1.Which of the following are critical to fix the class below which is claimed to use the Singleton pattern?

Check all that apply

The constructor Singleton( ) should be static

The constructor Singleton( ) should be private

The getInstance( ) should be static

The getInstance( ) should be public

2.The interfaces Serializable and Cloneable in Java are empty (no operations declared), while the interface Runnable declares one operation run( ). Which one is correct?

	They are all Marker interfaces.
	Two of them are not Marker interfaces.

One of them is not a Marker interface.

None of them is a Marker interface.

3.Many clients compete for a limited number of objects created from a ServiceProvider class to do their jobs. A proposal is to have one Manager object take full charge of all service requests from clients. Which design pattern is less likely to be used?

	Object Pool
	Marker
	Singleton

Delegation

Singleton +Singleton -getinstance() -operation 10