关于窗体布局

Question

那位高手帮忙看一下，如何让组件居中显示
下面代码可以直接运行
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;class exper_4_1
{
JFrame frame=new JFrame("frame");
JPanel p1,p2,p3,p4,p5;
JLabel lab1,lab2;
JTextField t1,t2;
JButton b1,b2,b3;
public static void main(String[] args) 
{
exper_4_1 exp=new exper_4_1();
exp.go();
}
public void go()
{

p1=new JPanel();
p2=new JPanel();
p3=new JPanel();
p4=new JPanel();
p5=new JPanel(); lab1=new JLabel("Source");
lab2=new JLabel("Target");

t1=new JTextField(15);
t2=new JTextField(15);

p1.add(lab1);
p1.add(t1);
        p2.add(lab2);
p2.add(t2);
p3.setLayout(new GridLayout(2,1));
p3.add(p1);
p3.add(p2); b1=new JButton("Clear");
b2=new JButton("Copy");
b3=new JButton("Close");

p4.add(b1);
p4.add(b2);
p4.add(b3); p5.setLayout(new GridLayout(2,1));
p5.add(p3);
p5.add(p4); ActionListener b=new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
JButton b=(JButton)e.getSource();
if(b==b1)
{
t1.setText("");
t2.setText("");
}
else if(b==b2)
{
t2.setText(t1.getText());
}
else
{
  System.exit(0);  
}
}
};
b1.addActionListener(b);
b2.addActionListener(b);
b3.addActionListener(b);
Container cp=frame.getContentPane();
cp.setLayout(new BorderLayout());
cp.add(p5,"Center"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}代码直接可以运行，但我想让所有组件都距窗体边界有一段距离，类似于“回”结构，那位高手帮忙指点一下，拜托拜托~~

Answer 1

那就中间用flowlayout，居中，然后把你的组件放进这个flowlayout

Answer 2

你是说窗体弹出位置是屏幕的中央吗？
frame.setLocationRelativeTo(null);
或者Toolkit tkt= Toolkit.getDefaultToolkit();   
        Dimension screenSize = tkt.getScreenSize();   
        int screenHeight = screenSize.height;   
        int screenWidth = screenSize.width;    
        frame.setLocation(screenWidth/2, screenHeight/2);    

Answer 3

 窗体居中：方法一：
frame.setLocationRelativeTo(null);方法二：
Dimension winSize = Toolkit.getDefaultToolkit().getScreenSize(); //屏幕分辨率
frame.setLocation((winSize.width - frame.getWidth()) / 2, (winSize.height - frame.getHeight()) / 2); //窗口定位方法三：Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
setBounds(
screenSize.width/4,
screenSize.height/4,
screenSize.width/2,
screenSize.height/2 

Answer 4

说了用flowlayout嘛,公司电脑没有java环境，不好帮你测试，回家帮你看看

Answer 5

我建议你用netbeans呀，那样里面的布局GroupLayout不用自己写，托拉组件自动就有代码了。。
下面是个例子。。
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;/**
 *
 * @author Hongyang Sun
 */
public class SubFrame extends javax.swing.JFrame {
    static boolean loadMotifFile = false;
    static boolean loadRegulatorFile = false;
    static boolean loadGoFile = false;
    boolean loadCondAnnotationCategoryFile = false;
    boolean showFinishPop = false;
    
    /** Creates new form NewFrame */
    public SubFrame() {
        initComponents();
    }    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {        jLabel3 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Example");        jLabel3.setText("Output Data:");        jTextField1.setText("Necessary");
        jTextField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField1ActionPerformed(evt);
            }
        });        jButton1.setText("Browse");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(74, 74, 74)
                .addComponent(jLabel3)
                .addGap(74, 74, 74)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 257, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(110, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(261, Short.MAX_VALUE)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(231, 231, 231))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(52, 52, 52)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3))
                .addGap(39, 39, 39)
                .addComponent(jButton1)
                .addGap(25, 25, 25))
        );        pack();
    }// </editor-fold>    private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
}                                               //For parsing DISTILLER output
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        File f = null;
        String fileName = "";
        try {
            f = new File(fileName);
        } catch (Exception ex) {
            f = null;
        }        JFileChooser fileChooser = new JFileChooser();        fileChooser.setDialogTitle("Select a file to open...");
        fileChooser.setFileHidingEnabled(false);
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        fileChooser.setSelectedFile(f);
        //fileChooser.addChoosableFileFilter(new ImageFileFilter(".m"));        int choice = fileChooser.showOpenDialog(this);
        if (choice == JFileChooser.APPROVE_OPTION) {
            fileName = fileChooser.getSelectedFile().getAbsolutePath();
            System.out.println("Starting with file: " + fileName);            jTextField1.setText(fileName);
        }
}                                            //Save the XML file to a directory    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {            public void run() {
                new SubFrame().setVisible(true);
            }
        });
    }    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration
}

Answer 6

package com.xg.hsg;import java.awt.*;import javax.swing.*;
import java.awt.event.*;class exper_4_1 {
JFrame frame = new JFrame("frame");
JPanel p1, p2, p3, p4, p5;
JLabel lab1, lab2;
JTextField t1, t2;
JButton b1, b2, b3; public static void main(String[] args) {
exper_4_1 exp = new exper_4_1();
exp.go();
} public void go() { p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel(); lab1 = new JLabel("Source");
lab2 = new JLabel("Target"); t1 = new JTextField(15);
t2 = new JTextField(15); p1.add(lab1);
p1.add(t1);
p2.add(lab2);
p2.add(t2); p3.setLayout(new GridLayout(2, 1));
p3.add(p1);
p3.add(p2); b1 = new JButton("Clear");
b2 = new JButton("Copy");
b3 = new JButton("Close"); p4.add(b1);
p4.add(b2);
p4.add(b3); p5.setLayout(new GridLayout(2, 1));
p5.add(p3);
p5.add(p4); ActionListener b = new ActionListener() {
public void actionPerformed(ActionEvent e) {
JButton b = (JButton) e.getSource();
if (b == b1) {
t1.setText("");
t2.setText("");
} else if (b == b2) {
t2.setText(t1.getText());
} else {
System.exit(0);
}
}
};
b1.addActionListener(b);
b2.addActionListener(b);
b3.addActionListener(b);

frame.add(new BorderLayout().CENTER, p5);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 150); frame.setVisible(true);
}
}小弟也刚学java 错了别见怪！