試撰寫一程式，由實作Runnable介面的方式建立t1與t2兩個執行緒。t1執行緒每隔1

秒便印出 "Thread 1 is running" 的字串，t2 執行緒每隔2.5 秒便印出 "Thread 2 is

running" 字串，直到每個執行緒執行run() method 10次為止。-Try to write a program, create a way to implement Runnable interface by two threads t1 and t2. t1 thread will be printed every 1 second " Thread 1 is running"　string, t2 thread every 2.5 seconds to print the " Thread 2 is running"　strings until each thread executes run () method 10 times so far.