java - 调用 toString 方法时遇到问题

Question

我的方法locateLargest()如下所示，是一种查找数组中最大值的坐标的方法。当我尝试在主方法中使用locateLargest 方法调用toString 方法时，出现错误:无法从LocationTest 类型对非静态方法locateLargest(int[][]) 进行静态引用。不知道如何解决这个问题。

import java.util.Scanner;

public class LocationTest {

public static void main(String[] args) {
    Scanner numberInput = new Scanner(System.in);
    System.out.println("Enter the number of rows and columns of the array: ");
    int row = numberInput.nextInt();
    int column = numberInput.nextInt();
    Location l1 = new Location(row, column);
    Location l2 = new Location();
    row = l1.getRow();
    column = l1.getColumn();
    int[][] array = new int[l1.getRow()][l1.getColumn()];
    System.out.println("Please enter the array elements: ");
    for (int r = 0; r < array.length; r++){
        for (int c = 0; c < array[r].length; c++){
            array[r][c] = numberInput.nextInt();
        }//end nested loop

    }//end for loop
    System.out.println(getMax(array));
    System.out.println(locateLargest(array).toString());

}



    public static int getMax(int[][] x){
        int max = Integer.MIN_VALUE;;
        for (int i = 0; i < x.length; i++){
            for (int j = 0; j < x[i].length; j++){

                if (x[i][j] > max)

                    max = x[i][j];
            }
    }
        return max;
    }


    public Location locateLargest(int[][] x){ 
        int maxValue = getMax(x);
        for (int i = 0; i < x.length; i++){
            for (int j = 0; j < x.length; j++)
                if (x[i][j] == maxValue)
                    return new Location(i,j);
        }
        return null;
    }
}
class Location {
private int row;
private int column;

Location(){}//end constructor

Location(int row, int column){
    this.row = row;
    this.column = column;
}//end arg constructor

public int getRow(){
    return this.row;
}

public int getColumn(){
    return this.column;
}

public String toString(){
    return "[" + row + "][" + column + "]";
}

}

Answer 1

函数 locateLargest() 是非静态的，因此您无法从 static 函数(例如 main())调用它。将 locateLargest() 更改为 static，因为它似乎没有使用任何实例变量。

您看到编译错误的原因是不允许静态函数调用非静态函数。