我一直收到错误，说 D1D 尚未定义？

Question

I am making a planet exploration text game, where you choose from 5 different planets, each one harder than the one above it, but also more resourceful. I have the Int Variable: "D1D", as the danger value, that is randomised. I have a death screen thing, that activates if D1D = 1, but it keeps saying, that it cant find D1D? (I am using JDoodle)

import java.lang.Math;
import java.util.Scanner;
public class PlanetExplorer {
    public static void main(String[] args) {
        //Planets:
        System.out.println("Explorable Planets: ");
        System.out.println(" ");
        System.out.println("Mars: ");
        System.out.println("Resorces: 50 ");
        System.out.println("Danger: 10%");
        System.out.println(" ");
        System.out.println("Jupiter: ");
        System.out.println("Resorces: 75 ");
        System.out.println("Danger: 50%");
        System.out.println(" ");
        System.out.println("Titan: ");
        System.out.println("Resorces: 50 ");
        System.out.println("Danger: 30%");
        System.out.println(" ");
        System.out.println("Uranus: ");
        System.out.println("Resorces: 100 ");
        System.out.println("Danger: 60%");
        System.out.println(" ");
        System.out.println("Neptune: ");
        System.out.println("Resorces: 150 ");
        System.out.println("Danger: 75%");
        //Detecting the planet
        Scanner Planet1 = new Scanner(System.in);
        String P1 = Planet1.next();
        // D_R = Day (1-5) Resources
        // D_D = Day (1-5) Danger
        //If Mars:
        if ((P1.equals("Mars"))) {
            int min = 1;
            int max = 90;
            int range = max - min + 1;
            int  D1R = 50;
            int D1D = (int)(Math.random() * range) + min;
            
            // If Jupier
        }
        if ((P1.equals("Jupiter"))) {
            int min = 1;
            int max = 50;
            int range = max - min + 1;
            int  D1R = 100;
            int D1D = (int)(Math.random() * range) + min;
            
            //If Titan
        }
        if ((P1.equals("Titan"))) {
            int min = 1;
            int max = 70;
            int range = max - min + 1;
            int  D1R = 50;
            int D1D = (int)(Math.random() * range) + min;
            
            //If Uranus
        }
        if ((P1.equals("Uranus"))) {
            int min = 1;
            int max = 40;
            int range = max - min + 1;
            int  D1R = 60;
            int D1D = (int)(Math.random() * range) + min;
            
            //If Neptune
        }
        if ((P1.equals("Neptune"))) {
            int min = 1;
            int max = 25;
            int range = max - min + 1;
            int  D1R = 150;
            int D1D = (int)(Math.random() * range) + min;
        }
         //Here \|/
        if (D1D = 1) {
            int Mmin = 1;
            int Mmax = 3;
            int Mrange = Mmax - Mmin + 1;
            int Message = (int)(Math.random() * Mrange) + Mmin;
            if (Message == 1) {
            System.out.println("You Died!");
            System.out.println("Better Luck Next Time!");
            }
            else {
                if (Message == 2) {
                    System.out.println("Failure!");
                }
                else {
                    if (Message == 3) {
                        System.out.println("You Died!");
                        System.out.println("Replay?");
                    }
                }
            }
        }





    }
}

Answer 1

you are declaring your variables locally (new within each if-block). After the if-block the variable is gone again.

you should declare the variables before:

public static void main(String[] args) {
    int min, max, range, Message, D1R, D1D;

and the only assign values to them in the if-blocks:

    if ((P1.equals("Neptune"))) {
        min = 1;
        max = 25;
        range = max - min + 1;
        D1R = 150;
        D1D = (int)(Math.random() * range) + min;

you will have some more problems compiling this since the variable names are not consistent, but I hope this will help you.