试图将if-else语句转换为switch语句，但最终出现错误

debugcn 发表于 Dev

和

我一直在尝试将以下if语句转换为switch语句。

/**
 * Return appropriate comment for given score and par for hole.
 * You can assume that score is not less than 4 below par for hole.
 * For example, if score is 4 below par, return "condor!!!!",
 * if score is 3 below par, return "albatross!!!",
 * if score is 2 below par, return "eagle!!", etc.
 * See Assign 2 description for full list of comments.
 * @param score
 * @param parForHole
 * @return appropriate comment for given score and par for hole.
 */
public static String comment(int score, int parForHole) {   
    if ( score == parForHole-4)
        return "condor!!!!";
    if ( score == parForHole-3)
        return "albatross!!!";
    if ( score == parForHole-2)
        return "eagle!!";
    if ( score == parForHole-1)
        return "birdie!";
    if ( score == parForHole)
        return "par";
    if ( score == parForHole+1)
        return "bogey";
    if ( score == parForHole+2)
        return "double bogey";
    if ( score == parForHole+3)
        return "triple bogey";

return "Not valid"; // Replace by a suitable switch stmt.
}

这是我的尝试：

public static String comment(int score, int parForHole) {   

     String monthString;
        switch (score) {
            case parForHole-4:  monthString = "condor!!!!";
                     break;
            case parForHole-3:  monthString = "albatross!!!";
                     break;
            case parForHole-2:  monthString = "eagle!!";
                     break;
            case parForHole-1:  monthString = "birdie!";
                     break;
            case parForHole:  monthString = "par";
                     break;
            case parForHole+1:  monthString = "bogey";
                     break;
            case parForHole+2:  monthString = "double bogey";
                     break;
            case parForHole+3:  monthString = "triple bogey";
                     break;
            default: monthString = "Invalid";
                     break;
        }
        return monthString;

}

当我尝试运行此命令时，eclipse会为“ case表达式必须是常量表达式”的每种case条件提供错误信息。我不确定如何克服这个问题。谁能帮我吗？谢谢。

蜘蛛鲍里斯（Boris）

在一个项目case中的一个switch语句必须是编译时常：

public static String comment(int score, int parForHole) {       
        switch (score - parForHole) {
            case -4:  
                     return "condor!!!!";
            case -3:  
                     return "albatross!!!";
            case -2:  
                     return "eagle!!";
            case -1:  
                     return "birdie!";
            case 0:  
                     return "par";
            case 1:  
                     return "bogey";
            case 2:  
                     return "double bogey";
            case 3:  
                     return "triple bogey";
            default: 
                     return "Invalid";
        }
}

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