一些Java例子

dooluby — Fri, 14 Jul 2006 05:00:00 GMT

1、从1加到100
public class addsum
{
public static void main(String[] args)
{
    int i=1,sum=0;
    for(;i<101;i++)
      sum+=i;
    System.out.print(sum);
}
}
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2、输出菱形
//设计一程序，打印菱形
public class ling
{
public static void main(String[] args)
{
    System.out.println("开始打印菱形：\n");
    int i=1,j=1,k=0;
    int iMax=13;//最大一行等于9
    //第一行等于1 需要补空格数等于 iMax-1/2
    for(;i<=iMax;i=i+2)
    {
      System.out.print("              ");
      for(j=1;j<=((iMax-1)/2-k);j++)
        System.out.print(" ");
      for(j=0;j        System.out.print("*");
      System.out.println("\n");
      k++;
    }
    i=iMax-2;
    k=0;
    for(;i>0;i=i-2)
    {
      System.out.print("              ");
      k++;
      for(j=1;j<=k;j++)
        System.out.print(" ");
      for(j=0;j        System.out.print("*");
      System.out.println("\n");
    }
    System.out.println("\n菱形输出完毕。");
}
}
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用AWT写的一个简单的Applet
//:Button2New.java
//Capturing button presses
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class Button2New extends Applet
{
Button
b1=new Button("yeqiufeng"),
b2=new Button("qfkx");
public void init()
{
    b1.addActionListener(new B1());
    b2.addActionListener(new B2());
    add(b1);
    add(b2);
}

class B1 implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
      getAppletContext().showStatus("Button 1");
    }
}

class B2 implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
      getAppletContext().showStatus("Button 2");
    }
}
}
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用新的事件模型写的按钮：
//:Button2New.java
//Capturing button presses
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Button2New extends Applet
{
Button
b1=new Button("邓东亚"),
b2=new Button("李闯");
public void init()
{
    b1.addActionListener(new B1());
    b2.addActionListener(new B2());
    add(b1);
    add(b2);
}

class B1 implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
      getAppletContext().showStatus("Button 1");
    }
}

class B2 implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
      getAppletContext().showStatus("Button 2");
    }
}
}
编译成功后用Dreamweaver把class插入到网页中调整一下外观大小用浏览器打开就可以啦
如果Applet可以读取XML 我会把我的网站……哼哼……
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今天的练习是网络编程
先用以下示例来了解一下网络编程
import java.net.*;
public class WhoAmi
{
public static void main(String[] args) throws Exception
{
    if(args.length!=1)
    {
      System.err.println("Usage:WhoAmi MachineName");
      System.exit(1);
    }
    InetAddress a=InetAddress.getByName(args[0]);
    System.out.println(a);
}
}

dooluby 2006-07-14 13:00 发表评论

BlogJava-二进制狂想曲-文章分类-Java

一些Java例子