JLabel 问题

Question

请问,我要让三个JLabel水平放在一个JPanel里,
并且按照JPanel总长度的 40%,50%,10% 分布,要不留空隙.
请教各位大侠了!

Answer 1

用GridBagLayout做吧，JPanel.setLayout(new GridBagLayout());
GridBagConstraints g = new GridBagConstraints();
g.gridx = 0;
g.gridy = 0;
g.gridwidth = 1;
g.gridheight = 1;
g.weightx = 0.4;//40%
g.weighty = 1.0;
JPanel.add(JLabel1,g);
g.gridy = 1;
g.weightx = 0.5;//50%
JPanel.add(JLabel2,g);
g.gridy = 2;
g.weightx = 0.1;//10%
JPanel.add(JLabel3,g);

Answer 2

感谢Kacisusu!我修改了下代码,如果要obj4重叠在 obj1,obj2,obj3上面,并且能透明背景色,能自动缩放,如何做到?
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;public class test extends JFrame {
private JFrame frame = null;
private JPanel pane = null;
private int gridx, gridy, gridwidth, gridheight, anchor, fill, ipadx,
ipady;
private double weightx, weighty;
private Insets insert; public test() {
frame = new JFrame("Test");
pane = new JPanel();
GridBagLayout gbl = new GridBagLayout();
GridBagConstraints gbc = null;
pane.setLayout(gbl);
//
JLabel obj1 = new JLabel("1");
obj1.setBorder(BorderFactory.createLineBorder(Color.black));
JLabel obj2 = new JLabel("2");
obj2.setBorder(BorderFactory.createMatteBorder(
                1, 5, 1, 1, Color.red));
JLabel obj3 = new JLabel("3");
obj3.setBorder(BorderFactory.createLineBorder(Color.black));
JLabel obj4 = new JLabel("down"); gridx = 0;
gridy = 0;
gridwidth = 1;
gridheight = 1;
insert = new Insets(0, 0, 0, 0); //the gap between components
//


//
weightx = 0.5;
weighty = 0.0;
anchor = gbc.NORTH;
fill = gbc.HORIZONTAL;

gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
weightx, weighty, anchor, fill, insert, ipadx, ipady);
gbl.setConstraints(obj1, gbc);
pane.add(obj1); gridx = 1;
weightx = 0.3;
anchor = gbc.CENTER;
fill = gbc.BOTH;
gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
weightx, weighty, anchor, fill, insert, ipadx, ipady);
gbl.setConstraints(obj2, gbc);
pane.add(obj2); gridx = 2;
weightx = 0.2;
anchor = gbc.CENTER;
fill = gbc.BOTH;
gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
weightx, weighty, anchor, fill, insert, ipadx, ipady);
gbl.setConstraints(obj3, gbc);
pane.add(obj3);

frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.getContentPane().add(pane);
frame.setSize(300, 200);
frame.setVisible(true);
} public static void main(String args[]) {
test t = new test();
}}