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Which of the following are true statements?

  1. The 

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Practice Objects and Collections –

Which of the following are true statements?

  1. The Iterator interface declares only three methods: hasNextnext and remove.
  2. The ListIterator interface extends both the List and Iterator interfaces.
  3. The ListIterator interface provides forward and backward iteration capabilities.
  4. The ListIterator interface provides the ability to modify the List during iteration.
  5. The ListIterator interface provides the ability to determine its position in the List.

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.