无法从int转换为boolean。 Java错误（新案例）

Question

I'm working in TicTacToe gui program in java. I have created a class PlayerTurn . In order to check for the player turn I used player = (player%2) ? 1 : 2; player = (player%2) ? 1 : 2; in java. I used in a C++ project and it worked fine but in Java I get error Type Mismatch : Cannot convert from int to boolean I have declared player as an int.

Answer 1

You need to compare the result of the modulo operation to something, since the condition in a ternary expression has to be a boolean . I am guessing you want to compare with 1 :

player = (player%2 == 1) ? 1 : 2;

Answer 2

In the ternary operator:

    result = testCondition ? value1 : value2

testCondition has to be a boolean value. If testCondition evaluates to true , then result = value1 . Else, result = value2 .

Therefore, player = (player%2) ? 1 : 2 player = (player%2) ? 1 : 2 doesn't work.( Type Mismatch : Cannot convert from int to boolean ) (player%2) is an int, not a boolean value. Change it to:

player = (player%2 == 1) ? 1 : 2

Translates to:

Is player%2 == 1?
   Yes?  Then player = 1
   No?   Then player = 2

Here's a good example:

min_Val = a < b ? a : b;