java多線程的實例
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.event.*;
public class ThreadDemo extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public ThreadDemo() {
JButton btn = new JButton("Click me");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread thread1 = new Thread(new Runnable() {
public void run() {
Graphics g = getGraphics();
for (int i = 10; i < 300; i += 10) {
try {
Thread.sleep(100);
g.drawOval(i, 100, 10, 10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
Thread thread2 = new Thread(new Runnable() {
public void run() {
Graphics g = getGraphics();
for (int i = 10; i < 300; i += 10) {
try {
Thread.sleep(500);
g.drawOval(i, 150, 15, 15);
g.draw3DRect(i, i, i, i, true);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
thread1.start();
thread2.start();
}
});
getContentPane().add(btn, BorderLayout.NORTH);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(320, 200);
setVisible(true);
}
public static void main(String[] args) {
new ThreadDemo();
}
}
相关文档：
public class TestClass{
public static void main(String args[]){
VarArgs(1, "one");
VarArgs(2, "one", "two");
VarArgs(3, "one", "two", "three");
VarArgs(0); // Attention!
}
static void VarArgs(int nRequired, String... trailing){
System.out.print("Required: " + nRequired + " ");
......
1、语法：必须比较熟悉，在写代码的时候IDE的编辑器对某一行报错应该能够根据报错信息知道是什么样的语法错误并且知道任何修正。
2、命令：必须熟悉JDK带的一些常用命令及其常用选项，命令至少需要熟悉：appletviewer、 HtmlConverter、jar、 java、javac、javadoc、javap、javaw、native2ascii ......
import java.util.Enumeration;
public class CipherTest implements Enumeration {
private int N;
private int c[], k;
private Object[] objs;
public CipherTest(Object[] items) {
N = items.length;
c = new int[N + 1];
for (int i = 0; i <= N; i++)
c[i] = i;
objs = items;
k = 1 ......
package Sets;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
/**
* java集合操作
*
......
