这使用GridBagLayout进行所需的操作。您可能会使用组件的setMinimumSize和setPreferedSize。
import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import javax.swing.*;import javax.swing.tree.DefaultMutableTreeNode;public class Testframe extends Jframe { private static final long serialVersionUID = 1L; public Testframe() { super("Top frame"); setDefaultCloseOperation(EXIT_ON_CLOSE); JPanel panel = new JPanel(new GridBagLayout()); JTree env = getEnvironmentTree(); env.expandRow(0); GridBagConstraints c = new GridBagConstraints(); c.fill = GridBagConstraints.BOTH; c.weightx=.7; c.weighty=1; c.gridx=0; c.gridy=0; c.gridheight=1; c.gridwidth=7; panel.add(new JScrollPane(env),c); c.weightx=.3; c.gridx=7; c.gridy=0; c.gridheight=1; c.gridwidth=GridBagConstraints.REMAINDER; panel.add(new Jtextarea("Some contents"),c); add(panel); setSize(800, 600); setLocationRelativeTo(null); setVisible(true); } private JTree getEnvironmentTree() { DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root"); JTree tree = new JTree(root); DefaultMutableTreeNode one = new DefaultMutableTreeNode("One"); root.add(one); one.add(new DefaultMutableTreeNode("under one.1")); one.add(new DefaultMutableTreeNode("under one.2")); root.add(new DefaultMutableTreeNode("two")); root.add(new DefaultMutableTreeNode("three")); return tree; } public static void main(String[] args) { new Testframe(); }}
