Question

How do you put an if...else statement within a for statement?

This is the code:

// This is within a actionListener. When ever I press a button, this happens.
for (int i = 0; i < booleanVariable.length; i++) {
    //length is 8
    System.out.println("booleanVariable is" + booelanVariable[i]);
    if (booleanVariable[i] = true) {
        booleanVariable[i] = false;
        System.out.println("booleanVariable was true")
        break;
    } else {
        System.out.println(" booleanVariable is false");
    }
}

This is the output over 3 presses:

booleanVariable is true
booleanVariable was true
//correct    


booleanVariable is false
booleanVariable was true
//incorrect.    

booleanVariable is false
booleanVariable was true
//incorrect

This means that, for some reason, even if booleanVariable is false, the output says is true, which is false.

What I’ve found:

• Without the break; statement, the program goes around the for all 8 times and outputs exactly the same as without a break, only incorrect values another 5 times.

What I’ve tried:

• Changing the if from true to false (out of desperation)
• If within a While within a For
• else, else if
• case switch

Normally, I’d just use a switch, but I’m using booleans, and booleans dont work is switches.

If someone knows the answer, I’d be forever grateful. Thanks.

Answer 1

Change your

if (booleanVariable[i] = true) {

to

if (booleanVariable[i] == true) {

You need to use == operator for comparison. One = sets the value to true which returns always true.
You can also change it to

if (booleanVariable[i]) {