Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Login         

View Questions and Answers by Category

Advertisements


 
Have Programming Question? Ask it here!
 
 
 


ramachandra
collections
1 Answer(s)      3 years and 6 months ago
Posted in : Java Beginners


1.Create an ArrayList of Object Planet with instance variable name and colour. Add 5 planets to the ArrayList planetList. Sort the ArrayList in ascending order of name and descending order of colour using comparator interface. (Note: Do not use comparable Interface)


Advertisement
View Answers

March 9, 2011 at 4:56 PM


import java.util.*;

class ShowData {
        String name;
        String color;
        ShowData(String name,String color){
        this.name=name;
        this.color=color;
        }
        public void setName(String name){
                this.name = name;
        }
        public String getName() {
                return name;
        }
        public void setGrade(String color) {
                this.color = color;
        }
        public String getColor(){
                return color;
        }
       }

class NameComparator implements Comparator{
    public int compare(Object o1, Object o2){    
       String name1 = ((ShowData)o1).getName();        
       String name2 = ((ShowData)o2).getName();
       return name1.compareTo(name2);
 }
}
class ColorComparator implements Comparator{
    public int compare(Object o1, Object o2){    
       String color1 = ((ShowData)o1).getColor();        
       String color2 = ((ShowData)o2).getColor();
       return color2.compareTo(color1);
 }
}
public class ArrayListEx{
         public static void main(String[] args){
               ArrayList<ShowData> planetList=new ArrayList<ShowData>();
               planetList.add(new ShowData("Mercury","Yellow"));
               planetList.add(new ShowData("Venus","Blue"));
               planetList.add(new ShowData("Earth","Green"));
               planetList.add(new ShowData("Mars","Red"));
               planetList.add(new ShowData("Jupiter","Orange"));
               System.out.println("Sorting according to ascending order of Planet: ");
               Collections.sort(planetList,new NameComparator());
                for(ShowData data: planetList){
               System.out.println(data.getName()+"\t "+data.getColor());
                     }
                     System.out.println();
                System.out.println("Sorting according to descending order of Color: ");
                Collections.sort(planetList,new ColorComparator());
                for(ShowData data: planetList){
               System.out.println(data.getName()+"\t "+data.getColor());
                     }
         }
}


Related Tutorials/Questions & Answers:
Collections
Collections  Hi, Please send a study material on collections.../java/jdk6/introduction-collections-api.shtml http://www.roseindia.net/javacodeexamples/index.shtml http://www.devmanuals.com/tutorials/java/collections/index.html
collections
collections  why we need collections.when we will use collections in our applications
Advertisements
collections
collections  in collections can we perform binarysearch on arraylist elements without sorting them
what is collections?
what is collections?  what is collections
Collections API
Collections API  hello, What is the Collections API?   hi The Collections API is a set of classes and interfaces that support operations on collections of objects
Collections in Java
Collections in Java  What is Concurrent Hash map
Collections in Java
Collections in Java  What is Concurrent Hash map
java collections
java collections  what are all the methods and things added for collections in java5 and java6 please kindly reply me as soon as possible
Collections Framework
Collections Framework  Sir, We know that both HashMap & Hashtable is using for same purposes i.e Used for storing keys-values pair. But there is some difference between this two class that are 1)Hashtable is synchronized
collections in java
collections in java  please explain me the flow of this program..i m getting o/p as 2 1 1..y not 2 1 0..is it that if we change the i2 value,it doesnt remove. import java.util.*; public class Mapit { public static void main
java collections
achieve this plz without using stringtokenizer with any collections!!!  
Hibernate Criteria With Collections Example
Hibernate Criteria With Collections Example  Good code of Hibernate Criteria With Collections Example. Thanks   Example program of using Hibernate Criteria With Collections in your Java project. Check the tutorial
collections - Java Interview Questions
collections   what is the way to insert map values into a set in collections
 

 

 

DMCA.com