我想在
Java GUI中显示树,但我不知道如何.树代表连接节点的图形,如下所示：
我应该说我有自己的树类：
public class BinaryTree
{
private BinaryNode root;
public BinaryTree( )
{
root = null;
}
public BinaryTree( Object rootItem )
{
root = new BinaryNode( rootItem,null,null );
}
public BinaryTree( Object rootItem,BinaryNode a,BinaryNode b )
{
root = new BinaryNode( rootItem,a,b );
}
public int leavesCount(){
return BinaryNode.leavesCount(root);
}
public boolean equal(BinaryTree a,BinaryTree b){
return BinaryNode.equal(a.root,b.root);
}
public void printPreOrder( )
{
if( root != null )
root.printPreOrder( );
}
public void printInOrder( )
{
if( root != null )
root.printInOrder( );
}
public void printPostOrder( )
{
if( root != null )
root.printPostOrder( );
}
public void makeEmpty( )
{
root = null;
}
public boolean isEmpty( )
{
return root == null;
}
public void merge( Object rootItem,BinaryTree t1,BinaryTree t2 ) throws MergeAbrot
{
if( t1.root == t2.root && t1.root != null )
{
throw new MergeAbrot("MergeAbrot");
}
root=new BinaryNode( rootItem,t1.root,t2.root );
if( this != t1 )
t1.root = null;
if( this != t2 )
t2.root = null;
}
public int size( )
{
return BinaryNode.size( root );
}
public int height( )
{
return BinaryNode.height( root );
}
}
我只想画树.我应该怎么做？
解决方法
我可以想到的最简单的方法是编写一个扩展JPanel并覆盖其paintComponent()方法的类.在paint方法中,您可以遍历树并绘制每个节点.这里有一个简单的例子：
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JPanelTest extends JPanel {
@Override
public void paintComponent(Graphics g) {
// Draw Tree Here
g.drawOval(5,5,25,25);
}
public static void main(String[] args) {
JFrame jFrame = new JFrame();
jFrame.add(new JPanelTest());
jFrame.setSize(500,500);
jFrame.setVisible(true);
}
}
在树上画一个刺,如果你不能弄清楚你在你的问题上尝试了什么.
