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		 JSONObject jsonObj = JSONObject.fromObject(json); 
Object obj = jsonObj.getJSONArray("data").getJSONObject(0).get("value"); 
if(obj instanceof JSONObject || obj instanceof  JSONArray) { 
  System.out.println("json format string"); 
} 
else{ 
  System.out.println("not json format string"); 
} 
				
		
		
		
		
		
		
		
		
	
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