java按钮控件边框留白.doc

实现按钮控件边框留白
关键技术：
简单的EmptyBorder边框
EmptyBorder边框的最简单的应用，就是通过4个整型参数指定新建边框的四边留白
public EmptyBorder(int top,int left,int botton,int right)
top:顶部留白
left左边留白
botton底部留白
right右边留白
package llt.swing08;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.UIManager;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
public class ShowEmptyBorder extends JFrame {

private JPanel contentPane;

/**
* Launch the application.
*/
public static void main(String[] args) {
try {
UIManager
.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (Throwable e) {
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ShowEmptyBorder frame = new ShowEmptyBorder();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the frame.
*/
public ShowEmptyBorder() {
setTitle("力天教育——实现按钮控件的留白");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 328, 336);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JButton button = new JButton("演示按钮");
button.setBorder(new EmptyBorder(40, 0, 0, 0));// 顶部留白：40pix
button.setBounds(19, 106, 109, 64);
contentPane.add(button);

JButton button_1 = new JButton("演示按钮");
button_1.setBorder(new EmptyBorder(0, 40, 0, 0));// 左侧留白：40pix
button_1.setBounds(177, 14, 109, 64);
contentPane.add(button_1);

JButton button_2 = new JButton("演示按钮");
button_2.setBorder(new EmptyBorder(0, 0, 0, 40));// 右侧留白：40pix
button_2.setBounds(19, 14, 109, 64);
contentPane.add(button_2);

JButton button_3 = new JButton("演示按钮");
button_3.setBorder(new EmptyBorder(0, 0, 40, 0));// 底部留白：40pix
button_3.setBounds(177, 106, 109, 64);
contentPane.add(button_3);

JButton button_4 = new JButton("演示按钮");
button_4.setBorder(new EmptyBorder(0, 0, 40, 40));// 右侧和底部留白：40pix
button_4.setBounds(19, 201, 109, 64);
contentPane.add(button_4);

JButton button_5 = new JButton("演示按钮");
button_5.setBorder(new EmptyBorder(40, 40, 0, 0));// 左侧和顶部留白：40pix
button_5.setBounds(177, 198, 109, 64);
contentPane.add(button_5);

JLabel lblpix = new JLabel("右则留白40pix");
lblpix.setHorizontalAlignment(SwingConstants.CENTER);
lblpix.setBounds(19, 76, 109, 18);
contentPane.add(lblpix);

JLabel lblpix_4 = new JLabel(
"右则和底部留白40pix");
lblpix_4.setHorizontalAlignment(SwingConstants.CENTER);
lblpix_4.setBounds(6, 263, 134, 18);
contentPane.add(lblpix_4);

JLabel lblpix_5 = new JLabel(
"左则和底部留白40pix");
lblpix_5.setHorizontalAlignment(SwingConstants.CENTER);
lblpix_5.setBounds(161, 263, 145, 18);
contentPane.add(lblpix_5);

JLabel lblpix_1 = new JLabel("左则留白40pix");
lblpix_1.setHorizontalAlignment(SwingConstants.CENTER);
lblpix_1.setBounds(177, 76, 109, 18);
contentPane.add(lblpix_1);

JLabel lblpix_2 = new JLabel("顶部留白40pix");
lblpix_2.setHorizontalAlignment(SwingConstants.CENTER);
lblpix_2.setBounds(19, 171, 109, 18);
contentPane.add(lblpix_2);

JLabel lblpix_3 = new JLabel("底部留白40pix");
lblpix_3.setHorizontalAlignment(SwingConstants.CENTER);
lblpix_3.setBounds(177, 171, 109, 18);
contentPane.add(lblpix_3);

}
}
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