基本 Java：错误：需要类、接口或枚举
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Basic Java: Error: Class, Interface, or Enum Expected
提问by user2943817
I am trying to write a method to see if the string is a palindrome (Words that can be spelled correctly backwards too, for example "racecar". I cant find the error so maybe another set of eyes will help. Here is the code:
我正在尝试编写一种方法来查看字符串是否为回文（也可以向后正确拼写的单词，例如“racecar”。我找不到错误，所以也许另一组眼睛会有所帮助。这是代码：
public boolean isPalindrome(String str){
numberofQuestions++;
int n = str.length();
for( int i = 0; i < n/2; i++ )
if (str.charAt(i) != str.charAt(n-i-1)) return false;
return true;
}
EDIT: Screenshot of errors:
编辑：错误截图：
Start of class:
上课开始：
public class Geek{
private String name;
private int numberofQuestions=0;
Final Edit: Found an extra "{" inside one of the methods. Thanks to everyone for your help!
最终编辑：在其中一个方法中发现了一个额外的“{”。感谢大家的帮助！
回答by Reimeus
The method should be fully enclosed within a class
该方法应该完全包含在一个类中
public class Geek {
private String name;
private int numberofQuestions = 0;
public boolean isPalindrome(String str) {
numberofQuestions++;
int n = str.length();
for (int i = 0; i < n / 2; i++)
if (str.charAt(i) != str.charAt(n - i - 1))
return false;
return true;
}
}
回答by Eng.Fouad
I bet it is something related to missing braces, or braces that closes the class body before starting this method definition.
我敢打赌，这与缺少大括号或在开始此方法定义之前关闭类主体的大括号有关。
回答by Eng.Fouad
Make the isPalindrome()function static.
使isPalindrome()函数静态。
Here's a sample:
这是一个示例：
public class Sample {
private static int numberofQuestions;
public static void main(String[] args)
{
String str = "racecar";
String str2 = "notpalindrome";
boolean test = isPalindrome(str);
boolean test2 = isPalindrome(str2);
System.out.println(str + ": " + test);
System.out.println(str2 + ": " + test2);
}
public static boolean isPalindrome(String str) {
numberofQuestions++;
int n = str.length();
for (int i = 0; i < n / 2; i++)
if (str.charAt(i) != str.charAt(n - i - 1))
return false;
return true;
}
}
Output:
输出：
racecar: true
notpalindrome: false
回答by user2885596
You must check your curly braces that whether it is properly ended after looping , method and class.
你必须检查你的花括号是否在循环、方法和类之后正确结束。
回答by Manish Doshi
I think there is problem in curly braces. You didnt end the bracket of main class Geek{ }.
我认为花括号有问题。你没有结束主类 Geek{} 的括号。
Check this:
检查这个：
public class Geek
{
private String name;
private int numberofQuestions = 0;
public boolean isPalindrome(String str)
{
numberofQuestions++;
int n = str.length();
for (int i = 0; i < n / 2; i++)
if (str.charAt(i) != str.charAt(n - i - 1))
return false;
return true;
}
}
