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  • Harsh Vashishth Mar-15-2019 06:27:28 AM ( 2 months ago )

    I have to put values in LinkedHashMap. (because, I want sorting and determinig if there are values already)

    I thought containsKey return true if String values are same like temp and temp2. However, testMap.put(temp2,8); is running.

    I don't know why. If that is not correct answer, How can I store or access values in fast way??

     public class TestClass{
            public String one;
            public String two;
            TestClass(String one, String two){
                this.one=one;
                this.two=two;
            }
        }
        public void testPersonWord(){
            LinkedHashMap<TestClass, Integer> testMap= new LinkedHashMap<>();
            TestClass temp= new TestClass("hdy","hello");
            testMap.put(temp,3);
            TestClass temp2= new TestClass("hdy","hello");
            if(testMap.containsKey(temp2)){
                testMap.replace(temp2,5);
            }else{
                testMap.put(temp2,8);
            }
        }
  • Imran Malik Mar-15-2019 06:31:11 AM ( 2 months ago )

    Here is containKey method. The hashCode is used for comparing so definitely the hashCode of two object is difference so it can not be equal.
    You can consider to use primitive key or use TestClass.getOne() to compare String.

    /**
     * Returns true if this map contains a mapping for the
     * specified key.
     *
     * @param   key   The key whose presence in this map is to be tested
     * @return true if this map contains a mapping for the specified
     * key.
     */
    public boolean containsKey(Object key) {
        return getNode(hash(key), key) != null;
    }

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