import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestButton { public static void main(String[] args) {
ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(150,100);
frame.setResizable(false);
frame.setVisible(true);
}}class ButtonFrame extends JFrame{
public ButtonFrame(){
setTitle("test button");
ButtonPanel panel = new ButtonPanel();
add(panel);
//pack();
}
}class ButtonPanel extends JPanel{
public ButtonPanel(){
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2,1));
panel.add(new JButton("1"));
panel.add(new JButton("2"));//添加的button怎么不显示?
}
}
import java.awt.event.*;
import javax.swing.*;
public class TestButton { public static void main(String[] args) {
ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(150,100);
frame.setResizable(false);
frame.setVisible(true);
}}class ButtonFrame extends JFrame{
public ButtonFrame(){
setTitle("test button");
ButtonPanel panel = new ButtonPanel();
add(panel);
//pack();
}
}class ButtonPanel extends JPanel{
public ButtonPanel(){
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2,1));
panel.add(new JButton("1"));
panel.add(new JButton("2"));//添加的button怎么不显示?
}
}
package myframe;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class TestButton { public static void main(String[] args) { ButtonFrame frame = new ButtonFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(150, 100);
frame.setResizable(false);
frame.setVisible(true);
}}class ButtonFrame extends JFrame { public ButtonFrame() { setTitle("test button");
ButtonPanel panel = new ButtonPanel();
add(panel); }}class ButtonPanel extends JPanel { public ButtonPanel() { setLayout(new GridLayout(2, 1)); add(new JButton("1"));
add(new JButton("2"));//添加的button怎么不显示?[/color] }}
或者;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class TestButton { public static void main(String[] args) { ButtonFrame frame = new ButtonFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(150, 100);
frame.setResizable(false);
frame.setVisible(true);
}}class ButtonFrame extends JFrame { public ButtonFrame() { setTitle("test button");
ButtonPanel panel = new ButtonPanel();
add(panel); }}class ButtonPanel extends JPanel { public ButtonPanel() { JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 1)); panel.add(new JButton("1"));
panel.add(new JButton("2"));//添加的button怎么不显示?[/color] add(panel);
}}
import java.awt.event.*;
import javax.swing.*;
public class TestButton { public static void main(String[] args) { ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(150,100);
frame.setResizable(false);
// frame.pack();
frame.setVisible(true);
}}class ButtonFrame extends JFrame{ public ButtonFrame(){ setTitle("test button");
ButtonPanel panel = new ButtonPanel(); add(panel);
//pack();
}}class ButtonPanel extends JPanel{ public ButtonPanel(){// JPanel panel = new JPanel();//这里建立panel始终没有加到ButtonPanel里面
setLayout(new GridLayout(2,1)); add(new JButton("1"));
add(new JButton("2"));//添加的button怎么不显示?[/color]
}
}