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copied!<p>You can also use HashMap instead of array list.</p> <p>It would be more efficient than linearly checking into ArrayList.</p> <p>You'll have to just check whether you have a start(eg "audi") in a HashMap,if not you can add it to the Graph and also the HashMap,if it is already there in HashMap you can skip adding it both.</p> <pre><code>String a = "{\"rel\": \"AtLocation\", \"weight\": 0.5, \"dataset\": \"/d/dbpedia/en\", \"sources\": [\"/s/dbpedia/3.7\"], \"id\": \"0209765bf7185615ef242513f61ca0f61efe2a04\", \"features\": [\"audi AtLocation -\", \"audi - curitiba\", \"- AtLocation curitiba\"], \"end\": \"curitiba\", \"license\": \"/l/CC/By-SA\", \"uri\": \"/a/[AtLocation/,audi/,curitiba/]\", \"start\": \"audi\", \"context\": \"/ctx/all\", \"surfaceText\": null}"; String b = "{\"rel\": \"AtLocation\", \"weight\": 0.5, \"dataset\": \"/d/dbpedia/en\", \"sources\": [\"/s/dbpedia/3.7\"], \"id\": \"5158d1cfce728efb3e42840d166ec06153a3d77d\", \"features\": [\"audi AtLocation -\", \"audi - ingolstadt\", \"- AtLocation ingolstadt\"], \"end\": \"unite_state\", \"license\": \"/l/CC/By-SA\", \"uri\": \"/a/[AtLocation/,audi/,ingolstadt/]\", \"start\": \"audi\", \"context\": \"/ctx/all\", \"surfaceText\": null}"; JSONParser p = new JSONParser(); JSONObject jsonA = (JSONObject) p.parse( a ); JSONObject jsonB = (JSONObject) p.parse( b ); HashMap<String, Integer> map = new HashMap<String, Integer>(); String start = (String) jsonA.get( "start" ); System.out.println( "Does map contains 'audi' for start:" + map.containsKey( start ) ); if( !map.containsKey( start ) ) { map.put( start, 1 ); System.out.println( "Adding to graph" ); } System.out.println( "Does map contains 'audi' for start:" + map.containsKey( start ) ); start = (String) jsonB.get( "start" ); if( !map.containsKey( start ) ) { map.put( start, 2 ); System.out.println( "Adding to graph" ); } System.out.println( "Does map contains 'audi' for start:" + map.containsKey( start ) ); </code></pre> <p>The Output that i got:</p> <pre><code>Does map contains 'audi' for start:false Adding to graph Does map contains 'audi' for start:true Does map contains 'audi' for start:true </code></pre>

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