Question

我有我的代码，但我不能让我的变量stick（）或scrapMetal（）继续。它的设置是为了给你一个随机数量，但我只能重新计算一个值。我该怎么办？我尝试在方法之外声明变量，但那也没有用！代码：

public void turnOne(){
    System.out.println();
    System.out.println();
    System.out.println();
    System.out.println("You realise that in order to survive, you must leave the planet.");
    System.out.println("You start to look around, thinking of how you could repair your ship.");
    System.out.println("<Press 1 to scavenge, 2 to move north, 3 for east, 4 for south, or 5 for west>");
    System.out.println();
    System.out.println();
    System.out.println();
    Scanner input = new Scanner(System.in);
    int yesno = input.nextInt();
    int drops = ((int)(Math.random() * 5));
    int stick = 0;
    int scrapMetal = 0;
    if (yesno == 1){
        System.out.println("You start to scavenge your surroundings.");
        if (drops == 4){
            System.out.println("You found sticks!");
            stick = ((int)(Math.random() * 6));;
            System.out.println("You now have " + stick + " sticks!");
        }
        else{
            System.out.println("You were not able to find any sticks.");
        }
        drops = ((int)(Math.random() * 9));
        if (drops == 7){
            System.out.println("You found some scrap metal!");
            scrapMetal = ((int)(Math.random() * 4));
            System.out.println("You now have " + scrapMetal + " pieces of scrap metal!");
        }
        else{
            System.out.println("You were not able to find any scrap metal.");
        }
        System.out.println("What would you like to do now?");
    }
}

Answer 1

创建静态类，如：

static class MyParameters {
    int stick;
    int scrapMetal;
    MyParameters(int stick, int scrapMetal) {
        //set variables
    }
    //getters
}

现在从你的方法turnOne你可以返回一个MyParameters实例（而不是void）并使用getter访问这两个值，如：

MyParameters parameters = turnOne();
System.out.println(parameters.get...);

Answer 2

对于要在多个方法之间共享的变量，变量'stick'和'scrapMetal'应该在这些方法之外编码，但在类中包含这些方法。

实施例： -

public class YourProgram
{
    int stick;
    int scrapMetal;

    //Maybe Some constructors here...

    public void turnOne()
    {
        //DO NOT declare variables stick and scrapMetal here again.
        //Your above code goes here....
    }

    public void someOtherMethod()
    {
        //DO NOT declare variables stick and scrapMetal here again.
        //Some code goes here which uses stick and/or scrapMetal variables...
    }

    //Probably some more methods and other code blocks go here...
}

如何从一种方法获取值到另一种方法

2 个答案: