import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class addClassTest
{
public static void main(String [] args)
{
addClassFrame frame=new addClassFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}class addClassFrame extends JFrame
{
public addClassFrame() {
setTitle("addClass");
//setSize(300,600);
JFrame.setDefaultLookAndFeelDecorated(true);
Container contentPane=getContentPane();
addClassPanel pa=new addClassPanel();
contentPane.add(pa);
pack();
} }class addClassPanel extends JPanel
{
public addClassPanel()
{
JPanel panel;
JButton button1=new JButton("first button");
JButton button2=new JButton("second button");
JButton button3=new JButton("third button");
JButton button4=new JButton("fourth button");
JButton button5=new JButton("fifth button");
panel = new JPanel();
panel.setLayout(new GridLayout(1,2));
panel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(button5);
}
}
import java.awt.event.*;
import javax.swing.*;public class addClassTest
{
public static void main(String [] args)
{
addClassFrame frame=new addClassFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}class addClassFrame extends JFrame
{
public addClassFrame() {
setTitle("addClass");
//setSize(300,600);
JFrame.setDefaultLookAndFeelDecorated(true);
Container contentPane=getContentPane();
addClassPanel pa=new addClassPanel();
contentPane.add(pa);
pack();
} }class addClassPanel extends JPanel
{
public addClassPanel()
{
JPanel panel;
JButton button1=new JButton("first button");
JButton button2=new JButton("second button");
JButton button3=new JButton("third button");
JButton button4=new JButton("fourth button");
JButton button5=new JButton("fifth button");
panel = new JPanel();
panel.setLayout(new GridLayout(1,2));
panel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(button5);
}
}
//你这程序没调过,初始状态根本显示不出东西来,我改了改
//原来程序思路比较乱,尤其是那个panel看得一头雾水。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class addClassTest
{
public static void main(String [] args)
{
addClassFrame frame=new addClassFrame();
//setVisible 放到构造里,main里不要放细节
}
}class addClassFrame extends JFrame
{
public addClassFrame()
{
super("xxx");//你 super了没有?
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("addClass");
setSize(300,600);
JFrame.setDefaultLookAndFeelDecorated(true);
Container contentPane=getContentPane();
addClassPanel pa=new addClassPanel();
contentPane.add(pa);
pack();
setVisible(true);
} }class addClassPanel extends JPanel
{
public addClassPanel()
{
//JPanel panel;临时变量?昏啊,构造结束就没得了?你这样怎么可能在屏幕上有东西显示?
JButton button1=new JButton("first button");
JButton button2=new JButton("second button");
JButton button3=new JButton("third button");
JButton button4=new JButton("fourth button");
JButton button5=new JButton("fifth button");
// panel = new JPanel();//越发不明白,不给自己设定layout?又建立一个临时的?昏特
// panel.
setLayout(new GridLayout(3,2));//
//你原来只设定了(1,2)你强制规定一行,一行放两个,
//你加第三个的时候,系统看见你规定一行,就在一行里放下去了,不换行。
setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
add(button1);
add(button2);
add(button3);
add(button4);
add(button5);
} }
panel.add(button4);
panel.add(button5);
//添加
add(panel);
另外super("xxx");//你 super了没有?
他用的是一个无参的构造函数 可以不用super