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UseItemEvent.java

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import java.awt.*;

import java.awt.event.*;

import java.applet.*;

import java.applet.Applet;

public class UseItemEvent extends Applet implements ItemListener

{

Checkbox cDisp;

Button btnDisp;

Choice cFont;

public void init()

{

cDisp = new Checkbox("红色");

btnDisp = new Button("颜色显示");

cFont = new Choice();

cFont.add("10");

cFont.add("12");

cFont.add("14");

// 添加事件

cDisp.addItemListener(this);

cFont.addItemListener(this);

add(cDisp);

add(cFont);

add(btnDisp);

}

// 接口事件

public void itemStateChanged(ItemEvent e)

{

Checkbox temp;

Choice temp2;

Font oldF;

// 复选框

if (e.getItemSelectable() instanceof Checkbox)

{

temp = (Checkbox)(e.getItemSelectable());

// 选中为红色, 否则为蓝色

if (temp.getState())

btnDisp.setBackground(Color.red);

else

btnDisp.setBackground(Color.blue);

}

// 组合框

if (e.getItemSelectable() instanceof Choice)

{

oldF = btnDisp.getFont();

temp2 = (Choice)(e.getItemSelectable());

String s = temp2.getSelectedItem();

// 设置字体

btnDisp.setFont(new Font(oldF.getName(), oldF.getStyle(), Integer.parseInt(s)));

}

}

}