View Compilation Error

0_0_33687739_15967.cpp:1:1: error: 'import' does not name a type
 import java.util.HashSet;
 ^
0_0_33687739_15967.cpp:2:1: error: 'import' does not name a type
 import java.util.Scanner;
 ^
0_0_33687739_15967.cpp:3:1: error: 'import' does not name a type
 import java.util.Set;
 ^
0_0_33687739_15967.cpp:5:1: error: expected unqualified-id before 'public'
 public class hd6 {
 ^