第一次使用Java写pat

遇到了编译错误：

ERROR: can not renice
Main.java:3: error: class Three is public, should be declared in a file named Three.java
public class Three {
       ^
1 error

其解决方案为 Java的类名必须为Main

源代码：

import java.util.Scanner;

public class Three {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Scanner scanner=new Scanner(System.in);
  int a=scanner.nextInt();
  int i=0;
  while(a!=1)
  {
   if(a%2==0)
   {
    a/=2;
   }
   else
   {
    a=(3*a+1)/2;
   }
   i++;
  }
  System.out.println(i);
 }

}

更改后：

import java.util.Scanner;

public class Main {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Scanner scanner=new Scanner(System.in);
  int a=scanner.nextInt();
  int i=0;
  while(a!=1)
  {
   if(a%2==0)
   {
    a/=2;
   }
   else
   {
    a=(3*a+1)/2;
   }
   i++;
  }
  System.out.println(i);
 }

}