AssertTest.java

public class AssertTest {
   
    static boolean isAdult(int age){
        assert age>=0 && age <=150:"Invalid age "+age;
        if(age>18){
            return true;
        }else{
            return false;
        }
    }
    
    public static void main(String[] args) {
        int age=-12;
        boolean adult=isAdult(age);
        System.out.println("Adult : "+adult);
    }
}