equals vs ==

If equals method is used to compare Object type and primitive type variables, some wrong results could be occurred which are shown below as yellow color. If == operator is used there is no problem.

If you want to be sure if the comparison is right, the best way is to convert all variables into same data type.

Example 1:

Integer i = 5;

short s = 5;

System.out.println(i.equals(s)); false

System.out.println(i.equals(5)); true

System.out.println(i == 5); true

System.out.println(i == s); true

Example 2:

Long l = 5L;

int i = 5;

System.out.println(l.equals(i)); false

System.out.println(l.equals(5)); false

System.out.println(l.equals(5L)); true

System.out.println(l == 5); true

System.out.println(l == 5L); true

System.out.println(l == i); true

Example 3:

Short s1 = 5;

short s2 = 5;

System.out.println(s1.equals(s2)); true

System.out.println(s1.equals(5)); false

System.out.println(s1 == 5); true

System.out.println(s1 == s2); true