Ternary operator with multiple condtions in Java throwing error

Question

This is my ternary condition in Java.

new_user_id.equals(userid) && new_key.equals(key) && !new_value.equals(value) ? updateValue() : System.out.println("New value already exists in DB");

I'm trying to match three conditions and call updateValue() function if all three conditions gets true. But still its throwing error "The left-hand side of an assignment must be a variable". Any ideas?

Throw everything from 'new' to right before '?' in parenthesis () — z7r1k3, Feb 11 '16 at 04:34
ternary statements are meant to be used in assignments. This needs to be changed to an `if` statement — Tah, Feb 11 '16 at 04:39

score 1 · Answer 1 · answered Feb 11 '16 at 04:35

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JLS-15.25. Conditional Operator ? : says (in part)

It is a compile-time error for either the second or the third operand expression to be an invocation of a void method.

answered Feb 11 '16 at 04:35

Elliott Frisch

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Can you tell me what should be written? – Syed Feb 11 '16 at 04:36
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You can't use `System.out.println` and you can't call a `void` method (with a ternary). You could use an `if-else`. – Elliott Frisch Feb 11 '16 at 04:37
But I want to call a function if it returns true. I can write if-else, but I dont want to use it – Syed Feb 11 '16 at 04:38
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You can call a function, but it must return a value (and it must be of the same type for both the second and third operand expressions). – Elliott Frisch Feb 11 '16 at 04:39
So, the function should return a boolean value, right? – Syed Feb 11 '16 at 04:41
Any value, as long as both operations return the same type. – Majora320 Feb 11 '16 at 04:43

score 1 · Answer 2 · answered Feb 11 '16 at 04:40

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The ternary operator is used for conditional variable assignment or something like:

System.out.println("You have " + items + (items == 1 ? "item." : "items."));

Therefore, it must return something. Use an if statement instead.

answered Feb 11 '16 at 04:40

Majora320

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Ternary operator with multiple condtions in Java throwing error

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