Java: == in print statement gives different answers [duplicate]

System.out.println("Result .... " +a==b); -> the result string will be appended with 'a' and then compares with b so it results false.

Order of operations:

"Result .... " + a==b 

is equivalent to

("Result .... " +a) == b 

which will be false since the two strings are not the same reference.

The explanation for this is that the + addition operator has a higher precedence than == logical equivalence.

The expression a == b is returning true in your second statement due to interning, in which a and b actually refer to same string object.

Click here for a link to Oracle's table of operator precedence in Java.

1. Forgot checking equality by == in java. In Java this operation checks equality of object link. Additionally it is applicable for checking equality of simple numbers. You should use .equals method

   String a = "abc"; String b = new String(a); System.out.printLn(a == b);//false System.out.println(a.equals(b));//true 

2. Learn about operation order in java

It is because in "Result .... " +a==b it first add "Result .... " with a and then == to b. If you write like this "Result .... " +(a==b), then it will be OK.

In the first statement, you're comparing "Result .... " + a with b. In the second one, you're comparing a with b, hence the difference. Change your first statement as follows:

 System.out.println("Result .... " + (a==b)); 

And keep in mind that strings should be compared using the equals() method instead of ==.

System.out.println("Result .... " +a==b);

String Result is appended with 'a' and then compares with b so it provides false. (Result .... a == b) which is false.

Follow this link to understand precedence of operators in java and this.

Operator + has more precedence than == operator. 

try adding brackets, you will see the diff. Bracket is evaluated separately.

public static void main(String[] args) { String a = "abc"; String b = "abc"; System.out.println("Result .... " + (a == b)); // false System.out.println(a == b); // true} } 

output

Result .... true true