Java 扫描器循环？
我正在制作一个迷宫求解器。由于某种原因，每次该行都标有“-->”达到时，输出“输入高度：”。就像那条线（到达时不运行）以某种方式使方法循环。
private void makeMap() {
Map map; //used to convert the char array into a graph
int height; //the height of the map by user input
char[][] array; //used to store the char map
System.err.println("Enter height: ");
height = scanner.nextInt(); //gets and stores the height from the user
array = new char[height][]; //initializes the map with input height
for(int i=0; i<height; i++) { //adds row by row to the map array
System.err.print("Enter next line of map: ");
array[i] = scanner.next().toCharArray();
}
--> map = new Map(array); //initializes the map by passing the char array
graph = map.makeGraph(); //creates a graph from the char array
}
我用“-->”标记我相信我的问题出在哪里。我在标记行之前放置的任何代码都将执行，但是一旦到达该行，它就会循环回到该方法的顶部。下面是 Map 构造函数：
public Map(char[][] passMap) {
adjList = new Vertex[map.length*map[0].length];
map = passMap; //stores the passed map
}
任何帮助都比没有帮助好。我已经在这个问题上呆了好几个小时了。谢谢。
I am making a maze solver. For some reason Everytime the line marked with '-->' is reached, "Enter height: " is outputted. It is like that line (which is not run when it is reached) somehow makes the method loop.
private void makeMap() {
Map map; //used to convert the char array into a graph
int height; //the height of the map by user input
char[][] array; //used to store the char map
System.err.println("Enter height: ");
height = scanner.nextInt(); //gets and stores the height from the user
array = new char[height][]; //initializes the map with input height
for(int i=0; i<height; i++) { //adds row by row to the map array
System.err.print("Enter next line of map: ");
array[i] = scanner.next().toCharArray();
}
--> map = new Map(array); //initializes the map by passing the char array
graph = map.makeGraph(); //creates a graph from the char array
}
I labelled with '-->' where I believe my problem lays. Any code i put before the marked line will execute, but as soon as that line is reached it loops back to the top of this method. Below is the Map constructor:
public Map(char[][] passMap) {
adjList = new Vertex[map.length*map[0].length];
map = passMap; //stores the passed map
}
ANY HELP is better than no help. I've been at this for hours. Thanks.
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评论（2）
您的地图变量可能未初始化。更改：
至：
我还将您的
System.err.println()调用更改为System.out.println()。第一个用于错误输出，第二个用于正常控制台输出。Your map variable is probably uninitialized. Change:
To:
I would also change your
System.err.println()calls toSystem.out.println(). The first one is for error output, and the second one for normal console output.为什么不学习使用调试器（这很简单）并在那一行设置一个断点。这会很快给你答案。
Why not learn to use a debugger (it's pretty easy) and just set a breakpoint on that line. That would give you your answer real quick.