通过Frame窗口实现简单的加法运算-蒲公英云

通过Frame窗口实现简单的加法运算

桃扇骨 2022-05-09 10:38 200阅读 0赞

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
    }
}