java - Java错误缺少返回语句

好了，我正在尝试编写这段代码，但是我一直收到这个愚蠢的错误。我不知道我在做什么错，所以也许你们中的一位专家可以帮助我。

import java.util.*;

public class School
{
Random randQuest = new Random();

int userAnswer;

public void createQuestion()
{

    int range = 10; // range of numbers in question

    int num1 = randQuest.nextInt( range );
    int num2 = randQuest.nextInt( range );

    userAnswer = num1 * num2;

    System.out.printf( "How much is %d times %d?\n",
        num1, num2 );

}

// prompt comment
public String promComm( boolean answer )
{
    if ( answer )
    {
        switch ( randQuest.nextInt( 1 ) )
        {

        case 0:
            return( "Very Good!" );

        }

        switch ( randQuest.nextInt( 1 ) )
        {

        case 0:
            return( "No. Please try again." );

        }
    }
}

}

最佳答案

在方法promComm中，如果answer是false，则该方法不返回任何值。
如果randQuest.nextInt(1) != 0.相同

应该是这样的：

public String promComm( boolean answer ){
    if (answer){

        switch (randQuest.nextInt(1)){
           case 0:
               return("Very Good!");
        }

        switch (randQuest.nextInt(1) ){
           case 0:
               return( "No. Please try again." );
        }

        return "Some value";

    }else

        return "Some value";
  }