Java中應有的標識符

Question

我用Java編寫了一個簡單的程序：

public class Will {

    int static square(int x) {
        int y = x * x;
        return y;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Please enter a number...");
        int n = sc.nextInt();
        int result = Will.square(n);
        System.out.println("Square of " + n + " is " + result);
    }
}

當我嘗試編譯它時，出現了以下錯誤：

square.java:6: error: <identifier> expected
         int static square (int x)
            ^
square.java:6: error: invalid method declaration; return type required
         int static square (int x)
                    ^
2 errors

怎么解決呢？

Answer 1

它一定要是：

static int square (int x)

也就是說，返回類型必須在訪問修飾符之后和方法名稱之前。

Answer 2

像這樣改變

public/private/protected(Access specifier) static int square(int x) 

根據JAVA standard rules