compile java online

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//Title of this code
//'main' method must be in a class 'Rextester'.
//Compiler version 1.7.0_51

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        TreeNode root=new TreeNode(10);
		TreeNode n2=new TreeNode(1);
		TreeNode n3=new TreeNode(7);
		TreeNode n4=new TreeNode(4);
		TreeNode n5=new TreeNode(9);
		TreeNode n0=new TreeNode(12);
		TreeNode n6=new TreeNode(15);
		TreeNode n7=new TreeNode(20);
		root.left=n4;
		root.right=n6;
		n4.left=n2;
		n4.right=n3;
		n3.right=n5;
		n6.left=n0;
		n6.right=n7;
        ArrayList<Integer> res=new ArrayList<Integer>();
        if (root==null)
            return;
        inorderTrav(root, res);
        //System.out.println("Hello, World!");
    }
    static class TreeNode
    {
        TreeNode left;
        TreeNode right;
        int val;
        TreeNode(int v){val=v;}
    }
    private static void inorderTrav(TreeNode node, ArrayList<Integer> res)
    {

if (node.left!=null)
        {
            inorderTrav(node.left,res);
        }
        if (node.right!=null)
        {
            inorderTrav(node.right,res);
        }
        res.add(node.val);
        System.out.print(node.val);
        System.out.print(',');
        return;
    }
}

[ + ] Show input
Compilation time: 0.72 sec, absolute running time: 0.13 sec, cpu time: 0.06 sec, memory peak: 18 Mb, absolute service time: 0.86 sec