以下是一个使用条件同步方法实现并发的示例代码：

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ConcurrentConditionSync {
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();
    private boolean flag = false;

    public void printOddNumbers() throws InterruptedException {
        lock.lock();
        try {
            while (flag) {
                condition.await();  // 释放锁并等待条件满足
            }
            for (int i = 1; i <= 10; i+=2) {
                System.out.println(i);
            }
            flag = true;
            condition.signal();  // 唤醒其他线程
        } finally {
            lock.unlock();
        }
    }

    public void printEvenNumbers() throws InterruptedException {
        lock.lock();
        try {
            while (!flag) {
                condition.await();  // 释放锁并等待条件满足
            }
            for (int i = 2; i <= 10; i+=2) {
                System.out.println(i);
            }
            flag = false;
            condition.signal();  // 唤醒其他线程
        } finally {
            lock.unlock();
        }
    }

    public static void main(String[] args) {
        ConcurrentConditionSync concurrentSync = new ConcurrentConditionSync();

        Thread t1 = new Thread(() -> {
            try {
                concurrentSync.printOddNumbers();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        Thread t2 = new Thread(() -> {
            try {
                concurrentSync.printEvenNumbers();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        t1.start();
        t2.start();
    }
}

上述代码中，ConcurrentConditionSync类实现了一个打印奇数和偶数的方法。通过使用Lock和Condition接口，我们可以实现条件同步的功能。flag变量用于判断当前应该打印奇数还是偶数。当flag为false时，奇数线程等待，偶数线程执行打印偶数的操作；当flag为true时，偶数线程等待，奇数线程执行打印奇数的操作。在每个方法内部，使用lock.lock()获取锁，condition.await()释放锁并等待条件满足，condition.signal()唤醒其他线程。在main方法中，创建两个线程分别执行打印奇数和偶数的操作。