import .*;
import .*;
public class TestMath {
public static void main(String[] args) {
MyFrame9 f = new MyFrame9();
();
}
}
class MyFrame9 extends Frame {
TextField tf1,tf2,tf3;
public void MyMath() {
tf1 = new TextField("10");
tf2 = new TextField("10");
tf3 = new TextField("20");
Label label1 = new Label("+");
Button b1 = new Button("=");
(new MyMonitor(tf1,tf2,tf3));
setLayout(new FlowLayout());
add(tf1);
add(label1);
add(tf2);
add(b1);
add(tf3);
pack();
setVisible(true);
}
}
class MyMonitor implements ActionListener {
TextField tf1,tf2,tf3;
MyMonitor(TextField tf1,TextField tf2,TextField tf3) {
this.tf1 = tf1;
this.tf2 = tf2;
this.tf3 = tf3;
}
public void actionPerformed(ActionEvent e) {
int n1 = (());
int n2 = (());
(""+(n1+n2));
}
}
再在源程序上修改为：持有对方引用
import .*;
import .*;
public class TestMath {
public static void main(String[] args) {
MyFrame9 f = new MyFrame9();
();
}
}
class MyFrame9 extends Frame {
TextField tf1,tf2,tf3;
public void MyMath() {
tf1 = new TextField("10");
tf2 = new TextField("10");
tf3 = new TextField("20");
Label label1 = new Label("+");
Button b1 = new Button("=");
(new MyMonitor(this));
setLayout(new FlowLayout());
add(tf1);
add(label1);
add(tf2);
add(b1);
add(tf3);
pack();
setVisible(true);
}
}
class MyMonitor implements ActionListener {
MyFrame9 mf = null;
MyMonitor(MyFrame9 mf) {
= mf;
}
public void actionPerformed(ActionEvent e) {
int n1 = (mf.());
int n2 = (mf.());
mf.(""+(n1+n2));
}
}