Question

java中布局问题

我在JPanel中添加了4个button,使用BoxLayout布局管理器垂直排列，但是这4个按钮在垂直方向上紧紧地挨在一起，我想在每个按钮之间设置空隙，这应该怎么弄啊？

Answer 1

使用BOX类的createRigidArea方法
JButton button;
　　Container pane = getContentPane();
　　BoxLayout boxlayout = new BoxLayout(pane,BoxLayout.Y_AXIS);
　　pane.setLayout(boxlayout);
　　pane.add(Box.createRigidArea(new Dimension(100,10)));//设置上下左右的间距

Answer 2

public class NewJFrame1 extends javax.swing.JFrame {

/** Creates new form NewJFrame1 */
public NewJFrame1() {
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() {
java.awt.GridBagConstraints gridBagConstraints;

jScrollPane1 = new javax.swing.JScrollPane();
jTree1 = new javax.swing.JTree();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setName("Form"); // NOI18N
getContentPane().setLayout(new java.awt.GridBagLayout());

jScrollPane1.setName("jScrollPane1"); // NOI18N

jTree1.setName("jTree1"); // NOI18N
jScrollPane1.setViewportView(jTree1);

gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.weighty = 1.0;
getContentPane().add(jScrollPane1, gridBagConstraints);

jLabel1.setText(org.openide.util.NbBundle.getMessage(NewJFrame1.class, "NewJFrame1.jLabel1.text")); // NOI18N
jLabel1.setName("jLabel1"); // NOI18N
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
gridBagConstraints.ipady = 15;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
getContentPane().add(jLabel1, gridBagConstraints);

jLabel2.setText(org.openide.util.NbBundle.getMessage(NewJFrame1.class, "NewJFrame1.jLabel2.text")); // NOI18N
jLabel2.setName("jLabel2"); // NOI18N
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 2;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
gridBagConstraints.ipady = 15;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
getContentPane().add(jLabel2, gridBagConstraints);

pack();
}// </editor-fold>

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame1().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTree jTree1;
// End of variables declaration

}

Answer 3

你在后面加上它的宽度和高度呀，你去查查文档他的构造方法有这个的

Answer 4

改为手动布局吧