choicetest.java

java课程的资料以及实验的代码

/**步骤：
  * 1. Applet
  * 2. 加监听器
  * 3. paint输入日期
  * 4. list中选择颜色、改编字符颜色
  */
  
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;

public class ChoiceTest extends Applet implements ItemListener
{
	Choice c;
	Color color;
	
	public void init()
	{
		c = new Choice();		//时间源
		c.addItemListener(this);//加监听者
		c.addItem("red");
		c.addItem("green");
		c.addItem("blue");
		
		//在容器Applet中加控件
		add(c);
	}
	
	public void itemStateChanged(ItemEvent e)
	{
		System.out.println("aaaa");
		if ((c.getSelectedItem()).equals("red"))
		{
			color = Color.red;
		}
		else if ((c.getSelectedItem()).equals("green"))
		{
			color = Color.green;
		}
		else //if ((c.getSelectedItem()).equals("blue"))
		{
			color = Color.blue;
		}
		repaint();
	}
	
	public void paint(Graphics g)
	{
		g.setColor(color);
		g.drawString((new Date()).toString(),100,100);
		
	}
}