java - 没有 if 语句的决定

Question

以下是说明:

/*
 * Write a method called isGameOver. The method should have three parameters, 
 * all integers and in this order: the player's score, the number of lives 
 * the player has remaining, the game level. The method should return true 
 * if the game is over and false otherwise, according to the following game
 * rule. The game continues only when the player has at least one life 
 * remaining and one of these conditions is met: 
 *   --The player is on level 1 and his/her score at least 1000. 
 *   --The player is on level 2 and his/her score at least 2000. 
 *   --The player is on any level and his/her score at least 3000. 
 *   
 * For example, the method call isGameOver(1500, 1, 2) should return true. 
 * 
 * DO NOT USE AN IF STATEMENT

这是我的代码:

public static String isGameOver(int score, int lives, int level) {

    while (level == 1 && level < 1001)
        return "false";

    while (level == 2 && level < 2001)
        return "false";

     while (level == 3 && level < 3001)
        return "false";

    return "true";          
}

显然不行，我就是有这种感觉是因为我用了while循环。如何在不使用 if 语句的情况下做出决定？

Answer 1

如果您想要一个可读的解决方案，那么您几乎可以直接将问题描述转化为代码。

/**
* The game continues only when the player...
**/
private static boolean gameContinues(int score, int lives, int level) {
    // has at least one life
    boolean stillAlive = lives >= 1; 
    // is on level 1 and his/her score at least 1000
    boolean cond1 = (level == 1 && score >= 1000); 
    // is on level 2 and his/her score at least 2000
    boolean cond2 = (level == 2 && score >= 2000);
    // is on any level and his/her score at least 3000
    boolean cond3 = score >= 3000;

    // return true if has at least one life remaining and one of the conditions is met
    return stillAlive && (cond1 || cond2 || cond3);
}

// The function you want just returns the inverse of what is defined
public static boolean isGameOver(int score, int lives, int level) {
    return !gameContinues(score, lives, level);
}