Solved

ArrayList trick

Posted on 2009-07-13
5
330 Views
Last Modified: 2013-12-29
I have two Strings .

d1="40-60-70"; // the data are id values basically

d2="60-70-80"; // the data are id values basically

I want to make an ArrayList with id's which are not present in d2 but in d1.

So, my expected output is ArrayList {"40"}


whats the easiest way to do this ?
0
Comment
Question by:cofactor
5 Comments
 
LVL 23

Assisted Solution

by:Ajay-Singh
Ajay-Singh earned 50 total points
ID: 24839573
You can use the following,
1. Split the string by "-", So you will get an array
2. Sort the array
3. Iterate over array to find out the missing element(s)
0
 
LVL 20

Accepted Solution

by:
a_b earned 60 total points
ID: 24839585
1. Tokenize str1 and store in arrayList1
2. Tokenize str2 and store in arrayList2
3. for each token in arrayList1 check arrayList2.contains(token)
4. for each token in arrayList2 check arrayList1.contains(token)
5. Do processing accordingly
0
 
LVL 1

Expert Comment

by:nitin22
ID: 24839598
Check if this helps!

import java.util.Set;
import java.util.TreeSet;
 
public class Main {
  public static <T> Set<T> union(Set<T> setA, Set<T> setB) {
    Set<T> tmp = new TreeSet<T>(setA);
    tmp.addAll(setB);
    return tmp;
  }
 
  public static <T> Set<T> intersection(Set<T> setA, Set<T> setB) {
    Set<T> tmp = new TreeSet<T>();
    for (T x : setA)
      if (setB.contains(x))
        tmp.add(x);
    return tmp;
  }
 
  public static <T> Set<T> difference(Set<T> setA, Set<T> setB) {
    Set<T> tmp = new TreeSet<T>(setA);
    tmp.removeAll(setB);
    return tmp;
  }
 
  public static <T> Set<T> symDifference(Set<T> setA, Set<T> setB) {
    Set<T> tmpA;
    Set<T> tmpB;
 
    tmpA = union(setA, setB);
    tmpB = intersection(setA, setB);
    return difference(tmpA, tmpB);
  }
 
  public static <T> boolean isSubset(Set<T> setA, Set<T> setB) {
    return setB.containsAll(setA);
  }
 
  public static <T> boolean isSuperset(Set<T> setA, Set<T> setB) {
    return setA.containsAll(setB);
  }
 
  public static void main(String args[]) {
    TreeSet<Character> set1 = new TreeSet<Character>();
    TreeSet<Character> set2 = new TreeSet<Character>();
 
    set1.add('A');
    set1.add('B');
    set1.add('C');
    set1.add('D');
 
    set2.add('C');
    set2.add('D');
    set2.add('E');
    set2.add('F');
 
    System.out.println("set1: " + set1);
    System.out.println("set2: " + set2);
 
    System.out.println("Union: " + union(set1, set2));
    System.out.println("Intersection: " + intersection(set1, set2));
    System.out.println("Difference (set1 - set2): " + difference(set1, set2));
    System.out.println("Symmetric Difference: " + symDifference(set1, set2));
 
    TreeSet<Character> set3 = new TreeSet<Character>(set1);
 
    set3.remove('D');
    System.out.println("set3: " + set3);
 
    System.out.println("Is set1 a subset of set2? " + isSubset(set1, set3));
    System.out.println("Is set1 a superset of set2? " + isSuperset(set1, set3));
    System.out.println("Is set3 a subset of set1? " + isSubset(set3, set1));
    System.out.println("Is set3 a superset of set1? " + isSuperset(set3, set1));
 
  }
}

Open in new window

0
 
LVL 1

Expert Comment

by:nitin22
ID: 24839607
Your program will populate the sets by tokenizing the strings that you have.
0
 
LVL 8

Assisted Solution

by:ozlevanon
ozlevanon earned 40 total points
ID: 24840548
Here is a code to do that.
Note that the first list is created with new since Arrays.asList returns an immutable list, and we want to remove items from it.
			String d1="40-60-70"; // the data are id values basically
			String d2="60-70-80"; // the data are id values basically
			List<String> list1 = new ArrayList<String>(Arrays.asList(d1.split("-")));
			List<String> list2 = Arrays.asList(d2.split("-"));
			list1.removeAll(list2);

Open in new window

0

Featured Post

VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Should localization be done inside spring controller 5 26
varialbe initialization 11 33
Java: anonymous class 4 20
Crystal Reports Licensing Questions 4 12
For customizing the look of your lightweight component and making it look opaque like it was made of plastic.  This tip assumes your component to be of rectangular shape and completely opaque.   (CODE)
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question