import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class Kode { private Lock lock = new ReentrantLock(); private String code; public boolean compareCode(String s) { return code.equals(s); } public void addCode(String c) { lock.lock(); try { code = c; } finally { lock.unlock(); } } public String getCode() { return code; } }