How to use Qt5 to realize multithreading (I)

• Java 
#include "thread_one.h"

thread_one::thread_one(QObject *parent) : QThread(parent)
{
}
void thread_one::run()
{
    sleep(5);//模拟一个时长5s的复杂函数
    emit over();//复杂函数结束后发出信号
}
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