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DescendingNameComparator.java
TreeSetExample.java
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DescendingNameComparator.java
import java.util.Comparator; public class DescendingNameComparator implements Comparator<String> { /* * This method used to arrange the names in descending order. */ @Override public int compare( String name1, String name2 ) { System.out .print("Compare method has been called in DescendingNameComparator, to arrange" + " the names in decending order : "); System.out .println("name1 = " + name1 + ", name2 = " + name2 + "\n"); return name2.compareTo(name1); } }
import java.util.TreeSet; /* * Example of TreeSet(Comparator<? super E> comparator) Constructor. */ public class TreeSetExample { public static void main( String[] args ) { DescendingNameComparator decendingNameComparator = new DescendingNameComparator(); /* * 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. */ TreeSet<String> treeSet = new TreeSet<String>(decendingNameComparator); System.out.println("Balu" + " is going to be add in treeSet"); treeSet.add("Balu"); System.out.println("Ajay" + " is going to be add in treeSet"); treeSet.add("Ajay"); System.out.println("David" + " is going to be add in treeSet"); treeSet.add("David"); System.out.println("Charles" + " is going to be add in treeSet"); treeSet.add("Charles"); System.out.println("treeSet : " + treeSet + "\n"); } }
Balu is going to be add in treeSet Compare method has been called in DescendingNameComparator, to arrange the names in decending order : name1 = Balu, name2 = Balu Ajay is going to be add in treeSet Compare method has been called in DescendingNameComparator, to arrange the names in decending order : name1 = Ajay, name2 = Balu David is going to be add in treeSet Compare method has been called in DescendingNameComparator, to arrange the names in decending order : name1 = David, name2 = Balu Charles is going to be add in treeSet Compare method has been called in DescendingNameComparator, to arrange the names in decending order : name1 = Charles, name2 = Balu Compare method has been called in DescendingNameComparator, to arrange the names in decending order : name1 = Charles, name2 = David treeSet : [David, Charles, Balu, Ajay]
https://sites.google.com/site/javaee4321/java-collections/TreeSetDemoNamesDescComparator.zip?attredirects=0&d=1
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