Java - jak rozpocząć działanie kodu od nowa jeżeli warunek nie jest spełniony?

Question

Witam . Co powinienem zrobić , aby program zaczynał działanie od nowa , jeżeli ten warunek będzie spełniony?

 

if ((number < 0) || (number1 < 0) || (number2 < 0) ) {
            System.out.println("The length of a side can't be a negative number");

        }

Całość kodu: 

 

package com.company;

import java.util.Scanner;
import java.lang.Math;

import static java.lang.Math.pow;

public class Main {
    public static void triangle() {
        System.out.println("Enter the length of the first side of the square triangle: ");
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        int number = Integer.parseInt(input);

        System.out.println("Enter the length of the second side of the square triangle: ");
        Scanner scanner1 = new Scanner(System.in);
        String input1 = scanner1.nextLine();
        int number1 = Integer.parseInt(input1);

        System.out.println("Enter the length of the third side of the square triangle: ");
        Scanner scanner2 = new Scanner(System.in);
        String input2 = scanner2.nextLine();
        int number2 = Integer.parseInt(input2);

        if ((number < 0) || (number1 < 0) || (number2 < 0) ) {
            System.out.println("The length of a side can't be a negative number");

        }


        double power1 = pow(number, 2);
        double power2 = pow(number1, 2);
        double power3 = pow(number2, 2);

        if ((power1 + power2 == power3) || (power2 + power3 == power1) || (power1 + power3 == power2)) {
            System.out.println(true);
        } else {
            System.out.println(false);
        }
    }

        public static void main (String[]args){
            // write your code here
            triangle();

        }
    }

 

 

Answer 1

Aby powtarzać kod dopóki nie zostanie spełniony jakiś warunek musisz opakować go w pętlę
np.
 

while (true) {
    if ((number < 0) || (number1 < 0) || (number2 < 0) ) {
        System.out.println("The length of a side can't be a negative number");
    }
    else {
        break; // przerywamy pętlę
    }
}

 

Comments

A dałoby się tak?

while (!((number < 0) || (number1 < 0) || (number2 < 0)))
{
        System.out.println("The length of a side can't be a negative number");
}

 

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whie true if i break w else to złe podejście

bierz rozwiązanie @KamQiX