Java实现的一个加法器

最新推荐文章于 2021-02-17 02:23:10 发布

lasolmi

最新推荐文章于 2021-02-17 02:23:10 发布

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分类专栏： java

本文链接：https://blog.youkuaiyun.com/lasolmi/article/details/40298901

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import java.awt.*;
import java.awt.event.*;
public class TFMath {
	public static void main(String[] args) {
		new TFFrame().launchFrame();
	}
}
class TFFrame extends Frame {
	TextField[] num = new TextField[3];
	public void launchFrame() {
		for(int i=0;i<3;i++) 
			num[i] = new TextField(10);
			Label lblPlus = new Label("+");
			Button btnEqual = new Button("=");
			btnEqual.addActionListener(new MyMonitor(this));
			setLayout(new FlowLayout());
			add(num[0]); add(lblPlus);
			add(num[1]); add(btnEqual);
			add(num[2]);
			pack();
			setVisible(true);
	}
}
class MyMonitor implements ActionListener {
	TFFrame tf = null;
	public MyMonitor(TFFrame tf) {this.tf = tf;}
	public void actionPerformed(ActionEvent e) {
		int n0 = Integer.parseInt(tf.num[0].getText());
		int n1 = Integer.parseInt(tf.num[1].getText());
		tf.num[2].setText(""+(n0+n1));
	}
}

下面这个是内部类版本：

import java.awt.*;
import java.awt.event.*;
public class TFMath {
	public static void main(String[] args) {
		new TFFrame().launchFrame();
	}
}
class TFFrame extends Frame {
	TextField[] num = new TextField[3];
	public void launchFrame() {
		for(int i=0;i<3;i++) 
			num[i] = new TextField(10);
			Label lblPlus = new Label("+");
			Button btnEqual = new Button("=");
			btnEqual.addActionListener(new MyMonitor());
			setLayout(new FlowLayout());
			add(num[0]); add(lblPlus);
			add(num[1]); add(btnEqual);
			add(num[2]);
			pack();
			setVisible(true);
	}
	class MyMonitor implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			int n0 = Integer.parseInt(num[0].getText());
			int n1 = Integer.parseInt(num[1].getText());
			num[2].setText(""+(n0+n1));
		}
	}
}