78 lines
1.5 KiB
Java
78 lines
1.5 KiB
Java
class LinkedList{
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class Node{
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int item;
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Node next;
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public Node(int item) {
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this.item = item;
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}
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}
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Node head = null;
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public void addNode(int item){
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Node newElem = new Node(item);
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if(this.head != null){
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newElem.next = this.head;
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}
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this.head = newElem;
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}
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public void reverse(){
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Node prev = null;
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Node current = this.head;
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Node next = null;
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while (current != null) {
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next = current.next;
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current.next = prev;
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prev = current;
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current = next;
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}
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this.head =prev;
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}
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public void print() {
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Node current = head;
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if(head == null) return;
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System.out.print("[ ");
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while(current != null) {
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System.out.print(current.item + " ");
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current = current.next;
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}
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System.out.println("]");
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}
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}
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public class reverse{
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public static void main(String [] args){
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LinkedList list = new LinkedList();
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list.addNode(2);
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list.addNode(7);
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list.addNode(1);
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list.addNode(8);
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list.addNode(5);
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System.out.print("before : \t");
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list.print();
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list.reverse();
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System.out.print("after reverse : ");
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list.print();
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}
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}
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/*
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to run the file :
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javac reverse.java
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java reverse
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results :
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before : [ 5 8 1 7 2 ]
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after reverse : [ 2 7 1 8 5 ]
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*/ |