View Compilation Error

0_0_18000525_21555.cpp:1:1: error: 'package' does not name a type
 package com.yangyang.java8;
 ^
0_0_18000525_21555.cpp:3:1: error: 'import' does not name a type
 import java.util.ArrayList;
 ^
0_0_18000525_21555.cpp:4:1: error: 'import' does not name a type
 import java.util.List;
 ^
0_0_18000525_21555.cpp:5:1: error: 'import' does not name a type
 import java.util.Scanner;
 ^
0_0_18000525_21555.cpp:7:1: error: expected unqualified-id before 'public'
 public class DemoTest {
 ^