How to prohibit the use of an incorrectly initiated facility in java

[elysha]

Let's say there are classes like this:

class Parent {
    int p1, p2;
    public Parent(int p1, int p2){
        this.p1 = p1;
        this.p2 = p2;
    }
public void printVars(){
    System.out.printf("%d %d", p1, p2);
}

}
class Child extends Parent{

public Child(int p1, int p2){

super(p1, p2);

}

}

But I need to be in cases where p1 > p2 No use of the class object Child♪
I mean, in an attempt to do this:

public class Main {

public static void main(String[] args) {

    Child child = new Child(2, 1);
    child.printVars();
}

}

make a mistake, for example.
How do you do that?

[morde]

Usually, in such cases, the inspection shall be added to the class designer:

class Child extends Parent {
        public Child(int p1, int p2) {
            super(p1, p2);
            if(p1 > p2)
                throw new IllegalArgumentException("p1 was greater than p2");
        }
    }