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我正在为期末考试学习，但我对如何解决这个问题感到困惑。
Write a generic class named Saver. It should have one method named save. This method should store the value that is passed and return the previous value For example, this class should support the following behavior:
Saver<Integer> saver1 = new Saver(13);
System.out.println(saver2.save(42)); // prints 13
System.out.println(saver2.save(-999)); // prints 42
System.out.println(saver2.save(2013)); // prints -999
Saver<String> saver2 = new Saver("foo");
System.out.println(saver2.save("bar")); // prints foo
System.out.println(saver2.save("why")); // prints bar
System.out.println(saver2.save("yar")); // prints why
我不需要代码，我只想知道如何完成这个任务？