Day 11 | Guess the output | Java Interview Questions | #corejava #java #springboot

Day 11 | Guess the output | Java Interview Questions | #corejava #java #springboot

Output: 11511

Explanation: The string concatenation operator works as follows: if both the operands are numbers, it performs the addition; otherwise it concats the arguments by calling the toString() method if needed. It evaluates from left to right. Hence, the expression in the program results in the string 115110.

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[darkdaysss]

It should be 115110.
Why though?
The statements in lines 3 and 4 can be expanded as such:
int result1 = 1 + 10; // 11
String result2 = result1 + new String("5"); // „115“
String result3 = result2 + 1; // „1151“
String result4 = result3 + 10; // „115110“
System.out.println(result4);
Also just as an aside don’t use the String copy constructor unless you need a copy – which most of the time you won’t.