Java

Inverting value of boolean variable?

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Join Date: Dec 2007

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redZERO

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Inverting value of boolean variable?

Jun 5th, 2009

Hi guys,

I am using boolean variables as flags in a program and i want to be able to invert the value.

for example if the current value is true, then it must be changed to false; doesn't matter if i don't know what the current value is.

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VernonDozier VernonDozier is offline

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Re: Inverting value of boolean variable?

Jun 5th, 2009

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Originally Posted by redZERO

Hi guys,

I am using boolean variables as flags in a program and i want to be able to invert the value.

for example if the current value is true, then it must be changed to false; doesn't matter if i don't know what the current value is.

Use the ! operator.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
        boolean a = true;
        System.out.println (Boolean.toString(a)); // true
        a = !a;
        System.out.println (Boolean.toString(a)); // false
        boolean a = true;
        System.out.println (Boolean.toString(a)); // true
        a = !a;
        System.out.println (Boolean.toString(a)); // false