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September 4, 2020 19:58
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Queue in java generic
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import java.util.Scanner; // Import the Scanner class | |
public class Main { | |
public static void main(String[] args){ | |
int n; | |
int buff; | |
Scanner scanner = new Scanner(System.in); // Create a Scanner object | |
Queue<Integer> myQueue = new Queue<Integer>(); | |
System.out.println("Ingrese la cantidad de datos que va a adicionar a la cola"); | |
n = scanner.nextInt(); | |
for(int i=0; i < n; i++){ | |
buff = scanner.nextInt(); | |
myQueue.enqueue(buff); | |
} | |
while(!myQueue.empty()){ | |
buff = myQueue.top(); | |
myQueue.dequeue(); | |
System.out.println(buff); | |
} | |
// int n; | |
// String buff; | |
// Scanner scanner = new Scanner(System.in); // Create a Scanner object | |
// | |
// Queue<String> myQueue = new Queue<String>(); | |
// System.out.println("Ingrese la cantidad de datos que va a adicionar a la cola"); | |
// n = scanner.nextInt(); | |
// | |
// for(int i=0; i < n; i++){ | |
// buff = scanner.next(); | |
// myQueue.enqueue(buff); | |
// } | |
// | |
// while(!myQueue.empty()){ | |
// buff = myQueue.top(); | |
// myQueue.dequeue(); | |
// System.out.println(buff); | |
// } | |
} | |
} |
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class Node<T extends Comparable<T>> { | |
private T value; | |
private Node next; | |
public Node(T value, Node next) { | |
this.value = value; | |
this.next = next; | |
} | |
public Node(T value) { | |
this.value = value; | |
this.next = null; | |
} | |
public Node() { | |
this.value = null; | |
this.next = null; | |
} | |
public T getValue() { return this.value; } | |
public Node getNext() { return this.next; } | |
public void setValue(T value) { this.value = value; } | |
public void setNext(Node next) { this.next = next; } | |
} |
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class Queue<T extends Comparable<T>> { | |
private Node<T> head; | |
private Node<T> tail; | |
public Queue() { | |
this.head = this.tail = null; | |
} | |
public void enqueue(T value){ | |
Node n_node = new Node(value); | |
// no elements | |
if(this.head == null && this.tail == null) { | |
this.head = this.tail = n_node; | |
} | |
else { | |
// n elements | |
this.tail.setNext(n_node); | |
this.tail = n_node; | |
} | |
} | |
public void dequeue() { | |
// no elements | |
if(this.head == null && this.tail == null) return; | |
// 1 element | |
if(this.head == this.tail) { | |
this.head = this.tail = null; | |
return; | |
} | |
// n elements | |
this.head = this.head.getNext(); | |
} | |
public boolean empty(){ | |
if (this.head == null) return true; | |
else return false; | |
} | |
public T top(){ | |
return this.head.getValue(); | |
} | |
} |
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