Program recycling method and device and recovering method and device

The invention discloses a program recycling method and device and recovering method and device. The recycling method includes detecting class members of a program to be recycled, and allowing the program to be one operates in the background; judging whether the class members of the program to be recycled contain annotation information or not, and determining the class members containing the annotation information to be recycled; if the detected class members of the program to be recycled contain annotation information are determined, storing the class members during the recycling of the program to be recycled. By the aid of the methods, the problem of low efficiency when the program operating in the background is recycled or recovered is solved.