Question

对于我的学校，我需要创建一个向任何方向移动bug的方法。我有以下代码：

package Test;

//imports
import java.util.Scanner;
import java.util.Random;

public class test {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        ABug[] BugObj = new ABug[4]; //Creating object BugObj of class ABug
        int loop = 1;
        int i = 0;
        do {
            BugObj[i] = new ABug();  //creating instance
            System.out.println("Please enter the name of the bug:");   
            BugObj[i].name = reader.next(); 
            System.out.println("Please enter the species of the bug:");   
            BugObj[i].species = reader.next(); 
            System.out.println("Please enter the horizontal position of the bug:");   
            BugObj[i].horpos = reader.nextInt();
            System.out.println("Please enter the vertical postion of the bug:");   
            BugObj[i].vertpos = reader.nextInt();   

            System.out.println("_______________ Bug " +(+i+1) + " _______________\n" );
            System.out.println("Name: " + BugObj[i].name);           //Printing bug information out
            System.out.println("Species: " + BugObj[i].species);
            System.out.println("Horizontal Position: " + BugObj[i].horpos);
            System.out.println("Vertical Postion: " + BugObj[i].vertpos + "\n\n");
            move();

            i++;
            System.out.println("Would you like to enter another bug? \n 0-No,  1-Yes\n");
            loop = reader.nextInt();
        } while(loop == 1);
    }

    public static void move() {
        Scanner reader = new Scanner(System.in);
        System.out.println("Would you like this bug to move?\n 0-No,  1-Yes\n");
        if (reader.nextInt() == 0) {
            System.exit(0);
        }
        int r = (int) (Math.random() * (2- -2)) + -2;
        System.out.println(r);
    }
}

class ABug {                 //ABug class
    int horpos, vertpos, energy, id;
    char symbol;
    String species, name;
}

基本上我需要做的就是使用方法中生成的随机数来使用错误位置的值。我是java的新手，我不确定如何做到这一点，或者即使它可能。

Answer 1

由于对象是通过java中的引用传递的，因此您只需将ABug对象传递给move函数并更改horpos，vertpos属性即可。所以

move(BugObj[i]);

和

public static void move(ABug bug){
        Scanner reader = new Scanner(System.in);
        System.out.println("Would you like this bug to move?\n 0-No,  1-Yes\n");
        if (reader.nextInt() == 0)
        {
            System.exit(0);
        }

        int r = (int) (Math.random() * (2- -2)) + -2;

        int originalHorpos = bug.horpos

        int originalVertpos = bug.vertpos

        // Now just change the attributes however you see fit. i am just adding r
        bug.horpos = originalHorpos + r;

        bug.vertpos = originalVertpos + r

        /*by the way, we dont need to use variables for the original values. something like this would also work 

           bug.horpos += r; 
           bug.vertpos += r;

 i just want to explain that in java when you pass objects, they are passed by reference and hence you have access to all of its members.

*/
        System.out.println(r);


    }

另外，您不需要在移动功能中再次声明Scanner对象。您也可以将其传递给移动功能，然后根据需要多次阅读。

如何在main中使用方法变量？

1 个答案: