getdouble.java

来自「有大量的java的实例」· Java 代码 · 共 30 行

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

public class getDouble extends Applet implements ActionListener
{
	Label prompt;
	TextField input;
	double d = 0.0;

		public void init()
		{
			prompt = new Label("请输入一个浮点数：");
			input = new TextField(10);
			add(prompt);
			add(input);
			input.addActionListener(this);
		}
		public void paint(Graphics g)
		{
			g.drawString("你输入了数据：" + d,10,50);
		}
		public void actionPerformed(ActionEvent e)
		{
	//		d = Double.valueOf(input.getText()).doubleValue();
	 		d = Double.parseDouble(input.getText());
			repaint();
		}
}