This the ERROR in Java code during compilation .What is this??

Replies

• 

  komputergeek

  I guess you haven't used try-catch block to catch exception in your program.Please post your program.
• 

  ms_cs

  Post your full code here...It will be easy to debug..
• 

  shalini_goel14

  sahilgandhi87

  Note: ABC1.java uses unchecked or unsafe operations.
  Note: Recompile with -Xlint:unchecked for details.
  
  
  Now when i use :
  
  javac ABC1.java -Xlint
  
  ABC1.java:26: warning: [unchecked] unchecked call to add(E) as a member of
  the raw type java.util.ArrayList
  list1.add(p);
  ^
  1 warning

  This kind of warning you get when you use jdk1.5 to compile but not in actually using "Generics" feature of jdk1.5 properly or when you mix generic collections with non-generic collections and try to "add"(note not on retreive) something to the list that is not type-safe.
  
  See the sample program for this:
  

  package myjava;
  import java.util.*;
  /**
   *
   * @author shalinig
   */
  public class TestBadLegacy {
  public static void main(String args[]){
      List myList = new ArrayList();
      myList.add(4);
      myList.add(6);
      Inserter in =new Inserter();
      in.insert(myList);
  }
  }
  class Inserter{
      void insert(List list){ //you need to use generics here also
          list.add(new String("42"));
      }
  }
  

  So make insert method something like this:
  void insert(List list) rather than void insert(List list)
  
  Hope this may be of any help 😀
  
  Thanks
• 

  shalini_goel14

  Hey Sahil , Is your problem solved? Please devote some time to share the whole problem with solution here? 😀
  
  Thanks