就好

import java.awt.*;

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import java.awt.event.*;

public class MyFrame

{

private Frame f;

private String name[]={"1","2","3","4","5","6","7"} ;

private Button Button[]= new Button[name.length];

private TextField tf;

private Panel p;

private int count = 0;

public void setup()

{

f = new Frame("计算器");

tf = new TextField(40);

p = new Panel();

p.setLayout(new GridLayout(4,6,5,5));

for(int i=0;iname.length;i++)

{

Button[i]= new Button(name[i]);

p.add(Button[i]);

}

f.add(tf,BorderLayout.NORTH);

f.add(p,BorderLayout.SOUTH);

f.addWindowListener(new MyWindowListener());

f.pack();

f.setResizable(false);//锁定大小 或者定义一个ScrollPane对象 将panel先装入Scrollpane再将Scroll装入Frame

f.show();

}

public static void main(String[] args)

{

MyFrame mf = new MyFrame();

mf.setup();

}

class MyWindowListener extends WindowAdapter

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

}

求一个JAVA多线程例子，最好有代码，谢谢啦！

package a.b.test;

import java.util.Date;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;

public class Calculate1000 implements CallableInteger{

public Calculate1000(){}

public Calculate1000(int a, int b){

this.a = a;

this.b = b;

}

int a;

int b;

/**

* @param args

* @throws Exception

*/

public static void main(String[] args) throws Exception {

//同步

Calculate1000 ca1 = new Calculate1000();

Date ds1 = new Date();

int result = 0;

for(int i = 1 ; i = 1000 ; i++){

result = ca1.add(i, result);

}

System.out.println(result);

System.out.println("同步用时" + (new Date().getTime() - ds1.getTime()) + "MS");

//异步

Date ds2 = new Date();

result = 0;

ExecutorService es = Executors.newFixedThreadPool(2);

FutureInteger future1 = es.submit(new Calculate1000(1,500));

FutureInteger future2 = es.submit(new Calculate1000(501,1000));

result = future1.get() + future2.get();

System.out.println(result);

System.out.println("异步用时" + (new Date().getTime() - ds2.getTime()) + "MS");

es.shutdown();

}

private int add(int a, int b) throws Exception{

Thread.sleep(10);

return a + b;

}

@Override

public Integer call() throws Exception {

int res = 0;

for(int i = a ; i = b ; i++){

res = this.add(res, i);

}

return res;

}

}

楼主你试一下这段代码行不行，行的话请采纳！

java图片加水印代码 最好有实例！！！先谢了！！

文字水印

import java.awt.*;

import java.awt.image.*;

import java.io.*;

import javax.swing.*;

import com.sun.image.codec.jpeg.*;

public class WaterSet {

/**

* 给图片添加水印

*

* @param filePath

* 需要添加水印的图片的路径

* @param markContent

* 水印的文字

* @param markContentColor

* 水印文字的颜色

* @param qualNum

* 图片质量

* @return

*/

public boolean createMark(String filePath, String markContent,

Color markContentColor, float qualNum) {

ImageIcon imgIcon = new ImageIcon(filePath);

Image theImg = imgIcon.getImage();

int width = theImg.getWidth(null);

int height = theImg.getHeight(null);

BufferedImage bimage = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = bimage.createGraphics();

g.setColor(markContentColor);

g.setBackground(Color.white);

g.drawImage(theImg, 0, 0, null);

g.drawString(markContent, width / 5, height / 5); // 添加水印的文字和设置水印文字出现的内容

g.dispose();

try {

FileOutputStream out = new FileOutputStream(filePath);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);

param.setQuality(qualNum, true);

encoder.encode(bimage, param);

out.close();

} catch (Exception e) {

return false;

}

return true;

}

}

图片水印

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileOutputStream;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

public final class ImageUtils {

public ImageUtils() {

}

/*

* public final static String getPressImgPath() { return ApplicationContext

* .getRealPath("/template/data/util/shuiyin.gif"); }

*/

/**

* 把图片印刷到图片上

*

* @param pressImg --

* 水印文件

* @param targetImg --

* 目标文件

* @param x

* --x坐标

* @param y

* --y坐标

*/

public final static void pressImage(String pressImg, String targetImg,

int x, int y) {

try {

//目标文件

File _file = new File(targetImg);

Image src = ImageIO.read(_file);

int wideth = src.getWidth(null);

int height = src.getHeight(null);

BufferedImage image = new BufferedImage(wideth, height,

BufferedImage.TYPE_INT_RGB);

Graphics g = image.createGraphics();

g.drawImage(src, 0, 0, wideth, height, null);

//水印文件

File _filebiao = new File(pressImg);

Image src_biao = ImageIO.read(_filebiao);

int wideth_biao = src_biao.getWidth(null);

int height_biao = src_biao.getHeight(null);

g.drawImage(src_biao, (wideth - wideth_biao) / 2,

(height - height_biao) / 2, wideth_biao, height_biao, null);

//水印文件结束

g.dispose();

FileOutputStream out = new FileOutputStream(targetImg);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(image);

out.close();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 打印文字水印图片

*

* @param pressText

* --文字

* @param targetImg --

* 目标图片

* @param fontName --

* 字体名

* @param fontStyle --

* 字体样式

* @param color --

* 字体颜色

* @param fontSize --

* 字体大小

* @param x --

* 偏移量

* @param y

*/

public static void pressText(String pressText, String targetImg,

String fontName, int fontStyle, int color, int fontSize, int x,

int y) {

try {

File _file = new File(targetImg);

Image src = ImageIO.read(_file);

int wideth = src.getWidth(null);

int height = src.getHeight(null);

BufferedImage image = new BufferedImage(wideth, height,

BufferedImage.TYPE_INT_RGB);

Graphics g = image.createGraphics();

g.drawImage(src, 0, 0, wideth, height, null);

// String s="";

g.setColor(Color.RED);

g.setFont(new Font(fontName, fontStyle, fontSize));

g.drawString(pressText, wideth - fontSize - x, height - fontSize

/ 2 - y);

g.dispose();

FileOutputStream out = new FileOutputStream(targetImg);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(image);

out.close();

} catch (Exception e) {

System.out.println(e);

}

}

public static void main(String[] args) {

pressImage("F:/logo.png", "F:/123.jpg", 0, 0);

}

}