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DescendingAlphabetsComparator.java
TreeSetExample.java
https://www.youtube.com/watch?v=jRpTJO-C96o&list=UUhwKlOVR041tngjerWxVccw
DescendingAlphabetsComparator.java
import java.util.Comparator; public class DescendingAlphabetsComparator implements Comparator<String> { /* * This method used to arrange the Alphabets in descending order. */ @Override public int compare( String alphabet1, String alphabet2 ) { System.out .print("Compare method has been called in DescendingAlphabetsComparator, to arrange" + " the Alphabets in descending order : "); System.out .println("alphabet1 = " + alphabet1 + ", alphabet2 = " + alphabet2 + "\n"); return alphabet2.compareTo(alphabet1); } }
import java.util.TreeSet; /* * Example of TreeSet(Comparator<? super E> comparator) Constructor. */ public class TreeSetExample { public static void main(String[] args) { /* * Constructs a new, empty tree set, sorted according to the specified * comparator. * * All elements inserted into the set must be mutually comparable by the * specified comparator: comparator.compare(e1, e2) must not throw a * ClassCastException for any elements e1 and e2 in the set. * * If the user attempts to add an element to the set that violates this * constraint, the add call will throw a ClassCastException. */ DescendingAlphabetsComparator descendingAlphabetsComparator =
new DescendingAlphabetsComparator(); TreeSet<String> treeSet = new TreeSet<String>( descendingAlphabetsComparator); System.out.println("B" + " is going to be add in treeSet"); treeSet.add("B"); System.out.println("C" + " is going to be add in treeSet"); treeSet.add("C"); System.out.println("A" + " is going to be add in treeSet"); treeSet.add("A"); System.out.println("B" + " is going to be add in treeSet"); treeSet.add("D"); System.out.println("treeSet : " + treeSet + "\n"); } }
B is going to be add in treeSet Compare method has been called in DescendingAlphabetsComparator, to arrange the Alphabets in descending order : alphabet1 = B, alphabet2 = B C is going to be add in treeSet Compare method has been called in DescendingAlphabetsComparator, to arrange the Alphabets in descending order : alphabet1 = C, alphabet2 = B A is going to be add in treeSet Compare method has been called in DescendingAlphabetsComparator, to arrange the Alphabets in descending order : alphabet1 = A, alphabet2 = B B is going to be add in treeSet Compare method has been called in DescendingAlphabetsComparator, to arrange the Alphabets in descending order : alphabet1 = D, alphabet2 = B Compare method has been called in DescendingAlphabetsComparator, to arrange the Alphabets in descending order : alphabet1 = D, alphabet2 = C treeSet : [D, C, B, A]
https://sites.google.com/site/javaee4321/java-collections/TreeSetDemoAlphabetsDescComparator.zip?attredirects=0&d=1
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