View Compilation Error

0_0_6094027_16024\Main.java:3: cannot find symbol
symbol  : class List
location: class Main
        List<String> list = new ArrayList<String>();
        ^
0_0_6094027_16024\Main.java:3: cannot find symbol
symbol  : class ArrayList
location: class Main
        List<String> list = new ArrayList<String>();
                                ^
0_0_6094027_16024\Main.java:4: cannot find symbol
symbol  : class Scanner
location: class Main
        Scanner cin = new Scanner(System.in);
        ^
0_0_6094027_16024\Main.java:4: cannot find symbol
symbol  : class Scanner
location: class Main
        Scanner cin = new Scanner(System.in);
                          ^
4 errors