Question

我是Java的新手，并且一直试图弄清楚为什么javac在尝试运行时一直给我一个错误。我真的很难过，不理解我的错误。这是出现在错误消息中的代码，它是游戏修改的一部分。

public static LOTRFaction forName(String name)
  {
    for (LOTRFaction f : ) {
      if (f.codeName().equals(name)) {
        return f;
      }
    }
    return null;
  }

  public static LOTRFaction forID(int ID)
  {
    for (LOTRFaction f : ) {
      if (f.ordinal() == ID) {
        return f;
      }
    }
    return null;
  }

Answer 1

您收到语法错误的原因是您错过了Enhanced for loop的一部分。增强的for循环需要以下语法：

for (Object my_object : my_object_iterable) {
    // Do stuff here
}

my_object分配给my_object_iterable中每个值的in。它与使用my_object_iterable关键字的循环很像python。 import java.util.Random; import java.io.*; import java.util.*; /** Courtney Fox Professor Yao Midterm Part 1 10/10/17 Purpose: The purpose of this program is to develop a Nim game that consists of a pile of stones ranging from 10-16. From that pile, both the player and computer have to pick up to 3 stones and whoever gets the last stone loses. Logic: **/ public class FoxMidQ1 { public static void main(String[] args) { //Variables int user = 0; //int computer; //int loser; int gamenum = 0; //Scanner Scanner input = new Scanner(System.in); //Welcome Output System.out.println("Welcome to Nim Game!"); //Get pile size: Randomly generate 10-16 int[] pile = {10, 11, 12, 13, 14, 15 , 16}; int stones = pile[(int)(Math.random() * pile.length)]; System.out.println("Game #"+ (gamenum + 1) +": There are "+ stones + " stones in the pile."); System.out.println("You can remove up to 3 stones from pile at a time."); //User takes stones System.out.println("How many stones would you like to remove? "); user = input.nextInt();必须是可迭代对象（Array，List，ArrayList等）并包含相同类型的my_object。你有一个没有可迭代的for循环！ java编译器不知道你想要循环什么，因为你没有提供任何东西。

Javac非法表达错误？

1 个答案: