Question

Why doesn't this code let me run it. I just finished it really...

public class ComboLock {

    int secret1, secret2, secret3;
    // secret keys
    int dial1, dial2, dial3;
    // variables used to store dialed ticks
    boolean first, second, third;
    // variables used to store current turn number(how many numbers entered already)
    public ComboLock(int secret1, int secret2, int secret3) {
        super();
        this.secret1 = secret1;
        this.secret2 = secret2;
        this.secret3 = secret3;
        this.dial1 = 0;
        this.dial2 = 0;
        this.dial3 = 0;
        this.first = false;
        this.second = false;
        this.third = false;
        // constructor
    }
    public void reset(){
        this.dial1 = 0;
        this.dial2 = 0;
        this.dial3 = 0;
        this.first = false;
        this.second = false;
        this.third = false;
        // method to rest dials to zero
    }


    public void turnLeft(int ticks){

        if(first){
            this.dial2 = (this.dial1 - ticks)%40;
            this.second = true;
            // when turning left will take place then user may be entering second number,
// if user already moves to left in first attempt then second variable will
// not set to true and open will return false as it should be
// it only works when user already entered the first number

        }

    }


    public void turnRight(int ticks){

        if(!first){
            this.dial1 = ticks%40;
            this.first = true;
        }

        else{
            this.dial3 = (this.dial2 + ticks)%40;
            this.third = true;
        }

    }

    public boolean open(){

        if(this.first && this.second && this.third && this.dial1==this.secret1
                && this.dial2==this.secret2 && this.dial3==this.secret3){
            return true;
        }
        return false;
        // check if all numbers are entered and are correct then open the lock else deny

    }

    public static void main(){
        ComboLock lock = new ComboLock(15, 35, 20);
        lock.turnRight(15);
        lock.turnLeft(20);
        lock.turnRight(25);
        System.out.println(lock.open());
        lock.reset();
        lock.turnRight(15);
        lock.turnLeft(20);
        lock.turnRight(24);
        System.out.println(lock.open());

    }
}

Answer 1

Explanation:

In JAVA main method is written as

public static void main(String[] args){

// Main function body

}

And in your code String[] args is missing from main() method parameter.

Output of your code is:

false

false

Please give feedback!

Thank You!!