View Compilation Error

0_0_16960009_655.cpp:1:1: error: 'package' does not name a type
 package demo;
 ^
0_0_16960009_655.cpp:3:1: error: 'import' does not name a type
 import java.util.Scanner;
 ^
0_0_16960009_655.cpp:5:1: error: 'import' does not name a type
 import edu.princeton.cs.algs4.StdOut;
 ^
0_0_16960009_655.cpp:7:1: error: expected unqualified-id before 'public'
 public class demo {
 ^