在java中使用线程执行多个休眠查询

Question

我有以下几行要执行，我想知道是否有办法使用线程一次执行它们。

repository_1.deleteAll();
repository_2.deleteAll();
repository_3.deleteAll();
repository_4.deleteAll();
repository_5.deleteAll();
repository_6.deleteAll();

Answer 1

new Thread(repository_1::deleteAll).start();
new Thread(repository_2::deleteAll).start();
new Thread(repository_3::deleteAll).start();
new Thread(repository_4::deleteAll).start();
new Thread(repository_5::deleteAll).start();
new Thread(repository_6::deleteAll).start();

或者如果您使用的是较旧的 java 版本：

new Thread(new Runnable() { @Override public void run() { repository_1.deleteAll(); }}).start();
new Thread(new Runnable() { @Override public void run() { repository_2.deleteAll(); }}).start();
new Thread(new Runnable() { @Override public void run() { repository_3.deleteAll(); }}).start();
new Thread(new Runnable() { @Override public void run() { repository_4.deleteAll(); }}).start();
new Thread(new Runnable() { @Override public void run() { repository_5.deleteAll(); }}).start();
new Thread(new Runnable() { @Override public void run() { repository_6.deleteAll(); }}).start();

或者如果您想在继续执行代码之前等待所有这些都完成删除：

Thread t1 = new Thread(repository_1::deleteAll);
Thread t2 = new Thread(repository_2::deleteAll);
Thread t3 = new Thread(repository_3::deleteAll);
Thread t4 = new Thread(repository_4::deleteAll);
Thread t5 = new Thread(repository_5::deleteAll);
Thread t6 = new Thread(repository_6::deleteAll);
    
t1.start();
t2.start();
t3.start();
t4.start();
t5.start();
t6.start();
    
try {
    t1.join();
    t2.join();
    t3.join();
    t4.join();
    t5.join();
    t6.join();
} catch (Throwable tr) {
    tr.printStackTrace();
}

您也可以使用一种方法来完成所有这些操作，而无需一遍又一遍地重复相同的代码。