Question

我试图弄清楚如何将信息从一种方法传递给main方法。它可能很简单，我只是遗漏了一些东西。请帮忙:)

 public static void main(String[] args) throws IOException {
   String[] name =  stateName();

 public static String[] stateName() throws IOException{
   int numState =0; 
   File file = new File ("stateNames.txt");
   Scanner in = new Scanner(file);
   while (in.hasNextLine()){
      String state = in.nextLine();
       numState++;
   }
   String[] states = new String [numState];
   Scanner reader = new Scanner(file);
   for (int i= 0; i < numState; i++){
    states[i] = reader.nextLine();
   }

   return states; 
}

当我去运行时，我回来了：[Ljava.lang.String; @ 18892539我做错了什么？

Answer 1

实际上，没有错。这正是它应该起作用的方式。

当您尝试使用System.out.println打印数组时，您会得到您提到的那种奇怪的神秘内容。您可以使用

解决此问题

System.out.println(Arrays.toString(name));

而不是

System.out.println(name);

Answer 2

其他方法

String[] name = {"John", "Mike", "Jim"};

// this out put will be like this 
[ John, Mike, Jim ]
System.out.prinln(Arrays.asList(name));


// this way is better for formatting. Prints:
John
Mike
Jim
for (String s : name){
    System.out.println(s);     
}

// or this will print out
John Mike Jim
System.out.println(Arrays.toString(name));

将数组从一种方法传递到另一种方法

2 个答案: