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hashCode() method 

x = 0; 

if (x1.hashCode() != x2

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Practice hashCode() method – 

x = 0; 

if (x1.hashCode() != x2.hashCode() )  

  x = x + 1; 

if (x3.equals(x4) )  

  x = x + 10; 

if (!x5.equals(x6) ) 

  x = x + 100; 

if (x7.hashCode() == x8.hashCode() )  

  x = x + 1000; 

System.out.println("x = " + x);

and assuming that the equals() and hashCode() methods are property implemented, if the output is “x = 1111“, which of the following statements will always be true?

Which two statements are true about comparing two instances of the

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Practice hashCode() method –

Which two statements are true about comparing two instances of the same class, given that  the equals()  and  hashCode() methods have been properly overridden?

  1. If the equals() method returns true, the hashCode() comparison == must return true.
  2. If the equals() method returns false, the hashCode() comparison != must return true.
  3. If the hashCode() comparison == returns true, the equals() method must return true.
  4. If the hashCode() comparison == returns true, the equals() method might return true.

Which of the following statements about the hashcode()

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Practice hashCode() method –

Which of the following statements about the hashcode() method are incorrect?

  1. The value returned by hashcode() is used in some collection classes to help locate objects.
  2. The hashcode() method is required to return a positive int value.
  3. The hashcode() method in the String class is the one inherited from Object.
  4. Two new empty String objects will produce identical hashcodes.
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