Methods that return boolean are useful for checks and validations. They answer a yes-or-no question and let you use the result directly in if statements.
public static boolean isEven(int n) {
return n % 2 == 0;
}
You can call this method inside a condition:
if (isEven(4)) {
System.out.println("Even");
}
A common mistake is writing if (isEven(4) == true). Since isEven already returns a boolean, the == true is redundant. Just write if (isEven(4)) directly.
Naming convention matters. Boolean methods should read like a question: isEven, hasPermission, canProceed. When you see if (hasPermission(user)) in code, the intent is immediately clear.