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/* package whatever; // don't place package name! */
 
import java.io.*;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
 
import com.google.gson.Gson;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static String SPACE = " ";
	static Gson gson = new Gson();
	static Json3 innerchild = new Json3();
	public static void main (String[] args) throws java.lang.Exception
	{
	String line = "0 senior 3 excellent 4 high no";
		JSONParser parser = new JSONParser();
		JSONObject json = null;
		Json2 leaf = new Json2();
		Json3 child = new Json3();
		String[] parts = line.split(" ");
		int len = parts.length;
		String leafNode = parts[len - 1];
		child.setAttributeIndex(Integer.parseInt(parts[0]));
		child.setAttributeName(parts[1]);
		JSONArray arr = new JSONArray();
		if (len == 3) {
			leaf.setAttribute(leafNode);
			leaf.setLeaf(true);
			leaf.setChildren(arr);
			json = (JSONObject) parser.parse(gson.toJson(leaf));
			child.setChildren(json);
 
		} else {
			for (int i = 2; i < parts.length - 1; i++) {
				if (len != i) {
					if (i == 3) {
						innerchild.setAttributeIndex(Integer.parseInt(parts[i - 1]));
							innerchild.setAttributeName(parts[i]);
							leaf.setAttribute(leafNode);
							leaf.setLeaf(true);
							json = (JSONObject) parser.parse(gson.toJson(leaf));
							innerchild.setChildren(json);
							arr.add(innerchild);
							leaf.setChildren(arr);
							leaf.setLeaf(false);
					} else {
						leaf.setAttribute(parts[i]);
						leaf.setChildren(arr);
						json = (JSONObject) parser.parse(gson.toJson(leaf));
						child.setChildren(json);
					}
				}
			}
		}
		if(parts.length != 3){
			arr = new JSONArray();
			arr.add(innerchild);
			leaf.setChildren(arr);
			json = (JSONObject) parser.parse(gson.toJson(leaf));
			child.setChildren(json);
		}
 
		 System.out.println(gson.toJson(child));
	}
}

Main.java:4: error: package org.json.simple does not exist
import org.json.simple.JSONArray;
                      ^
Main.java:5: error: package org.json.simple does not exist
import org.json.simple.JSONObject;
                      ^
Main.java:6: error: package org.json.simple.parser does not exist
import org.json.simple.parser.JSONParser;
                             ^
Main.java:7: error: package org.json.simple.parser does not exist
import org.json.simple.parser.ParseException;
                             ^
Main.java:9: error: package com.google.gson does not exist
import com.google.gson.Gson;
                      ^
Main.java:15: error: cannot find symbol
	static Gson gson = new Gson();
	       ^
  symbol:   class Gson
  location: class Ideone
Main.java:16: error: cannot find symbol
	static Json3 innerchild = new Json3();
	       ^
  symbol:   class Json3
  location: class Ideone
Main.java:15: error: cannot find symbol
	static Gson gson = new Gson();
	                       ^
  symbol:   class Gson
  location: class Ideone
Main.java:16: error: cannot find symbol
	static Json3 innerchild = new Json3();
	                              ^
  symbol:   class Json3
  location: class Ideone
Main.java:20: error: cannot find symbol
		JSONParser parser = new JSONParser();
		^
  symbol:   class JSONParser
  location: class Ideone
Main.java:20: error: cannot find symbol
		JSONParser parser = new JSONParser();
		                        ^
  symbol:   class JSONParser
  location: class Ideone
Main.java:21: error: cannot find symbol
		JSONObject json = null;
		^
  symbol:   class JSONObject
  location: class Ideone
Main.java:22: error: cannot find symbol
		Json2 leaf = new Json2();
		^
  symbol:   class Json2
  location: class Ideone
Main.java:22: error: cannot find symbol
		Json2 leaf = new Json2();
		                 ^
  symbol:   class Json2
  location: class Ideone
Main.java:23: error: cannot find symbol
		Json3 child = new Json3();
		^
  symbol:   class Json3
  location: class Ideone
Main.java:23: error: cannot find symbol
		Json3 child = new Json3();
		                  ^
  symbol:   class Json3
  location: class Ideone
Main.java:29: error: cannot find symbol
		JSONArray arr = new JSONArray();
		^
  symbol:   class JSONArray
  location: class Ideone
Main.java:29: error: cannot find symbol
		JSONArray arr = new JSONArray();
		                    ^
  symbol:   class JSONArray
  location: class Ideone
Main.java:34: error: cannot find symbol
			json = (JSONObject) parser.parse(gson.toJson(leaf));
			        ^
  symbol:   class JSONObject
  location: class Ideone
Main.java:45: error: cannot find symbol
							json = (JSONObject) parser.parse(gson.toJson(leaf));
							        ^
  symbol:   class JSONObject
  location: class Ideone
Main.java:53: error: cannot find symbol
						json = (JSONObject) parser.parse(gson.toJson(leaf));
						        ^
  symbol:   class JSONObject
  location: class Ideone
Main.java:60: error: cannot find symbol
			arr = new JSONArray();
			          ^
  symbol:   class JSONArray
  location: class Ideone
Main.java:63: error: cannot find symbol
			json = (JSONObject) parser.parse(gson.toJson(leaf));
			        ^
  symbol:   class JSONObject
  location: class Ideone
23 errors

Standard output is empty