View Compilation Error

0_0_18445022_29480.cpp:5:2: error: stray '@' in program
  @SuppressWarnings("null")
  ^
0_0_18445022_29480.cpp:1:1: error: 'import' does not name a type
 import java.math.BigInteger;
 ^
0_0_18445022_29480.cpp:2:1: error: 'import' does not name a type
 import java.util.*;
 ^
0_0_18445022_29480.cpp:3:1: error: expected unqualified-id before 'public'
 public class bigint {
 ^