Java访问类变量？

Question

Below is my program artificial bug. How would i be able to access the coorordinates from main which the user has set, and assign them to an array which is set in the MyClass class, thanks in advance:)

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


public class main {

    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 = 4;
        int i = 0;
        int cycles;
        MyClass worldnew = new MyClass();



        System.out.println("Please enter the number of cycles you wish to run:");   
        cycles = reader.nextInt(); //getting the amount of cycles to be run
        System.out.print("____Current World____\n\n");
        worldnew.printWorld(); //calling method to print out world

        System.out.println("____Key____\n_F_ - Food\n_O_ - Object\n_ _ - Space\nSymbol - Bug");


        do{

            BugObj[i] = new ABug();  //creating instance


            System.out.print("Please enter the symbol which you wish to represent the bug:");
            BugObj[i].symbol = reader.next();
            System.out.print("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("Symbol: " + BugObj[i].symbol);     //Printing bug information out
            System.out.println("Name: " + BugObj[i].name);           
            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(BugObj[i]);


            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(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);
        }



        //get corordinate of bug
        //set map[coor] = symbol
        //print out map


        int r = (int) (Math.random() * (2- -2)) + -2;
        int originalHorpos = bug.horpos;
        int originalVertpos = bug.vertpos;
        bug.horpos = originalHorpos + r;
        bug.vertpos = originalVertpos + r;


        System.out.println("New Horizontal Position: " +bug.horpos );
        System.out.println("New Vertical Postion: " +bug.vertpos);

    }

}

enum Item {
    OBJECT ('O'),FOOD ('F'), SPACE (' ');

    private final char symbol;
    Item(char symbol) {
        this.symbol = symbol;
    }
    char getSymbol() { return symbol; }
}

class MyClass {
    Item[][] map = new Item[15][25];
    public void printWorld() {

        int v, h; //v - vert, h - hor

        for (v=1; v<=15; ++v)
        {
            for (h=1; h<=25; ++h)
            {

                final Item[] items = {Item.OBJECT, Item.FOOD, Item.SPACE, Item.SPACE, Item.SPACE, Item.SPACE, Item.SPACE, Item.SPACE};
                Random random = new Random();
                int selection = random.nextInt(items.length);
                map[v-1][h-1] = items[selection];
                System.out.print(map[v-1][h-1].getSymbol() + "_"); 


            }
            System.out.printf("\n");
        } 
    }
}

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

}

edit

 package buglife; //imports import java.util.Scanner; import java.util.Random; public class main { 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 = 4; int i = 0; int cycles; MyClass worldnew = new MyClass(); System.out.println("Please enter the number of cycles you wish to run:"); cycles = reader.nextInt(); //getting the amount of cycles to be run System.out.print("____Current World____\\n\\n"); worldnew.printWorld(); //calling method to print out world System.out.println("____Key____\\n_F_ - Food\\n_O_ - Object\\n_ _ - Space\\nSymbol - Bug"); do{ BugObj[i] = new ABug(); //creating instance System.out.print("Please enter the symbol which you wish to represent the bug:"); BugObj[i].symbol = reader.next(); System.out.print("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("Symbol: " + BugObj[i].symbol); //Printing bug information out System.out.println("Name: " + BugObj[i].name); 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(BugObj[i], worldnew); 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(ABug bug, MyClass wolrdnew){ 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 x = bug.horpos; int y = bug.vertpos; worldnew.setMap(x,y,bug.symbol()); worldnew.printWorld(); //get corordinate of bug //set map[coor] = symbol //print out map int r = (int) (Math.random() * (2- -2)) + -2; int originalHorpos = bug.horpos; int originalVertpos = bug.vertpos; bug.horpos = originalHorpos + r; bug.vertpos = originalVertpos + r; //bug.horpos += r; //bug.vertpos += r; System.out.println("New Horizontal Position: " +bug.horpos ); System.out.println("New Vertical Postion: " +bug.vertpos); } } //public void smellFood (Direction d){ // int MaxSensingDist = 2; //} //public void getRandomDirectionToMove (Direction d){ // //} //public void getDirectionOfFood (){ //} enum Item { OBJECT ('O'),FOOD ('F'), SPACE (' '); private final char symbol; Item(char symbol) { this.symbol = symbol; } char getSymbol() { return symbol; } } class MyClass { public void setMap(int x, int y, Item symbol) { this.map[x][y] = symbol; } Item[][] map = new Item[15][25]; public void printWorld() { int v, h; //v - vert, h - hor for (v=1; v<=15; ++v) { for (h=1; h<=25; ++h) { //map[0][0] = Item.TREE; //map[0][1] = Item.FOOD; //System.out.print(map[0][0].getSymbol()); //System.out.print(map[0][1].getSymbol()); //final String[] items = {"F", "O", ". ", ". ", ". ", ". ", ". ", ". "}; //Random random = new Random(); //int index = random.nextInt(items.length); //System.out.printf(items[index] + "\\t"); final Item[] items = {Item.OBJECT, Item.FOOD, Item.SPACE, Item.SPACE, Item.SPACE, Item.SPACE, Item.SPACE, Item.SPACE}; Random random = new Random(); int selection = random.nextInt(items.length); map[v-1][h-1] = items[selection]; System.out.print(map[v-1][h-1].getSymbol() + "_"); } System.out.printf("\\n"); } } } class ABug { //ABug class int horpos, vertpos, energy, id; String species, name, symbol; } 

Answer 1

how about just

int x = bug.get(horpos);
int y = bug.get(vertpos);

worldnew.setMap(x,y,bug.getSymbol());

worldnew.printWorld();

and in MyClass, add a new method like

void setMap(int x, int y, String symbol)
{
    this.map[x][y] = symbol;
}

you might need to make some changes to suit your code, but the basic idea remains the same

Edit

you will also need to change the

move(BugObj[i]);

to

move(BugObj[i],worldnew);

and change the definition of your move function as

public static void move(ABug bug, MyClass worldnew)