1 answer

Java question! You are given the following class: class X {private int a, b, c; ...}...

Question:

You are given the following class: class X {privat

java question!

You are given the following class: class X {private int a, b, c; ...} The ... indicates that the class may contain methods, constructors, but not fields. What can you say about the correctness of the following implementation of structural equality: public boolean eq (X x) {return this, a = x.a && this. b = x. b;}

Answers

public boolean eq(X x)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

  • It is reflexive for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

above structural equlity is TRUE

.

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