编译错误:缺少return语句

Question

这个程序用3种不同的方法来制作掷骰子.我需要帮助玩掷骰子,但我需要有这3种不同的方法,但由于某些原因,每次我编译我收到此错误:

CrapsAnalysis.java:48: error: missing return statement
    }
    ^
1 error
Process javac exited with code 1

码:

public class CrapsAnalysis
{   
public static int rollDie( int n) {
    return (int)(Math.random()*n) + 1 ;
}
public static int rollDice( ) {
    return rollDie(6) + rollDie(6) ;
}
public static boolean playOneGame( ) {
    int newDice = rollDice();
    int roll = rollDice(); //first roll of the dice
    int playerPoint = 0; //player point if no win or loss on first roll
    if (roll == 7 || roll == 11)
        return true;
    else if (roll == 2 || roll == 3 || roll == 12)
        return false;
    else    
        playerPoint = roll;
    do {
        if (rollDice() == 7)
            return false;
        else if (rollDice() == playerPoint) 
            return true;
        else
            newDice = rollDice();
        } while (rollDice() != playerPoint || rollDice() != 7) ;
    }
}

Answer 1

Java必须查看所有执行路径.如果while循环结束而没有返回任何内容会发生什么 您可能在逻辑上阻止了这一点,但Java编译器不会进行该分析.

return在while循环结束后提供一个语句,或者抛出某种Exception(IllegalStateException？)如果代码真的不应该在那里.