java - main 中的数组引用 main 之外的数组

Question

我试图在我的 main 中创建一个数组，方法是使其与在 main 之外的方法中创建的数组相同。我想不出有什么办法可以做到这一点......

这是我的代码:

public class GRID {     
    public void createGrid() {
        int N = StdIn.readInt();
        int thisarray[][] = new int[N][N];
        for (int x = 0; x < N; x++) {
            for (int y = 0; y < N; y++) {
                int n = (int) (Math.random() * 6 + 1);
                thisarray[x][y] = n;                
            }
        }

    }
    public static void main(String []args){     
        GRID g = new GRID();
        int [][] newArray = //thisarray 
    }
}

Answer 1

您在寻找这个答案吗？我已将方法的返回类型更改为 int[][]在 main 方法中我们可以调用 createGrid获取方法 int[][]

public class GRID {     
    public int[][] createGrid() {
        int N = StdIn.readInt();
        int thisarray[][] = new int[N][N];
        for (int x = 0; x < N; x++) {
            for (int y = 0; y < N; y++) {
                int n = (int) (Math.random() * 6 + 1);
                thisarray[x][y] = n;                
            }
        }
        return thisarray;

    }
    public static void main(String []args){     
        GRID g = new GRID();
        int [][] newArray = g.createGrid();
    }
}

如果你想要newArray基于N然后发送N至createGrid方法。为此，您必须在 createGrid 中添加一个参数方法如下所示。删除StdIn.readInt()来自createGrid方法

public class GRID {     
    public int[][] createGrid(int N) {
        int thisarray[][] = new int[N][N];
        for (int x = 0; x < N; x++) {
            for (int y = 0; y < N; y++) {
                int n = (int) (Math.random() * 6 + 1);
                thisarray[x][y] = n;                
            }
        }
        return thisarray;

    }
    public static void main(String []args){     
        GRID g = new GRID();
        int [][] newArray = g.createGrid(StdIn.readInt());  //new array everytime on the basis of input value.
    }
}