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helloworld

jcghq

发贴: 0
积分: 0

于 2003-01-07 12:53

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class HelloWorld extends Applet implements ActionListener
{
private Button myButton1=null;
private Button myButton2=null;
private Button myButton3=null;
private Label lHello=null;
private Label lAnswer=null;

public void actionPerformed(ActionEvent e)
{
if((e.getSource()==newButton1()))
{
showHello(e);
}
if((e.getSource()==newButton2()))
{
showWhoAreU(e);
}
if((e.getSource()==newButton3()))
{
showReset(e);
}
}

private void showHello(ActionEvent arg)
{
try
{
newlHello().setText("Hello,World!");
}
catch(Throwable myExc)
{
handleException(myExc);
}
}
private void showWhoAreU(ActionEvent arg)
{
try
{
newlAnswer().setText("I am Java! and Who are you?");
}
catch(Throwable myExc)
{
handleException(myExc);
}
}

private void showReset(ActionEvent arg)
{
try
{
newlAnswer().setText("");
newlHello().setText("");
}
catch(Throwable myExc)
{
handleException(myExc);
}
}

private Button newButton1()
{
if(myButton1==null)
{
try
{
myButton1=new Button();
myButton1.setName("Button1");
myButton1.setFont(new Font("dialog",3,16));
myButton1.setBounds(59,228,111,31);
myButton1.setLabel("Hello");
}
catch(Throwable myExc)
{
handleException(myExc);
}
};
return myButton1;
}

private Button newButton2()
{
if(myButton2==null)
{
try
{
myButton2=new Button();
myButton2.setName("Button2");
myButton2.setFont(new Font("dialog",3,16));
myButton2.setBounds(229,227,120,32);
myButton2.setLabel("Who are you?");
}
catch(java.lang.Throwable myExc)
{
handleException(myExc);
}
};
return myButton2;
}

private Button newButton3()
{
if(myButton3==null)
{
try
{
myButton3=new Button();
myButton3.setName("Button3");
myButton3.setFont(new Font("helvetica",3,16));
myButton3.setBounds(408,228,90,30);
myButton3.setLabel("Reset");
}
catch(java.lang.Throwable myExc)
{
handleException(myExc);
}
};
return myButton3;
}

private Label newlHello()
{
if(lHello==null)
{
try
{
lHello=new Label();
lHello.setName("hello");
lHello.setText("");
lHello.setForeground(Color.blue);
lHello.setFont(new Font("helvetica",3,24));
lHello.setAlignment(Label.LEFT);
lHello.setBounds(108,40,200,30);
lHello.setEnabled(true);
}
catch(Throwable myExc)
{
handleException(myExc);
}
};
return lHello;
}

private Label newlAnswer()
{
if(lAnswer==null)
{
try
{
lAnswer=new Label();
lAnswer.setName("");
lAnswer.setFont(new Font("helvetica",3,32));
lAnswer.setAlignment(Label.LEFT);
lAnswer.setText("");
lAnswer.setBounds(108,118,550,76);
lAnswer.setForeground(Color.blue);
}
catch(Throwable myExc)
{
handleException(myExc);
}
};
return lAnswer;
}

private void handleException(Throwable excption)
{
}

private void initListener()
{
newButton1().addActionListener(this);
newButton2().addActionListener(this);
newButton3().addActionListener(this);
}

public void init()
{
try
{
setName("HelloWorld");
setLayout(null);
setSize(560,265);
add(newButton1(),newButton1().getName());
add(newButton2(),newButton2().getName());
add(newlHello(),newlHello().getName());
add(newlAnswer(),newlAnswer().getName());
add(newButton3(),newButton3().getName());
initListener();
}
catch(Throwable myExc)
{
handleException(myExc);
}
}
}

<HTML>
<HEAD>
<TITLE>
Hello World Applet
</TITLE>
</HEAD>
<BODY>
<H2>This is a Java Applet Example.</H2>
<H3>Press button "Hello" and the Applet reply to you</H3>
<H3>Press button "Who are you?" the Applet tell you who it is</H3>
<H3>and press button "Reset" will clear all these messgae on the window.</H3>
<APPLET code=HelloWorld.class width=650 height=350>
</APPLET>
<HR>
<A href="HelloWorld.java">View the source.</A>
</BODY>
</HTML>

dapan edited on 2003-01-08 16:25

作者	Re:helloworld [Re:jcghq]
mabinde 发贴: 0 积分: 0	于 2003-01-08 15:16 easy

作者	Re:helloworld [Re:jcghq]
palatum CJSDN高级会员发贴: 451 积分: 80	于 2003-01-08 16:23 贴这个东西的目的是什么？请说明一下。我好进行评估。

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