CODEWITHSUNDEEP
javaternary-operator
bighi
bighi

Reputation: 247

Java ternary operator precedence ? Different outputs given

I have the below code producing this output (no space after -1) ==> "1 3 -14 -15 -1"

int [] arr = {1, 3, Integer.MAX_VALUE, 4, Integer.MAX_VALUE, 5, Integer.MAX_VALUE};
for (int dist : arr) {
    System.out.print((dist == Integer.MAX_VALUE) ? -1 : dist + " ");
}

But if I evaluate the ternary expression separately (as shown below), it gives a different output (what I expected) ==> "1 3 -1 4 -1 5 -1"

int [] arr = {1, 3, Integer.MAX_VALUE, 4, Integer.MAX_VALUE, 5, Integer.MAX_VALUE}; 
for (int dist : arr) {
    int finalDist = (dist == Integer.MAX_VALUE) ? -1 : dist;
    System.out.print(finalDist + " ");          
}

What is going wrong with the first code snippet?

Upvotes: 3

Views: 1878

Answers (3)

Gourav Goutam
Gourav Goutam

Reputation: 81

You missed to put the operation within parenthesis, so it is behaving weirdly, use below code,

try{
        throw new ArithmeticException("Exception Testing...");
    }catch(Exception e){
        String msg = "First Statement : " + (e.getCause() != null ? e.getMessage() : null);

        System.out.println(msg);
     }

In case you need any other help or explanation on this . Please let me know.

Upvotes: -2

Yassin Hajaj
Yassin Hajaj

Reputation: 21975

Here

(dist == Integer.MAX_VALUE) ? -1 : dist + " "

The space will be added only if the condition is false. You should use parantheses to add " " at all times like below.

((dist == Integer.MAX_VALUE) ? -1 : dist) + " "

The ternary operator has only operator precedence over the assignment operators. (See below)

Oracle Site about Operator Precedence

The operators in the following table are listed according to precedence order. The closer to the top of the table an operator appears, the higher its precedence.

enter image description here

Upvotes: 6

mr.celo
mr.celo

Reputation: 585

It's just a simple problem with your parentheses. Try this:

int [] arr = {1, 3, Integer.MAX_VALUE, 4, Integer.MAX_VALUE, 5, Integer.MAX_VALUE};

    for (int dist : arr) {
        System.out.print(((dist == Integer.MAX_VALUE) ? -1 : dist) + " ");
    }

Upvotes: 0

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