android java --key is same but containsKey return false

Question

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);
        }
    }

Answer 1

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

Hope this helps !