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doubly-linked list. The DList1 class does not use a sentinel, whereas theDList2 class does. The DList1 class is not circularly linked, but the DList2class is (through the sentinel). Compile DList1.java and DList2.java (using”javac -g DList1.java DList2.java”.)Your task is to implement two insertFront() and two removeFront() methods–oneof each for each list class. insertFront() and removeFront() insert or removean item at the beginning of a list. Make sure your implementations work forempty lists, one-node lists, and larger lists.The main() methods of DList1 and DList2 include test code, which you can runwith “java DList1” and “java DList2″.Part I: insertFront in DList1 (1 point)—————————————-Write a method called DList1.insertFront() that inserts an int at the front of”this” DList1.Part II: removeFront in DList1 (1 point)—————————————–Write a method called DList1.removeFront() that removes the first item (andnode) from “this” DList1.Part III: insertFront in DList2 (1 point)——————————————Write a method called DList2.insertFront() that inserts an int at the front of”this” DList2. Your code should NOT use any “if” statements or conditionals.Part IV: removeFront in DList2 (2 points)——————————————Write a method called DList2.removeFront() that removes the first item (andnon-sentinel node) from “this” DList2. Your code should not require separatebranches for the one-node case and the more-than-one-node case. (You willneed one “if”, to handle the zero-node case.)Check-off———Run the DList1 and DList2 test code.1 point: DList1.insertFront().1 point: DList1.removeFront().1 point: DList2.insertFront().1 point: DList2.removeFront().Purchase the answer to view itPurchase the answer to view itPurchase the answer to view it
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