Question

帮忙修改JAVA程序(简单的`)

import java.awt.*;
import java.awt.event.*;
public class MyText extends Frame
{
public static void main(String[] args)
{
MyText f=new MyText();
TextField tf=new TextField();
Panel p=new Panel();
Button b=new Button("大家好！");
b.addActionListener(new ButtonHandler());

f.setTitle("MyText");
f.add(p,BorderLayout.CENTER);
p.add(tf,BorderLayout.NORTH);
p.add(b,BorderLayout.SOUTH);

f.setSize(300,100);
p.add(b);
p.add(tf);
f.add(p);

f.pack();
f.show();
}
}
class ButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
System.out.println(e.getActionCommand());
}
}
我想把点击按钮的内容输出到文本域中诶``但是不晓得哪里出问题了`大家帮下忙了``

Answer 1

import java.awt.*;
import java.awt.event.*;
public class MyText extends Frame
{
TextField tf=new TextField(20);
Panel p=new Panel();
Button b=new Button("大家好！");
public MyText()
{
b.addActionListener(new ButtonHandler());
this.setLayout(new BorderLayout());
add(p,BorderLayout.CENTER);
p.add(tf,BorderLayout.NORTH);
p.add(b,BorderLayout.SOUTH);
p.add(b);
p.add(tf);
add(p);

}

public static void main(String[] args)
{
MyText f=new MyText();
f.setTitle("MyText");
f.setSize(300,100);
//f.pack();//这个意思是自动大小 这样你上面设置的SIZE就没用了就会很小
f.show();

}
class ButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
tf.setText(e.getActionCommand());
System.out.println(e.getActionCommand());
}
}
}