void () { Character c1 = '1'; Character c2 = '2'; Object o = '3'; // A cast on either operand is required to force a primitive comparison; not redundant. System.out.println((char) c1 == c2); System.out.println(c1 == (char) c2); // If one operand is a primitive, and the other is a wrapper, the wrapper need not be cast. System.out.println((<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1 == '*'); System.out.println('*' == (<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1); // The cast on the Object is required to force a primitive comparison; not redundant. System.out.println((char) o == '*'); System.out.println('*' == (char) o); // The cast on the Object is required to force a primitive comparison; not redundant. System.out.println((Character) o == '*'); System.out.println('*' == (Character) o); // The cast on the Object triggers an implicit unboxing of the wrapper; not redundant. System.out.println((char) o == c1); System.out.println(c1 == (char) o); // A cast on the Object is required for a primitive comparison, but the wrapper cast is redundant. System.out.println((char) o == (<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1); System.out.println((<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1 == (char) o); // Although a reference comparison, the cast on the wrapper has a side effect; not redundant. System.out.println(o <warning descr="Comparison between Object and primitive is illegal and is accepted in Java 7 only">==</warning> (char) c1); System.out.println((char) c1 <warning descr="Comparison between Object and primitive is illegal and is accepted in Java 7 only">==</warning> o); }