java - I need help to write a program that takes input from user and reverses using a stack? -


i’m trying build program (java) take string input user puts stack , reverses stack using push , pop. when user inputs “end-line” program stop pushing stack , print strings entered user in reverse order ?

public class stackreversal{  private class node{      private string item;     private node next; } private node first = null;  public boolean isempty(){   return(first == null); } public void push(string s){     node node = new node();     node.item = s;     node.next = first;      first = node; } public string pop(){     if(first == null)        throw new runtimeexception("stack empty!");     string result = first.item;     first = first.next;     return result;  }  public string popstring(){     string result="";     node current = first;      while(current != null){         result += current.item;         current = current.next;     }     return result; } public static void main(string [] args) {     stackreversal s = new stackreversal();     s.push("hello");     s.push("world");     s.push("!");     system.out.println("strings:" + s); } }

please find below code. did override tostring method print nodes item.

now inputting 1,2,3 print strings:3 -> 2 -> 1 output.. hope helps

public class stackreversal {  private class node {         private string item;     private node next; }  private node first = null;  public boolean isempty() {     return (first == null); }  public void push(string s) {     node node = new node();     node.item = s;     node.next = first;      first = node; }  public string pop() {     if (first == null)         throw new runtimeexception("stack empty!");     string result = first.item;     first = first.next;     return result;  }  public string popstring() {     string result = "";     node current = first;      while (current != null) {         result += current.item;         current = current.next;     }     return result; }  /*  * (non-javadoc)  *   * @see java.lang.object#tostring()  *   * method prints nodes in reerse order  */ @override public string tostring() {      stringbuilder nodes = new stringbuilder();      node node = first;      while (node != null) {         nodes.append(node.item).append(" -> ");         node = node.next;     }    if(isempty()) {         return "";     } else {         return nodes.tostring().substring(0, nodes.tostring().length() - 4);         } }  public static void main(string[] args) {     stackreversal s = new stackreversal();     s.push("1");     s.push("2");     s.push("3");     system.out.println("strings:" + s); }

}


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