Java的編譯錯誤：無法找到符號

Question

我寫了一個Java程序，但我得到一個錯誤：

ArrayMain.java:13: error: cannot find symbol 
      ar[c]=input.nextInt; 
        ^
    symbol: variable nextInt 
    location: variable input of type Scanner 

代碼：

import java.util.Scanner; 
class ArrayMain 
{ 
    public static void main(String[] args) 
    { 
     Scanner input=new Scanner(System.in); 
     System.out.println("Enter the size:"); 
     int c=input.nextInt(); 
     int[] ar=new int[c]; 
     System.out.println("Enter Element"); 
     for(int i=0;i<c;i++) 
     { 
      ar[c]=input.nextInt; 
     } 

     array(ar,c); 
    } 
    public static void array(int[] ar,int c); 
    { 
     System.out.println("Elements in reverse order are"); 
     for(int i=c;i>0;i--); 
     { 
      System.out.println(ar[c-1]); 
     } 
    } 
} 

我怎樣才能解決呢？

Answer 1

應該

ar[c]=input.nextInt(); 

，並確保該方法的定義是正確的

public static void array(int[] ar,int c) { //notice the removal of semicolon 

Answer 2

ar[c] = input.nextInt; 

這是錯誤的，正確的代碼是：

ar[c] = input.nextInt(); 

Answer 3

你應該把指數i，而不是在ar[c]c遍歷每個輸入元素

System.out.println("Enter Element"); 
    for(int i=0;i<c;i++) 
    { 
     ar[i]=input.nextInt(); //not input.nextInt 
    } 

也是方法array(int[] ar,int c)有問題應該是：

public static void array(int[] ar,int c) // method decleration shouldn't end with `;` 
{ 
    System.out.println("Elements in reverse order are"); 
    // for loop mustn't end with ';' for(int i=c;i>0;i--); 
    for(int i=c-1;i>=0;i--) // start at last element index to the first element which index is i=0 
    { 
     System.out.println(ar[i]); // loop over each element in reverse order 
    } 
}