View Compilation Error

0_0_5525538_28283\Main.java:2: class AB1 is public, should be declared in a file named AB1.java
public class AB1{
       ^
0_0_5525538_28283\Main.java:4: cannot find symbol
symbol  : class Scanner
location: class AB1
			Scanner sc=new Scanner(System.in);
			^
0_0_5525538_28283\Main.java:4: cannot find symbol
symbol  : class Scanner
location: class AB1
			Scanner sc=new Scanner(System.in);
			               ^
3 errors