使用文本框+按钮+awt，做加法器

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我们可以用文本框来存数值，点击“”=“”在最后的文本框中打印结果，那么一定是给等号按钮设置监听，

那么我们怎么将其他文本框中的值，传递过来呢。最笨的方法是用到什么就传递进去什么（在new监听器的时候）。当然不如直接的将整个this本身传递进去好了。

package awt;import java.awt.*;public class graphy  {public static void  main(String[] args){new TFframe().launchFrame();}}package awt;import java.awt.*;import java.awt.event.*;public class TFframe extends Frame {TextField num1,num2,num3;public void launchFrame(){num1 = new TextField(20);num2= new TextField(20);num3 = new TextField(20);Label Plus = new Label("+");Button equals = new Button("=");setLayout(new FlowLayout());add(num1);add(Plus);add(num2);add(num2);add(equals);add(num3);//equals.addActionListener(new Monitor(num1,num2,num3));equals.addActionListener(new Monitor(this));setVisible(true);pack();}}package awt;import java.awt.*;import java.awt.event.*;public class Monitor implements ActionListener{/*TextField num1,num2,num3; Monitor(TextField nu1,TextField nu2,TextField nu3){this.num1 = nu1;this.num2 = nu2;this.num3 = nu3;}*/ TFframe tf = null;public Monitor(TFframe tf){this.tf = tf;}public void actionPerformed(ActionEvent e){//System.out.println("heihie");//int n1 = Integer.parseInt(num1.getText());//int n2 = Integer.parseInt(num2.getText());//num3.setText(String.valueOf((n1+n2)));int n1 = Integer.parseInt(tf.num1.getText());int n2 = Integer.parseInt(tf.num2.getText());tf.num3.setText(String.valueOf((n1+n2))); }}

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