Java 未显示JSplitPane setOneTouchExpandable（true）

我正在使用嵌套的JSplitPane

我想使用OneTouchExpandable，但是没有显示运行代码。。。 但在预览模式下，我可以看到它

此处完成代码：

import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JSplitPane;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import java.awt.Dimension;
import java.util.logging.Level;
import java.util.logging.Logger;

package splitpane;

public class JFr_SplitPane extends JFrame {

  private JButton jbLeftRight;
  private JButton jbRightLeft;
  private JButton jbRightRight;
  private JLabel jlLeftLeft;
  private JPanel jpLeftLeft;
  private JPanel jpLeftRight;
  private JPanel jpMain;
  private JPanel jpRightLeft;
  private JPanel jpRightRight;
  private JSplitPane jspLeft;
  private JSplitPane jspMain;
  private JSplitPane jspRight;
  private JTextField jtfLeftLeft;
  private JTextField jtfLeftRight;
  private JTextField jtfRightLeft;
  private JTextField jtfRightRight;  

  public JFr_SplitPane() {
    initComponents();
  }
  private void initComponents() {

    jpMain = new JPanel();
    jspMain = new JSplitPane();
    jspLeft = new JSplitPane();
    jpLeftLeft = new JPanel();
    jlLeftLeft = new JLabel();
    jtfLeftLeft = new JTextField();
    jpLeftRight = new JPanel();
    jbLeftRight = new JButton();
    jtfLeftRight = new JTextField();
    jspRight = new JSplitPane();
    jpRightLeft = new JPanel();
    jbRightLeft = new JButton();
    jtfRightLeft = new JTextField();
    jpRightRight = new JPanel();
    jbRightRight = new JButton();
    jtfRightRight = new JTextField();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jpMain.setBorder(javax.swing.BorderFactory.createEtchedBorder());
    jpMain.setPreferredSize(new Dimension(692, 36));

    jspMain.setDividerLocation(344);
    jspMain.setMinimumSize(new Dimension(276, 28));
    jspMain.setOneTouchExpandable(true);
    jspMain.setPreferredSize(new Dimension(688, 34));

    jspLeft.setDividerLocation(169);
    jspLeft.setMinimumSize(new Dimension(132, 25));
    jspLeft.setOneTouchExpandable(true);
    jspLeft.setPreferredSize(new Dimension(338, 30));

    jpLeftLeft.setMinimumSize(new Dimension(60, 25));
    jpLeftLeft.setPreferredSize(new Dimension(320, 25));

    jlLeftLeft.setBorder(javax.swing.BorderFactory.createEtchedBorder());
    jlLeftLeft.setPreferredSize(new Dimension(24, 18));

    jtfLeftLeft.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpLeftLeftLayout = new GroupLayout(jpLeftLeft);
    jpLeftLeft.setLayout(jpLeftLeftLayout);
    jpLeftLeftLayout.setHorizontalGroup(
      jpLeftLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftLeftLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jlLeftLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfLeftLeft, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpLeftLeftLayout.setVerticalGroup(
      jpLeftLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftLeftLayout.createSequentialGroup()
        .addGap(3, 3, 3)
        .addComponent(jlLeftLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      .addComponent(jtfLeftLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
    );

    jspLeft.setLeftComponent(jpLeftLeft);

    jpLeftRight.setMinimumSize(new Dimension(60, 25));
    jpLeftRight.setPreferredSize(new Dimension(320, 25));

    jbLeftRight.setPreferredSize(new Dimension(30, 21));

    jtfLeftRight.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpLeftRightLayout = new GroupLayout(jpLeftRight);
    jpLeftRight.setLayout(jpLeftRightLayout);
    jpLeftRightLayout.setHorizontalGroup(
      jpLeftRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftRightLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jbLeftRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfLeftRight, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpLeftRightLayout.setVerticalGroup(
      jpLeftRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftRightLayout.createParallelGroup(Alignment.CENTER)
        .addComponent(jbLeftRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addComponent(jtfLeftRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
    );

    jspLeft.setRightComponent(jpLeftRight);

    jspMain.setLeftComponent(jspLeft);

    jspRight.setDividerLocation(169);
    jspRight.setMinimumSize(new Dimension(132, 25));
    jspRight.setOneTouchExpandable(true);
    jspRight.setPreferredSize(new Dimension(338, 30));

    jpRightLeft.setMinimumSize(new Dimension(60, 25));
    jpRightLeft.setPreferredSize(new Dimension(320, 25));

    jbRightLeft.setPreferredSize(new Dimension(30, 21));

    jtfRightLeft.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpRightLeftLayout = new GroupLayout(jpRightLeft);
    jpRightLeft.setLayout(jpRightLeftLayout);
    jpRightLeftLayout.setHorizontalGroup(
      jpRightLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightLeftLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jbRightLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfRightLeft, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpRightLeftLayout.setVerticalGroup(
      jpRightLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightLeftLayout.createSequentialGroup()
        .addGap(2, 2, 2)
        .addComponent(jbRightLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      .addComponent(jtfRightLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
    );

    jspRight.setLeftComponent(jpRightLeft);

    jpRightRight.setMinimumSize(new Dimension(60, 25));
    jpRightRight.setPreferredSize(new Dimension(320, 25));

    jbRightRight.setPreferredSize(new Dimension(30, 21));

    jtfRightRight.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpRightRightLayout = new GroupLayout(jpRightRight);
    jpRightRight.setLayout(jpRightRightLayout);
    jpRightRightLayout.setHorizontalGroup(
      jpRightRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightRightLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jbRightRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfRightRight, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpRightRightLayout.setVerticalGroup(
      jpRightRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightRightLayout.createSequentialGroup()
        .addGap(2, 2, 2)
        .addComponent(jbRightRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      .addGroup(jpRightRightLayout.createSequentialGroup()
        .addComponent(jtfRightRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(0, 0, Short.MAX_VALUE))
    );

    jspRight.setRightComponent(jpRightRight);

    jspMain.setRightComponent(jspRight);

    GroupLayout jpMainLayout = new GroupLayout(jpMain);
    jpMain.setLayout(jpMainLayout);
    jpMainLayout.setHorizontalGroup(
      jpMainLayout.createParallelGroup(Alignment.LEADING)
      .addComponent(jspMain, Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    jpMainLayout.setVerticalGroup(
      jpMainLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(Alignment.TRAILING, jpMainLayout.createSequentialGroup()
        .addGap(0, 0, 0)
        .addComponent(jspMain, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
    );

    GroupLayout layout = new GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
      layout.createParallelGroup(Alignment.LEADING)
      .addGap(0, 702, Short.MAX_VALUE)
      .addGroup(layout.createParallelGroup(Alignment.LEADING)
        .addGroup(Alignment.TRAILING, layout.createSequentialGroup()
          .addGap(0, 0, 0)
          .addComponent(jpMain, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
          .addContainerGap()))
    );
    layout.setVerticalGroup(
      layout.createParallelGroup(Alignment.LEADING)
      .addGap(0, 54, Short.MAX_VALUE)
      .addGroup(layout.createParallelGroup(Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
          .addGap(0, 0, 0)
          .addComponent(jpMain, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
          .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
    );

    pack();
  }

  public static void main(String args[]) {
    try {
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
        if ("Nimbus".equals(info.getName())) {
          javax.swing.UIManager.setLookAndFeel(info.getClassName());
          break;
        }
      }
    } catch (ClassNotFoundException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    }

    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        new JFr_SplitPane().setVisible(true);
      }
    });
  }
}

在预览模式下：

import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JSplitPane;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import java.awt.Dimension;
import java.util.logging.Level;
import java.util.logging.Logger;

package splitpane;

public class JFr_SplitPane extends JFrame {

  private JButton jbLeftRight;
  private JButton jbRightLeft;
  private JButton jbRightRight;
  private JLabel jlLeftLeft;
  private JPanel jpLeftLeft;
  private JPanel jpLeftRight;
  private JPanel jpMain;
  private JPanel jpRightLeft;
  private JPanel jpRightRight;
  private JSplitPane jspLeft;
  private JSplitPane jspMain;
  private JSplitPane jspRight;
  private JTextField jtfLeftLeft;
  private JTextField jtfLeftRight;
  private JTextField jtfRightLeft;
  private JTextField jtfRightRight;  

  public JFr_SplitPane() {
    initComponents();
  }
  private void initComponents() {

    jpMain = new JPanel();
    jspMain = new JSplitPane();
    jspLeft = new JSplitPane();
    jpLeftLeft = new JPanel();
    jlLeftLeft = new JLabel();
    jtfLeftLeft = new JTextField();
    jpLeftRight = new JPanel();
    jbLeftRight = new JButton();
    jtfLeftRight = new JTextField();
    jspRight = new JSplitPane();
    jpRightLeft = new JPanel();
    jbRightLeft = new JButton();
    jtfRightLeft = new JTextField();
    jpRightRight = new JPanel();
    jbRightRight = new JButton();
    jtfRightRight = new JTextField();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jpMain.setBorder(javax.swing.BorderFactory.createEtchedBorder());
    jpMain.setPreferredSize(new Dimension(692, 36));

    jspMain.setDividerLocation(344);
    jspMain.setMinimumSize(new Dimension(276, 28));
    jspMain.setOneTouchExpandable(true);
    jspMain.setPreferredSize(new Dimension(688, 34));

    jspLeft.setDividerLocation(169);
    jspLeft.setMinimumSize(new Dimension(132, 25));
    jspLeft.setOneTouchExpandable(true);
    jspLeft.setPreferredSize(new Dimension(338, 30));

    jpLeftLeft.setMinimumSize(new Dimension(60, 25));
    jpLeftLeft.setPreferredSize(new Dimension(320, 25));

    jlLeftLeft.setBorder(javax.swing.BorderFactory.createEtchedBorder());
    jlLeftLeft.setPreferredSize(new Dimension(24, 18));

    jtfLeftLeft.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpLeftLeftLayout = new GroupLayout(jpLeftLeft);
    jpLeftLeft.setLayout(jpLeftLeftLayout);
    jpLeftLeftLayout.setHorizontalGroup(
      jpLeftLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftLeftLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jlLeftLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfLeftLeft, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpLeftLeftLayout.setVerticalGroup(
      jpLeftLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftLeftLayout.createSequentialGroup()
        .addGap(3, 3, 3)
        .addComponent(jlLeftLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      .addComponent(jtfLeftLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
    );

    jspLeft.setLeftComponent(jpLeftLeft);

    jpLeftRight.setMinimumSize(new Dimension(60, 25));
    jpLeftRight.setPreferredSize(new Dimension(320, 25));

    jbLeftRight.setPreferredSize(new Dimension(30, 21));

    jtfLeftRight.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpLeftRightLayout = new GroupLayout(jpLeftRight);
    jpLeftRight.setLayout(jpLeftRightLayout);
    jpLeftRightLayout.setHorizontalGroup(
      jpLeftRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftRightLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jbLeftRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfLeftRight, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpLeftRightLayout.setVerticalGroup(
      jpLeftRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpLeftRightLayout.createParallelGroup(Alignment.CENTER)
        .addComponent(jbLeftRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addComponent(jtfLeftRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
    );

    jspLeft.setRightComponent(jpLeftRight);

    jspMain.setLeftComponent(jspLeft);

    jspRight.setDividerLocation(169);
    jspRight.setMinimumSize(new Dimension(132, 25));
    jspRight.setOneTouchExpandable(true);
    jspRight.setPreferredSize(new Dimension(338, 30));

    jpRightLeft.setMinimumSize(new Dimension(60, 25));
    jpRightLeft.setPreferredSize(new Dimension(320, 25));

    jbRightLeft.setPreferredSize(new Dimension(30, 21));

    jtfRightLeft.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpRightLeftLayout = new GroupLayout(jpRightLeft);
    jpRightLeft.setLayout(jpRightLeftLayout);
    jpRightLeftLayout.setHorizontalGroup(
      jpRightLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightLeftLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jbRightLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfRightLeft, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpRightLeftLayout.setVerticalGroup(
      jpRightLeftLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightLeftLayout.createSequentialGroup()
        .addGap(2, 2, 2)
        .addComponent(jbRightLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      .addComponent(jtfRightLeft, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
    );

    jspRight.setLeftComponent(jpRightLeft);

    jpRightRight.setMinimumSize(new Dimension(60, 25));
    jpRightRight.setPreferredSize(new Dimension(320, 25));

    jbRightRight.setPreferredSize(new Dimension(30, 21));

    jtfRightRight.setPreferredSize(new Dimension(6, 25));

    GroupLayout jpRightRightLayout = new GroupLayout(jpRightRight);
    jpRightRight.setLayout(jpRightRightLayout);
    jpRightRightLayout.setHorizontalGroup(
      jpRightRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightRightLayout.createSequentialGroup()
        .addGap(4, 4, 4)
        .addComponent(jbRightRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(2, 2, 2)
        .addComponent(jtfRightRight, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addContainerGap())
    );
    jpRightRightLayout.setVerticalGroup(
      jpRightRightLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(jpRightRightLayout.createSequentialGroup()
        .addGap(2, 2, 2)
        .addComponent(jbRightRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
      .addGroup(jpRightRightLayout.createSequentialGroup()
        .addComponent(jtfRightRight, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
        .addGap(0, 0, Short.MAX_VALUE))
    );

    jspRight.setRightComponent(jpRightRight);

    jspMain.setRightComponent(jspRight);

    GroupLayout jpMainLayout = new GroupLayout(jpMain);
    jpMain.setLayout(jpMainLayout);
    jpMainLayout.setHorizontalGroup(
      jpMainLayout.createParallelGroup(Alignment.LEADING)
      .addComponent(jspMain, Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    jpMainLayout.setVerticalGroup(
      jpMainLayout.createParallelGroup(Alignment.LEADING)
      .addGroup(Alignment.TRAILING, jpMainLayout.createSequentialGroup()
        .addGap(0, 0, 0)
        .addComponent(jspMain, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
    );

    GroupLayout layout = new GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
      layout.createParallelGroup(Alignment.LEADING)
      .addGap(0, 702, Short.MAX_VALUE)
      .addGroup(layout.createParallelGroup(Alignment.LEADING)
        .addGroup(Alignment.TRAILING, layout.createSequentialGroup()
          .addGap(0, 0, 0)
          .addComponent(jpMain, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
          .addContainerGap()))
    );
    layout.setVerticalGroup(
      layout.createParallelGroup(Alignment.LEADING)
      .addGap(0, 54, Short.MAX_VALUE)
      .addGroup(layout.createParallelGroup(Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
          .addGap(0, 0, 0)
          .addComponent(jpMain, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
          .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
    );

    pack();
  }

  public static void main(String args[]) {
    try {
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
        if ("Nimbus".equals(info.getName())) {
          javax.swing.UIManager.setLookAndFeel(info.getClassName());
          break;
        }
      }
    } catch (ClassNotFoundException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
      Logger.getLogger(JFr_SplitPane.class.getName()).log(Level.SEVERE, null, ex);
    }

    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        new JFr_SplitPane().setVisible(true);
      }
    });
  }
}

未显示运行状态

有什么问题吗？

我如何解决它？

测试外观和感觉

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Windows经典

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金属

---

您可能正在寻找：

import java.awt.*；
导入javax.swing.*；
公共类一触式按钮OffSetTest{
公共JComponent makeUI（）{
System.out.println（UIManager.getInt（“SplitPane.oneTouchButtonOffset”）；
UIManager.put（“拆分窗格.一键按钮偏移”，0）；
UIDefaults d=新的UIDefaults（）；
d、 放置（“SplitPane:SplitPaneVider[已启用+垂直].foregroundPainter”，
新画家（）{
@覆盖公共空白绘制（图形2D g、J组件c、int w、int h）{
/*空的*/
}
});
JSplitPane splitPane=新的JSplitPane（）；
splitPane.putClientProperty（“Nimbus.Overrides”，d）；
setLeftComponent（makePanel（））；
setRightComponent（makePanel（））；
splitPane.setOneTouchExpandable（true）；
JPanel p=newjpanel（newborderlayout（））；
p、 setBorder（BorderFactory.createEmptyByOrder（5,5,5,5））；
p、 添加（拆分窗格，BorderLayout.NORTH）；
返回p；
}
私有静态JComponent makePanel（）{
JPanel p=newjpanel（newborderlayout（））；
p、 添加（new JButton（），BorderLayout.WEST）；
p、 添加（新JTextField（“aaaaaa”）；
返回p；
}
公共静态void main（字符串…参数）{
EventQueue.invokeLater（（）->{
试一试{
对于（UIManager.LookAndFeelInfo-laf:UIManager.getInstalledLookAndFeels（））{
if（“Nimbus”.equals（laf.getName（）））{
UIManager.setLookAndFeel（laf.getClassName（））；
}
}
}捕获（例外情况除外）{
例如printStackTrace（）；
}
JFrame f=新的JFrame（）；
f、 setDefaultCloseOperation（WindowConstants.EXIT_ON_CLOSE）；
f、 getContentPane（）.add（新的OneTouchButtonOffsetTest（）.makeUI（））；
f、 设置大小（320240）；
f、 setLocationRelativeTo（空）；
f、 setVisible（真）；
});
}
}

根据@aterai：

下面是应用于项目中所有JSplitPane的代码

UIManager.put("SplitPane.oneTouchButtonOffset", 0);
UIDefaults uidef = new UIDefaults();
uidef.put("SplitPane:SplitPaneDivider[Enabled+Vertical].foregroundPainter", 
    (Painter<JComponent>) (Graphics2D g, JComponent c, int w, int h) -> { });

List<JSplitPane> listComp1 = getSpecTypeComponents(this, JSplitPane.class);
for (JSplitPane lc : listComp1) {
  lc.putClientProperty("Nimbus.Overrides", uidef);
}

UIManager.put（“SplitPane.oneTouchButtonOffset”，0）；
UIDefaults uidef=新的UIDefaults（）；
uidef.put（“拆分窗格：拆分窗格编辑器[已启用+垂直].foregroundPainter”，
（画师）（图形2d g，j组件c，int w，int h）->{}；
List listComp1=getSpecTypeComponents（这是JSplitPane.class）；
对于（JSplitPane lc:listComp1）{
lc.putClientProperty（“Nimbus.Overrides”，uidef）；
}

使用的方法代码

/**
  return a List with all component according to Type class submmit
*/
private <T> List<T> getSpecTypeComponents(Container cntr, 
    Class<? extends javax.swing.JComponent> JCompClass) {
  List<Component> lstComp = new ArrayList<>();
  fillSpecTypeComponents(cntr, JCompClass, lstComp);
  return (ArrayList<T>)(lstComp);  // I'm not sure is bad practice...
}

/**

*/
private void fillSpecTypeComponents(Container cntr, 
    Class<? extends javax.swing.JComponent> JCompClass, List<Component> lstComp) {
  for (Component compnnt : cntr.getComponents()) {
    if (compnnt.getClass() == JCompClass) {
      lstComp.add(compnnt);
    }
    if (Container.class.isAssignableFrom(compnnt.getClass())) {
      fillSpecTypeComponents((Container) compnnt, JCompClass, lstComp);
    }
  }
}

/**
根据类型类submmit返回包含所有组件的列表
*/
私有列表getSpecTypeComponents（容器cntr，
ClassIt不需要超过250 LOC来演示单个组件的问题！为了更快地获得更好的帮助，请发布一个或。顺便说一句-您确实注意到这两个组件使用的是不同的PLAF，对吗？可能是重复的。
JSplitPane
可能没有足够的高度来呈现控件，但我没有时间测试它我认为这是Nimbus外观的一个问题。使用默认值会显示箭头图像。甚至为此引发了一个错误。但不确定它是否得到了修复。