Question: (JAVA) The ADT stack lets you peek at its top entry without removing it. For some applications of stacks, you also need to peek at

(JAVA) The ADT stack lets you peek at its top entry without removing it. For some applications of stacks, you also need to peek at the entry beneath the top entry without removing it. We will call such an operation peek2. If the stack has more than one entry, peek2 returns the second entry from the top without altering the stack. If the stack has fewer than two entries, peek2 returns null. Write a linked implementation of a stack that includes a method peek2

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