尝试使用地形表示制作围栏地图

Question

现在我想用 1 和 0 制作一个栅栏来表示地形。 1 将是栅栏，0 将是空白空间。这是我的代码

package assignment_2;

public class Fencing {

public static void main(String[] args) {

    boolean b = true;
    int i;
    int j;
    int[] [] map = 

        {
                {0, 1, 1, 0},
                {1, 2, 1, 1},
                {1, 1, 4, 0},
                {1, 1, 0, 0}
        };
    for (i = 0; i < 4; i++){
        for (j = 0; j < 4; j++){
            if (map[i][j] != 1 && map[i][j] != 0){
                b = false;

                if (b = false){
                System.out.println("Map of the land owned:");
                System.out.println(map[i][j]);
                System.out.println("Map does not have the correct format");
                System.out.println("--> A value of " + map[i][j] + " was found at " + i + "," + j);

                }
                else{
                System.out.println("Map of the land owned: ");
                System.out.println(map[i][j]);
                System.out.println("The map is valid");
                return;
                }   
            }
        }       
    }
}
}

我试图让代码做的是显示地图是否有效。如果地图不是由 0 或 1 组成，则该地图无效，但由于某种原因，此代码使地图无论其中有什么都有效，并且在地图中显示第一个错误，而不是打印出整个地图地图。我试图让最终结果看起来像这样：

Map of land owned

0110
1211
1141
1100

The map is not valid
A value of 2 was found at 1,1
A value of 4 was found at 2,2

这就是现在的结果

Map of the land owned: 
2
The map is valid

似乎由于某种原因忽略了 b 布尔值，有人知道如何修复它吗？

编辑：b 问题已经修复，这就是我现在得到的

Map of the land owned:
2
Map does not have the correct format
--> A value of 2 was found at 1,1

Answer 1

它忽略if (b = false) 的原因是因为您使用的是赋值运算符，而不是条件运算符。这将始终评估为真，因为您正在分配值，从而使其成为真。

将其更改为 if (b == false) 或 Balint 指出的 (!b)。

如果你想打印出整个地图，你可以这样做：

int indexI = 0;
int indexJ = 0;     

for (i = 0; i < 4; i++){
        for (j = 0; j < 4; j++){
            System.out.println("Map of the land owned:");
            System.out.println(map[i][j]);
            if (map[i][j] != 1 || map[i][j] != 0){
                b = false;
                indexI = i;
                indexJ = j; 
            }

        }
 }       

if (b == false){
System.out.println("Map does not have the correct format");
System.out.println("--> A value of " + map[indexI][indexJ] + " was found at " + indexI + "," + indexJ);

}
else{
System.out.println("Map of the land owned: ");
System.out.println("The map is valid");
return;
}