CODEWITHSUNDEEP
javasearchlinked-listnodes
mancini13
mancini13

Reputation: 35

Searching in linked list with scanner in java

I want to search in linked list with scanner but i cannot do it. I can search without scanner. What is wrong with this code?

My search method:

    public void Search(Object data){
    Node tmp = head ;
    while(tmp != null ){

        if(tmp.getData() == data){
            System.out.println("Your input is in the list");
        }

            tmp = tmp.getNext();


    }

}

And my main class:

  public static void main(String[] args) throws ParseException {
    LinkedList list =new Linkedlist();
    ...... // adding methods etc.
    Scanner input = new Scanner(System.in);
    System.out.println("Enter your input: ");
    String x=input.next();
    list.Search(x);
}

Upvotes: 0

Views: 1707

Answers (2)

sihao
sihao

Reputation: 431

To build on what Adam has suggested, you can consider the following code:

public void Search(String data){

     Node tmp = head ;
     while(tmp != null ){

         if(tmp.getData().equalsIgnoreCase(data)){
             System.out.println("Your input is in the list");
         }

            tmp = tmp.getNext();
     }   
}

You should use .equals() or .equalsIgnoreCase() to compare the string instead of comparing by == which compares each other as objects.

What is the difference between == vs equals() in Java?

Upvotes: 1

Adam S
Adam S

Reputation: 76

You are passing the String parameter into search(data), which is being cast as an Object.

You will need to either type-cast the Object data parameter to type String, or change the method signature to explicitly accept type String

Upvotes: 1

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