// Java Queue LinkedList Assignment
// A queue is implemented using a singly linked list.
// the variable: back "points" at the first node in the linked
list
// new elements ( enqueued) are added at the back
// the variable: front "points" at the last node in the linked
list.
// elements are removed (dequeued) from the front
//
// Several queue instance methods are provided for you; do not
change these
// Other instance methods are left for you as "ToDo" tasks
//
// You may not use any other Java classes or algorithms in
completing the ToDo items
// You may not add any instance variables to the class
// You may add your own private instance methods for modularity
sake
//
public class Practice {
private Node front, back;
static class Node {
public Node (char item, Node next)
{ this.item = item; this.next = next; }
public char item;
public Node next;
}
//This is the problem to solve.
// toString
// the function toString returns a single String
consisting of all the characters in the queue.
// the leftmost character in the returned string
should be the character at the FRONT of the queue
// Example; if the linked list representation is:
back--> 'a' 'b' 'c' 'd' <-- front
// the returned string would be "dcba"
// a normal traversal of the linked structure from
back to front would give us the string we want REVERSED
//
// You may not use any other Java classes ( e.g.
ArrayList, ) to solve this.
// You may use basic java arrays and methods of the
String class
//
// Hint1: you can build a String by starting with the
empty string and the concatenating characters as shown below
// String x ="";
// x = x + 'q'; // adds 'q' onto the right end of
String x
// Hint2: recursion is one way to handle the reversal
issue
public String toString() {
return ""; // TODO 1 fix this
}
code:
public String toString() {
// set str to "" we will add other values later
String str = "";
// create a temp node
Node temp = front;
// traverse till temp becomes null
while (temp != null) {
// add item to str
str = temp.item + str;
// move temp forward
temp = temp.next;
}
// retuirn str
return str;
}
screenshot:
// Java Queue LinkedList Assignment // A queue is implemented using a singly linked list. //...
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