GirdBagLayout布局中如何设置label范围

Question

GirdBagLayout布局中如何设置label范围
也就是让label宽度一定，
无论label中字符串多长，label都一样宽。
不会影响到画面的布局。

Answer 1

label.setPreferredSize(new Dimension(width, height));

Answer 2

好像好使
package test;import java.applet.Applet;
import java.awt.*;import javax.swing.JFrame;
import javax.swing.JLabel;public class GridBagExCopy extends Applet {    private static final long serialVersionUID = 1L;    protected void makebutton(String name, GridBagLayout gridbag,
            GridBagConstraints c) {
        Button button = new Button(name);
        gridbag.setConstraints(button, c);
        this.add(button);
    }    public void init() {
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints constraints = new GridBagConstraints();        setFont(new Font("SansSerif", Font.PLAIN, 14));
        this.setLayout(gridbag);        constraints.fill = GridBagConstraints.BOTH;
        constraints.weightx = 1.0;
        makebutton("Button2", gridbag, constraints);
        makebutton("Button3", gridbag, constraints);
        JLabel button = new JLabel("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
        button.setPreferredSize(new Dimension(10, -1));
        button.setMinimumSize(new Dimension(0, -1));
        gridbag.setConstraints(button, constraints);
        this.add(button);        constraints.gridwidth = GridBagConstraints.REMAINDER; // end row
        makebutton("Button4", gridbag, constraints);        setSize(300, 200);
    }    public static void main(String args[]) {
        JFrame f = new JFrame("GridBag Layout Example");
        GridBagExCopy ex1 = new GridBagExCopy();        ex1.init();        f.add("Center", ex1);
        f.pack();
        f.setSize(f.getPreferredSize());
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}