一个AWT事件处理小程序,效果没得到
源程序如下:
import java.awt.*;
import java.awt.event.*;
public class Test1 implements ActionListener {
Frame f;
Button b;
TextField tf;
public void creat() {
f = new Frame("testing");
b = new Button("press");
b.addActionListener(this);
f.add(b,"North");
tf = new TextField();
f.add(tf,"South");
f.setSize(200,200);
f.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
tf.setText("the Button is pressed"); // 这一句 点击Button没有打印
}
public static void main(String args[]) {
Test t = new Test();
t.creat();
}
}
点击press按钮怎么没有显示哦"the Button is pressed"