Java学习笔记（AWT组件 之 按钮）

没什么说的，就是当按钮被按下后，会产生ActionEvent 事件，需要用 ActionListener 接口进行监听和处理事件。

下面是一个菜数字大小的游戏

package frame;
import java.awt.event.*;
import java.awt.*;

class WindowButton extends Frame implements ActionListener{
	int number;
	Label  prompt = new Label("提示条");
	TextField inputs = new TextField("输入框");
	Button buttonGetNumber, buttonEnter;
	WindowButton(String str){
		super(str);
		setLayout(new FlowLayout());
		buttonGetNumber = new Button(" 得到一个随机数");
		add(buttonGetNumber);
		prompt = new Label(" 输入你行猜的数字", Label.CENTER);
		prompt.setBackground(Color.cyan);
		inputs = new TextField("0",10);
		add(prompt);
		add(inputs);
		buttonEnter = new Button("确定");
		add(buttonEnter);
		buttonEnter.addActionListener(this);
		buttonGetNumber.addActionListener(this);
		setBounds(100, 100, 150, 150);
		setVisible(true);
		validate();
	}
	
	public void actionPerformed(ActionEvent e) {
		if(e.getSource() == buttonGetNumber){
			number = (int) (Math.random() * 100) + 1;
			prompt.setText("输入你的猜测");
		}else if(e.getSource() == buttonEnter){
			int guess = 0;
			try{
				guess = Integer.parseInt(inputs.getText());
				if(guess == number){
					prompt.setText("你才对了");
				}else if(guess > number){
					prompt.setText("你猜小了");
				}else if(guess < number){
					prompt.setText(" 你才打了");
				}
			}catch (NumberFormatException event){
				prompt.setText("请输入数字");
			}
		}
	}
}	
public class Fra{
	public static void main(String ars[]){
		WindowButton win = new WindowButton("窗口");
	}
}