class SuperClass {
    public SuperClass copy() {
        return new SuperClass();
    }
    public void printMe() {
        System.out.println("super");
    }
}

class SubClass extends SuperClass {
    public SubClass copy() {
        return new SubClass();
    }
    public void printMe() {
        System.out.println("sub");
    }
}
...
public static void main(String[] args) {
    SuperClass c = new SubClass();
    c.copy().printMe(); 
}
...

void writeLines(File file, String[] lines, String encoding) throws IOException {
    OutputStream os = new BufferedOutputStream(new FileOutputStream(file));
    try {
        for (String line: lines) {
            os.write(line.getBytes(encoding));
            os.write('\n');
        }
    } finally {
        os.close();
    }
}

CREATE TABLE employees (
    id int(11) NOT NULL default '0',
    name varchar(255) NOT NULL default '',
    since_date date NOT NULL,
    PRIMARY KEY (id)
)


Collection<Long> findElderEmployees(Long empoyeeId, javax.sql.DataSource dataSource);

<?xml version="1.0"?>
<companies>
    <company1 id="1">Mr. Brown & Sons</company1>
    <company2 id="abc">Mr. Green with Brothers</company2>
</companies>