View Compilation Error

0_0_25956462_20065.cpp:12:2: error: stray '@' in program
  @SuppressWarnings("null")
  ^
0_0_25956462_20065.cpp:1:1: error: 'package' does not name a type
 package test;
 ^
0_0_25956462_20065.cpp:3:1: error: 'import' does not name a type
 import java.math.BigInteger;
 ^
0_0_25956462_20065.cpp:4:1: error: 'import' does not name a type
 import java.math.RoundingMode;
 ^
0_0_25956462_20065.cpp:5:1: error: 'import' does not name a type
 import java.math.BigDecimal;
 ^
0_0_25956462_20065.cpp:6:1: error: 'import' does not name a type
 import java.util.Scanner;
 ^
0_0_25956462_20065.cpp:7:1: error: 'import' does not name a type
 import java.util.Set;
 ^
0_0_25956462_20065.cpp:8:1: error: 'import' does not name a type
 import java.util.TreeSet;
 ^
0_0_25956462_20065.cpp:10:1: error: expected unqualified-id before 'public'
 public class Main {
 ^