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public class DatabaseHelper extends SQLiteOpenHelper implements Closeable {
 
    protected static Context mContext;
 
    public static DatabaseHelper getInstance() {
        return LazyHolder.INSTANCE;
    }
 
 
    private static class LazyHolder {
        private static final DatabaseHelper INSTANCE = new DatabaseHelper(mContext);
    }
}

Main.java:1: error: class DatabaseHelper is public, should be declared in a file named DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper implements Closeable {
       ^
Main.java:1: error: cannot find symbol
public class DatabaseHelper extends SQLiteOpenHelper implements Closeable {
                                    ^
  symbol: class SQLiteOpenHelper
Main.java:1: error: cannot find symbol
public class DatabaseHelper extends SQLiteOpenHelper implements Closeable {
                                                                ^
  symbol: class Closeable
Main.java:3: error: cannot find symbol
    protected static Context mContext;
                     ^
  symbol:   class Context
  location: class DatabaseHelper
4 errors

Standard output is empty