Java GroupLayout Exception

Question

public class Grouplayout implements Runnable {
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Grouplayout());
}
@Override
public void run() {
    JFrame jFrame = new JFrame();
    GroupLayout layout = new GroupLayout(jFrame.getContentPane());
    jFrame.getContentPane().setLayout(layout);
    layout.setAutoCreateGaps(true);
    layout.setAutoCreateContainerGaps(true);
    JLabel jLabel1 = new JLabel("a");
    JLabel jLabel2 = new JLabel("b");
    JLabel jLabel3 = new JLabel("c");
    JLabel jLabel4 = new JLabel("d");
    layout.setVerticalGroup(
        layout.createSequentialGroup()
            .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1)
                .addComponent(jLabel2))
            .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel3)
                .addComponent(jLabel4)));
    jFrame.pack();
    jFrame.setVisible(true);
}
}

我正在尝试运行它，但我有以下异常:

线程"AWT-EventQueue-0"中的异常java.lang.IllegalStateException: javax.swing.JLabel[，0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=，flags=8388608,maximumSize=，minimumSize=，preferredSize=，defaultIcon=，disabledIcon=，horizontalAlignment=LEADING,horizontalTextPosition=TRAILING,iconTextGap=4,labelFor=，text=a,verticalAlignment=CENTER,verticalTextPosition=CENTER]未附加到水平组

有什么问题吗?我该怎么修理它?

Answer 1

你必须指定水平和垂直布局，也看到GroupLayout给出错误与java swing

我建议您使用一个工具来帮助您构建GUI。