test.java

class NumberGenerator{
    private static int counter;
    private int num1;
    static{
        counter=101;
    }

    public NumberGenerator(int num1){
        this.num1 = NumberGenerator.counter-num1;
        NumberGenerator.counter-= num1;
    }

    public static int generateNumber(){
        return NumberGenerator.counter+10;
    }

    public void updateNumber(int val1, int val2){
        if(val1 >= val2){
            NumberGenerator.counter +=(this.num1+val1);
        }
        else
        {
            NumberGenerator.counter+=(this.num1-val2);
        }
    }
}


public class test{
    public static void main(String[] args){
        NumberGenerator numGenObj1 = new NumberGenerator(2);
        numGenObj1.updateNumber(2,4);
        NumberGenerator numGenObj2 = new NumberGenerator(3);

        System.out.println(NumberGenerator.generateNumber());
    }
}