居中显示.txt

默认情况下窗口总是以（0

/*
 * CenterJFrame.java
 *
 * Created on 2007年5月17日, 下午7:34
 */

package OrderSystem;
import java.awt.*;
import javax.swing.JFrame;
/**
 *
 * @author  Owner
 */
public class CenterJFrame extends javax.swing.JFrame {
    
    /**
     * Creates new form CenterJFrame
     */
    public CenterJFrame() {
        initComponents();
        int x=Toolkit.getDefaultToolkit().getScreenSize().width;
        int y=Toolkit.getDefaultToolkit().getScreenSize().height;
        int a=this.getWidth();
        int b=this.getHeight();
        setBounds((x-a)/2,(y-b)/2,a,b);
        
    }
    
    /** 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.
     */
    // <editor-fold defaultstate="collapsed" desc=" 生成的代码 ">//GEN-BEGIN:initComponents
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new CenterJFrame().setVisible(true);
            }
        });
    }
    
    // 变量声明 - 不进行修改//GEN-BEGIN:variables
    // 变量声明结束//GEN-END:variables
    
}