1. Suppose x and y are non-null references to two nodes. The data in each node is a non-null Object. Write two boolean expressions: (1) an expression that is true if x and y refer to exactly the same...

1. Suppose x and y are non-null references to two nodes. The data in each node is a non-null Object. Write two boolean expressions: (1) an expression that is true if x and y refer to exactly the same node, and (2) an expression that is true if the data from the x node is equal to the data from the y node. Use the equals method where appropriate.