Question

我试图将计数器变量读入另一个方法（printPartiallyFilledArray），以便计算和打印数组中正确数量的字符串元素。但是每当我尝试编译时，它都会说我无法找到计算变量。我怎样才能使第二种方法知道计数器变量的值？

public static void main(String [] args)
{
    // Instantiate a String array that can contain 10 items.
    Scanner keyboard = new Scanner(System.in);
    int ARRAY_SIZE = 10;
    String[] array = new String[ARRAY_SIZE];
    int counter = 0;


    // Read names of subjects into this array
    // and count how many have been read in.
    // There may be fewer than 10.
    System.out.println("Please enter a subject name or enter q to quit: ");
    String subject = keyboard.nextLine(); 

    while(subject.equals("q")!=true && counter<ARRAY_SIZE)
    {   
        array[counter] = subject;
        counter++;
        System.out.println("Please enter a subject name or enter q to quit: ");
        subject = keyboard.nextLine();

    }

    // Call printPartiallyFilledArray to print the names in the array.
   printPartiallyFilledArray(array);

}


/**
 * Method printPartiallyFilledArray prints the String values 
 * in a partially-filled array, one per line.  Only the 
 * significant items in the array should be printed.
 * 
 * @param array the array of Strings to be printed on the screen
 * @param count the number of items in the partially-filled array
 */
    public static void printPartiallyFilledArray(String[] array)
    {

     System.out.println("The array elements: ");
        for (int i = 0; i < counter; i++){
        System.out.println(array[i]); }

    }

}

Answer 1

有两种方法可以告知方法计数器的值：

在主函数之外全局定义变量计数器。这样就可以随时了解全局更新的计数器变量的值。

例如：

public class Solution{
public static int counter =0;

    public static void main(String[] args){
    ---do things as before----
    }

    public static void printPartiallyFilledArray(String[] array){
    ---do things as before----
    }
}

通过将函数参数重新定义为：将计数器的值传递给函数printPartiallyFilledArray：
```
printPartiallyFilledArray(String[] array, int counter)
```

并通过调用

printPartiallyFilledArray(array, counter);

Answer 2

您也可以使用

传递计数器变量

public static void printPartiallyFilledArray(String[] array, int counter)

并使用它。

试图将int计数器读入字符串方法[java]

2 个答案: