在方法之外声明整数？

Question

    import java.util.Scanner;
public class InputTest {
static void monster() {
    System.out.println("You ran into a monster!");
    System.out.println("He did 10 damage!");
    health -= 10;
    System.out.println("You have " + health + " health left!");
}
static void potion() {
    System.out.println("You ran into a potion!");
    System.out.println("It healed 10 damage!");
    health += 10;
    System.out.println("You have " + health + " health left!");
}
static void bag() {
    System.out.println("You ran into a bag!");
    System.out.println("It did... Nothing!");
}
static void random() {
    double random = Math.random();
    if(random >= 0 && random <= 0.33) {
        monster();
    } else if(random >= 0.24 && random <= 0.66) {
        potion();
    } else {
        bag();
    }
}
static void turn() {
    System.out.println("Do you want to go left or right?");
    Scanner turn = new Scanner(System.in);
    String leftOrRight = turn.nextLine();
    if(leftOrRight.equals("Right")) {
        System.out.println("You turned right and...");
        random();
    } else if(leftOrRight.equals("Left")){
        System.out.println("You turned left and...");
        random();
    } else {
        System.out.println("You entered an invalid answer...");
        System.exit(0);
    }
}
public static void main(String[] args) {
    int health = 50;
    for(int i = 0; i < 10; i++) {
        turn();
    }
    System.out.println("You won!");
    }
}

这是非工作代码。 怪物（）;和健康（）;方法是我遇到麻烦的方法。 它输出我没有宣称'健康'。 我明白为什么说这个，有没有办法解决这个问题。 它只是不允许我在方法中使用健康整数。 如你所见，它应该采取健康并减去10。

Answer 1

使health成为类级静态变量。

import java.util.Scanner;
public class InputTest {
     private static int health = 50;

     /*rest of the methods as they are*/

}

Answer 2

请尝试以下代码：

import java.util.Scanner;

public class Test {
    private static int health = 50;

    public static void main(String[] args) {

        for (int i = 0; i < 10; i++) {
            turn();
        }
        System.out.println("You won!");
    }

    static void monster() {
        System.out.println("You ran into a monster!");
        System.out.println("He did 10 damage!");
        health -= 10;
        System.out.println("You have " + health + " health left!");
    }

    static void potion() {
        System.out.println("You ran into a potion!");
        System.out.println("It healed 10 damage!");
        health += 10;
        System.out.println("You have " + health + " health left!");
    }

    static void bag() {
        System.out.println("You ran into a bag!");
        System.out.println("It did... Nothing!");
    }

    static void random() {
        double random = Math.random();
        if (random >= 0 && random <= 0.33) {
            monster();
        } else if (random >= 0.24 && random <= 0.66) {
            potion();
        } else {
            bag();
        }
    }

    static void turn() {
        System.out.println("Do you want to go left or right?");
        Scanner turn = new Scanner(System.in);
        String leftOrRight = turn.nextLine();
        // turn.close();
        if (leftOrRight.equals("Right")) {
            System.out.println("You turned right and...");
            random();
        } else if (leftOrRight.equals("Left")) {
            System.out.println("You turned left and...");
            random();
        } else {
            System.out.println("You entered an invalid answer...");
            System.exit(0);
        }
    }
}

Answer 3

见下面的修改后的代码。

import java.util.Scanner;

public class InputTest {
    private static int health = 50;
    static void monster() {
        System.out.println("You ran into a monster!");
        System.out.println("He did 10 damage!");
        health -= 10;
        System.out.println("You have " + health + " health left!");
    }

    static void potion() {
        System.out.println("You ran into a potion!");
        System.out.println("It healed 10 damage!");
        health += 10;
        System.out.println("You have " + health + " health left!");
    }

    static void bag() {
        System.out.println("You ran into a bag!");
        System.out.println("It did... Nothing!");
    }

    static void random() {
        double random = Math.random();
        if (random >= 0 && random <= 0.33) {
            monster();
        } else if (random >= 0.24 && random <= 0.66) {
            potion();
        } else {
            bag();
        }
    }

    static void turn() {
        System.out.println("Do you want to go left or right?");
        Scanner turn = new Scanner(System.in);
        String leftOrRight = turn.nextLine();
        if (leftOrRight.equals("Right")) {
            System.out.println("You turned right and...");
            random();
        } else if (leftOrRight.equals("Left")) {
            System.out.println("You turned left and...");
            random();
        } else {
            System.out.println("You entered an invalid answer...");
            System.exit(0);
        }
    }

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            turn();
        }
        System.out.println("You won!");
    }
}

此致