/*

* 网络布局

* */

package com.swing;

import java.awt.GridLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

class gridlayout extends JFrame{

int size=6;

private JButton jbtn[]=new JButton[size];

public static void main(String[] args){

gridlayout glout=new gridlayout();

}

public gridlayout(){

this.setTitle("网格布局");

//设置大小

this.setSize(400,200);

//设置位置

this.setLayout(new GridLayout(3,3));

for(int i=0;i

jbtn[i]=new JButton(String.valueOf(i));

this.add(jbtn[i]);

}

this.setLocation(100,100);

//设置关闭时关掉进程

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

}

classEditextendsJFrameimplementsActionListener{privatestaticfinallongserialVersionUID=1L;JButtonadd=newJButton("添加");publicJComboBoxbox=newJComboBox();inti=2;Item[]item...

class Edit extends JFrame implements ActionListener {

private static final long serialVersionUID = 1L;

JButton add = new JButton("添加");

public JComboBox box = new JComboBox();

int i = 2;

Item[] item = new Item[10];

Item a = new Item();

public Edit() {

for (int j = 0; j < item.length; j++) {

item[j] = new Item();

}

this.setSize(100, 330);

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

Dimension frameSize = this.getPreferredSize();

this.setLocation(screenSize.width / 2 - frameSize.width,

screenSize.height / 2 - frameSize.height);

Container container = getContentPane();

container.setLayout(new GridLayout(11, 1));

for (int j = 0; j < 10; j++)

container.add(item[j]);

container.add(add);

add.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

Container container = getContentPane();

if (i + 1 < 11) {

for (int j = 0; j < i-1; j++)

container.add(item[j]);

container.add(add);

setSize(100,50*i);

}

}

class Item extends JPanel implements ActionListener {

JComboBox box2 = new JComboBox();

public Item() {

box2 = box;

Container container = getContentPane();

container.add(box2);

}

}

}

}

以上是我代码中的一段，我在网格布局中添加一个Item和一个按钮。我希望Edit中可以点击一次鼠标就添加一个Item，但是我点击一次按钮网格布局竟然变成了两列，这是为什么？

展开

我有以下程序，我遇到了一件事情的麻烦。我已经创建了一个网格布局，并且我使用JPanel在网格中输入按钮和文本，但是如果我的文本很长，一切似乎都会改变大小。有人可以帮助我如何防止这种情况发生？

这是我的代码：

package JFrameTester;

import java.awt.*;

import javax.swing.*;

public class JFrameTester {

public JPanel createContentPane(){

JPanel panel = new JPanel();

JButton button1,button2,button3,button4;

JPanel mainPanel = new JPanel(new GridLayout(2, 0, 40, 10));

//JPanel red = createSquareJPanel(Color.red, 50);

button1 = new JButton ("button1");

button2 = new JButton ("button2");

button3 = new JButton ("button3");

button4 = new JButton ("button4");

Label one = new Label("Rohihtjthjhtjghjghmgfjgjghjghj");

//add(button1);

mainPanel.add(button1);

mainPanel.add(one);

mainPanel.add(button2);

mainPanel.add(button3);

mainPanel.add(button4);

panel.add(mainPanel);

panel.setOpaque(true);

return panel;

}

public static void main(String[] args) {

JFrame frame = new JFrame("GridLayout");

JFrameTester Display = new JFrameTester();

frame.setContentPane(Display.createContentPane());

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.pack();

frame.setVisible(true);

}

}

2011-11-30

Led