java question below:

9. You have been asked to write a non-void, one-parameter method to access nodes in a data set. What will be the argument passed to your method, and what will be the type of the returned value if the access mode is

a. The key field mode?

b. The node number mode?

10. Nodes are stored in a linear list.

a. What node comes just before node 6?

b. What node comes just after node 6?

11. Give the four basic operations performed on data structures, and tell what each operation does.

a.

b.

c.

d.