import javax.swing.*;
import java.awt.Dimension;
import java.awt.BorderLayout;

public class JSplitPaneTest4 extends JFrame{

  public static void main(String[] args){
    JSplitPaneTest4 frame = new JSplitPaneTest4();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("タイトル");
    frame.setVisible(true);
  }

  JSplitPaneTest4(){
    JSplitPane splitpane = new JSplitPane();

    JPanel leftPanel = new JPanel();
    JButton leftButton = new JButton("Left");
    leftPanel.add(leftButton);

    Dimension pre = leftPanel.getPreferredSize();
    Dimension max = leftPanel.getMaximumSize();
    Dimension mix = leftPanel.getMinimumSize();
    System.out.println("左側コンポーネント");
    System.out.println("推奨:(" + pre.width + "," + pre.height + ")");
    System.out.println("最大:(" + max.width + "," + max.height + ")");
    System.out.println("最小:(" + mix.width + "," + mix.height + ")");

    JPanel rightPanel = new JPanel();
    JButton rightButton = new JButton("Right");
    rightPanel.add(rightButton);

    pre = rightPanel.getPreferredSize();
    max = rightPanel.getMaximumSize();
    mix = rightPanel.getMinimumSize();
    System.out.println("右側コンポーネント");
    System.out.println("推奨:(" + pre.width + "," + pre.height + ")");
    System.out.println("最大:(" + max.width + "," + max.height + ")");
    System.out.println("最小:(" + mix.width + "," + mix.height + ")");

    splitpane.setLeftComponent(leftPanel);
    splitpane.setRightComponent(rightPanel);

    getContentPane().add(splitpane, BorderLayout.CENTER);
  }