Java：調用方法main中的方法

Question

僅供參考：我是初學者。此外，我明白，調用方法是一個新手概念，並且已經有幾個這樣的線程。我的情況有點不同，因爲我受到僞代碼的限制，我的程序必須鏡像相同。我無法從其他方法調用方法，包括從main中調用方法。下面是僞代碼後面是我寫的代碼：

僞代碼：

// The user enters an integer and the program calculates that many primes 
// It uses 3 methods, including the main. All the methods are in the same class 
// and should be declared as ‘public static.’ 

Project Print the First n Primes 
    Package printTheFirstNPrimesPackage 
     Class PrintTheFirstNPrimes 
      Method Main 
       Declare numberOfPrimes as integer 
Print 「How many prime numbers do you want?" 
       Read numberOfPrimes from the keyboard 
       Call the method: PrintNPrimes(numberOfPrimes) 
      end Method (Main) 

//   *********************************************************** 
//   This method accepts an integer and prints that many prime 
//   numbers, starting at 2. 2 is the lowest primt number. 
//   *********************************************************** 
      Method void PrintNPrimes(int n) 
       declare i as integer 
       declare myNum as integer 
       myNum = 2 // The first prime number 
       i = 0 
       loop while i < n // This could be a ‘for’ loop 
       if IsPrime(myNum) // Call the Isprime method, (see below) 
        i = i + 1 
        print myNum 
       End If 
       myNum = myNum + 1 
       end loop 
      end Method PrintNPrimes 
//   ********************************************************** 
//   This method accepts an integer and tests to see if it is 
//   a prime number. If it is prime, the method returns true, 
//    otherwise it returns false. 
//   ********************************************************** 
      Method boolean IsPrime(int number) 
       Declare result as boolean 
       result = true 
       declare i as integer 
       i = 2 
       loop while i < number 
        if ((number % i) == 0) 
         result = false 
         exit loop 
        end if 

       end loop 
       return result 
      end Method 

     end Class 
    End Package 
End Project 

Java代碼：

package printTheFirstNPrimesPackage; 
import java.util.*; 

public class PrintTheFirstNPrimes { 
    public static void main(String [] args) { 
     int numberOfPrimes; 
     Scanner primes = new Scanner(System.in); 
     System.out.println("How many prime numbers do you want?"); 
     numberOfPrimes = primes.nextInt(); 
     // Call the method PrintNPrimes(numberOfPrimes) 
    } 
    public static void PrintNPrimes(int n) { 
     int i; 
     int myNum; 
     myNum = 2; // The first prime number 
     i = 0; { 
     while (i < n) 
//  if IsPrime(myNum) // Call the IsPrime method (see below) { 
       i = i + 1; 
       System.out.println(myNum); 
     myNum = myNum + 1; 
     } 
    } 
    public static boolean IsPrime(int number) { 
     boolean result; 
     result = true; 
     int i = 2; 
     while (i < number) { 
      if ((number % 1) == 0) 
       result = false; 
      } 
     return result; 
     } 
    } 

我的主要問題是調用如果內使用isPrime方法聲明。我得到一個錯誤，說IsPrime不能從int轉換爲布爾值，但我知道這個僞代碼限制了我做其他事情。我還希望就如何在main方法中調用PrintNPrimes方法提供建議。謝謝。

Answer 1

因爲您的PrintNPrimes是靜態方法，您可以通過傳遞numberofPrimes來調用該方法。

例子：

public static void main(String [] args) { 
     int numberOfPrimes; 
     Scanner primes = new Scanner(System.in); 
     System.out.println("How many prime numbers do you want?"); 
     numberOfPrimes = primes.nextInt(); 
     PrintNPrimes(numberOfPrimes); 
    } 
    .......... 

注：Java命名約定，建議使用首字母爲小寫字母，同時定義方法。

您可以按照相同的方法來調用其他方法。

Answer 2

如果IsPrime（myNum的）

需求是

如果（IsPrime（myNum的））

此外，一定要恢復你的花括號。我看不出有什麼理由會導致錯誤。如果您仍有問題，請發佈確切的錯誤消息。

Answer 3

更新，分辨率下面的代碼爲兩者（包括if語句）的編譯錯誤：

printNPrimes(numberOfPrimes);

if (isPrime(myNum)) // Call the IsPrime method (see below) {

完全更新的代碼：

public static void main(String [] args) { 
    int numberOfPrimes; 
    Scanner primes = new Scanner(System.in); 
    System.out.println("How many prime numbers do you want?"); 
    numberOfPrimes = primes.nextInt(); 
    printNPrimes(numberOfPrimes); 
} 
public static void printNPrimes(int n) { 
    int i; 
    int myNum; 
    myNum = 2; // The first prime number 
    i = 0; { 
    while (i < n) 
    if (isPrime(myNum)) // Call the IsPrime method (see below) { 
      i = i + 1; 
      System.out.println(myNum); 
    myNum = myNum + 1; 
    } 
} 
public static boolean isPrime(int number) { 
    boolean result; 
    result = true; 
    int i = 2; 
    while (i < number) { 
     if ((number % 1) == 0) 
      result = false; 
     } 
    return result; 
} 

我沒不檢查邏輯。