为什么我的程序不使用我写的方法？

Question

给定的程序编译，但不以我想要的方式运行。我认为这不是应用我写的方法。有任何想法吗？

import java.util.Scanner; 
public class Assignment_1_q1 { 

    static Scanner input = new Scanner(System.in); 
    public static int i; 
    public static int counter; 
    public static int n; 

    //main method 
    public static void main(String[] args) { 

     System.out.println("Enter n's value: "); 
     n = input.nextInt(); //Prompts the user to input the integer number n. 
     int[] table = new int[10]; //Create an array of size 10. 
     getArrayValues(table); //Calls the first method 
     matchCriteria(table, counter, n); //Calls the second methods 
     System.out.println("There is "+ n +"numbers greater than n!"); //display the result. 

    } 
    //the first method to input array values from the user, 
    //allows nonnegative numbers only to be stored into the array. 
    public static int[] getArrayValues(int table[]){ 

     while (table[i] < 0) 
     System.out.println("Pleas try a nonnegative number!"); 

     for (int i = 0; table[i] < table.length; i++){   
      System.out.println("Enter an array value: "); 
      table[i] = input.nextInt();   
     } 
     return table; 
    } 
    // the second method determines how many of array values are greater than the value of n. 
    public static int matchCriteria(int array[], int counter, int n){ 

     counter = 0; 

     for(int i = 0; i < array.length && i > n;) { 
      if (i > n) counter++; 
     } 
     return counter; 
    } 

} 

Answer 1

就像Elliott说的那样，你实际上并没有对调用方法的数据做任何事情。你必须根据你想要做的事情来使用它。

Answer 2

你需要getArrayValues（）表的结果保存为这样：

table = getArrayValues(table); 

int newcounter = matchCriteria(table, counter, n); 

最重要的是，你实现了循环使用表[I]，而不是我的选择标准。这将是更好地做一个while循环：

考虑重构这样：

for (int i = 0; i < table.length; i++){   
     System.out.println("Enter an array value: "); 
     table[i] = input.nextInt(); 
     while(table[i] < 0) { 
      System.out.println("Pleas try a nonnegative number!"); 
      table[i] = input.nextInt(); 
     } 
    }