import?java.awt.*;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
public?class?TPlus?{
public?static?void?main(String[]?args)?{
new?TFFrame();
}
}
class?TFFrame?extends?Frame{
TextField?num1,num2,num3;
public?TFFrame(){
num1?=new?TextField(10);
num2?=new?TextField(10);
num3?=new?TextField(15);
Label?lblplus?=new?Label("+");
Button?equ?=new?Button("=");
equ.addActionListener(new?MyMonitor(this));
setLayout?(new?FlowLayout());
add(num1);
add(lblplus);
add(num2);
add(equ);
add(num3);
pack();
setVisible(true);
}
}
class?MyMonitor?implements?ActionListener{
TFFrame?tf=null;//！?。?！好方法獲得另一個類的東西之和那個對象打交道
public?MyMonitor(TFFrame?tf){
this.tf=tf;
}
public?void?actionPerformed(ActionEvent?e)?{
int?n1=Integer.parseInt(tf.num1.getText());
int?n2=Integer.parseInt(tf.num2.getText());
tf.num3.setText(String.valueOf(n1+n2));
}
}我只想實現一個很簡單的加法計算器，以上程序能夠正確實現，但為啥我把哪一行改成TFFrame?tf=new?TFFrame?();
//就報錯Exception?in?thread?"main"?java.lang.StackOverflowError
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