CODEWITHSUNDEEP
javaoperators
N2Vo
N2Vo

Reputation: 51

What is ++== in Java?

  1. Searched this site, found no reference.

  2. Test code:

    int[] test = {0, 1, 2, 3};
System.out.println("test1[3] ++== 0 is " + (test[3] ++== 0));

  3. Result:

test1[3] ++== 0 is false

So it must be some sort of logical operator but I have not been able to find any documentation. Searching the Internet yielded no reference.

Please help? Thanks in advance.

Upvotes: 4

Views: 193

Answers (5)

Yuriy Tsarkov
Yuriy Tsarkov

Reputation: 2568

Since ++ is a post-increment, your actions can be separated as:

  • Compare an element with index 3 and 0 -> test[3] != 0 -> false
  • Increment element with index 3. -> test[3] = test[3] + 1;

So after that in the test[3] will be value 4

Upvotes: 1

Duncan Thacker
Duncan Thacker

Reputation: 5188

It's two operators - increment by one (x++) and test for equality (x==0). You should read it as (x++) == 0.

The tricky thing is that the increment happens after the comparison, so the above means "test if X is zero, then increment X by one."

Upvotes: 1

Ryan Fleck
Ryan Fleck

Reputation: 158

x++==y is equivalent to x++ == y

public class Test {
    public static void main(String args[]) {

        int[] test = {0, 1, 2, 3};
        System.out.println("test1[3] ++== 0 is " + (test[3] ++== 3));
    }
}

test1[3] ++== 0 will equate to false.

test1[3] ++== 3 will equate to true.

Upvotes: 1

Andrei Sfat
Andrei Sfat

Reputation: 8626

The way the text is presented looks like it would be a special case ++==, but in fact you should read it as follows:

test[3]++ == 0

Basically, the result of test[3]++ will be compared (i.e ==) with 0.

And this basically reads as (test[3]=3) == 0, which is false.

The ++ is a postfix operator which is shortcut for value = value + 1.

The == is a comparison between two values.

The text is just badly formatted, that's all.

Upvotes: 7

Paul Whalen
Paul Whalen

Reputation: 451

++ and == are two independent operators. ++ is post-incrementing the value of test[3], then that is being compared to 0.

Upvotes: 3

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