通过Frame窗口实现简单的加法运算

桃扇骨 2022-05-09 10:38 165阅读 0赞

![70][]

方法一：（比较繁）

package GUI;
    /*通过Frame窗口实现简单的加法运算*/
    import java.awt.*;
    import java.awt.event.*;
    public class TFMath {
    
    	public static void main(String[] args) {
    		new TFFrame().lanunFrame();
    
    	}
    
    }
    
    class TFFrame extends Frame {
    	public void lanunFrame() {
    		TextField num1 = new TextField(10);
    		TextField num2 = new TextField(10);
    		TextField num3 = new TextField(15);
    		Label lbplus = new Label("+");
    		Button btnEqual = new Button("=");
    		btnEqual.addActionListener(new MyMonitor(num1, num2, num3));
    		setLayout(new FlowLayout());
    		add(num1);
    		add(lbplus);
    		add(num2);
    		add(btnEqual);
    		add(num3);
    		pack();
    		setVisible(true);	
    	}
    }
    
    class MyMonitor implements ActionListener {
    	TextField num1, num2, num3;
    	public MyMonitor(TextField num1, TextField num2, TextField num3) {
    		this.num1 = num1;
    		this.num2 = num2;
    		this.num3 = num3;
    	}
    	public void actionPerformed(ActionEvent e) {
    		int n1 = Integer.parseInt(num1.getText());//转成整型计算
    		int n2 = Integer.parseInt(num2.getText());
    		num3.setText("" + (n1 + n2));//再将num3转成字符型
    		
    	}
    }

方法二：（持有对方的引用）

package GUI;
    /*通过Frame窗口实现简单的加法运算--持有对方的引用*/
    import java.awt.*;
    import java.awt.event.*;
    public class TFMath {
    
    	public static void main(String[] args) {
    		new TFFrame().lanunFrame();
    
    	}
    
    }
    
    class TFFrame extends Frame {
    	TextField num1, num2, num3;
    	public void lanunFrame() {
    		num1 = new TextField(10);
    		num2 = new TextField(10);
    		num3 = new TextField(15);
    		Label lbplus = new Label("+");
    		Button btnEqual = new Button("=");
    		btnEqual.addActionListener(new MyMonitor(this));
    		setLayout(new FlowLayout());
    		add(num1);
    		add(lbplus);
    		add(num2);
    		add(btnEqual);
    		add(num3);
    		pack();
    		setVisible(true);	
    	}
    }
    
    class MyMonitor implements ActionListener {
    //	TextField num1, num2, num3;
    //	public MyMonitor(TextField num1, TextField num2, TextField num3) {
    //		this.num1 = num1;
    //		this.num2 = num2;
    //		this.num3 = num3;
    //	}
    	TFFrame tf = null;
    	public MyMonitor(TFFrame tf) { //持有对方的引用
    		this.tf = tf;
    	}
    	public void actionPerformed(ActionEvent e) {
    		int n1 = Integer.parseInt(tf.num1.getText());//转成整型计算
    		int n2 = Integer.parseInt(tf.num2.getText());
    		tf.num3.setText("" + (n1 + n2));//再将num3转成字符型
    		
    	}
    }

[70]: /images/20220509/d3bbc78016d24b63ac5686c21b16095e.png