Swing Java Tutorial

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  4. JTree lineStyle client property
The JTree.lineStyle property has the following valid settings:
None :not drawing lines to connect nodes
Angled :the default setting for Ocean, for drawing lines in the Tree.hash color to connect the nodes
Horizontal:for drawing horizontal lines between first-level nodes in the Tree.line color
The JTree.lineStyle client property is used only by the Metal look and feel.
This client property is specific to tree components, and it is not set for all trees.

import java.awt.BorderLayout;
import java.util.Vector;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.UIManager;
class TreeNodeVector extends Vector {
  String name;
  TreeNodeVector(String name) {
    this.name = name;
  }
  TreeNodeVector(String name, E elements[]) {
    this.name = name;
    for (int i = 0, n = elements.length; i < n; i++) {
      add(elements[i]);
    }
  }
  public String toString() {
    return "[" + name + "]";
  }
}
public class ChangingTreeLineStyle {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("JTreeSample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Vector v1 = new TreeNodeVector("Two", new String[] { "Mercury", "Venus",
        "Mars" });
    Vector v2 = new TreeNodeVector("Three");
    v2.add(System.getProperties());
    v2.add(v1);
    Object rootNodes[] = {v1, v2 };
    Vector rootVector = new TreeNodeVector("Root", rootNodes);
    JTree tree = new JTree(rootVector);
    tree.putClientProperty("JTree.lineStyle", "None");
    
    frame.add(new JScrollPane(tree), BorderLayout.CENTER);
    frame.setSize(300, 300);
    frame.setVisible(true);
    
  }
}