Question

public class BottlesOfBeer {
  public static void countdown(int bottles) {
    if (bottles > 0) {
      System.out.printf("%d bottles of beer on the wall,\n", bottles);
      System.out.printf("%d bottles of beer,\n", bottles);
      System.out.printf("ya' take one down, ya' pass it around,\n", bottles);
      bottles -= 1;
      System.out.printf("%s bottles of beer on the wall.\n", bottles);
    } else if (bottles == 0) {
      System.out.println("No bottles of beer on the wall,");
      System.out.println("no bottles of beer,");
      System.out.println("ya' can't take one down, ya' can't pass it around,");
      System.out.println("'cause there are no more bottles of beer on the wall!");
    } else {
      System.out.println("Wait, you can't have negative bottles...");
    }

  public static void main(String args[]) {
    int bottles = 99;
        countdown(bottles);
      }
    }

Error: illegal start of expression [Line: 18]

我是Java的新手，我不明白为什么在编译它时会出现此错误。据说这个程序从99到1倒计时，然后当瓶子= 0时再次打印。

Answer 1

您没有关闭countdown方法，这使main方法成为其中的一部分。在主方法上方添加结束}。

感谢您提醒我手动计算括号的日子....

Answer 2

你错过了一个结束大括号'}'来关闭你的“倒计时”方法。在第18行添加一个。

Answer 3

else阻止

后你缺少一个大括号

else {
      System.out.println("Wait, you can't have negative bottles...");
    }
} // add this to fix the compile error

或者您可以省略{}一行语句

else
      System.out.println("Wait, you can't have negative bottles...");
} // close braces of countdown method

Answer 4

你忘了关闭你的cowntdown功能，如果你想让你的瓶子变量倒计时，你需要循环它。

public class BottlesOfBeer {
  public static void countdown(int bottles) {
    for(int i = bottles; i>=0 ; i--){
      if (bottles > 0) {
        System.out.printf("%d bottles of beer on the wall,\n", bottles);
        System.out.printf("%d bottles of beer,\n", bottles);
        System.out.printf("ya' take one down, ya' pass it around,\n", bottles);
        bottles -= 1;
        System.out.printf("%s bottles of beer on the wall.\n", bottles);
      } else if (bottles == 0) {
        System.out.println("No bottles of beer on the wall,");
        System.out.println("no bottles of beer,");
        System.out.println("ya' can't take one down, ya' can't pass it around,");
        System.out.println("'cause there are no more bottles of beer on the wall!");
      } else {
        System.out.println("Wait, you can't have negative bottles...");
      }
    }
  }

  public static void main(String args[]) {
    int bottles = 99;
    countdown(bottles);
  }
}

Answer 5

你错过了以下其他声明的大括号：

else { 
      System.out.println("Wait, you can't have negative bottles...");
    } 
}// Fix

如果您对编码非常陌生，可以使用Notepad ++。有了这个，你就可以轻松避免这种错误。快乐学习！

Java（main）中非法启动表达式错误？

5 个答案: