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AscendingNumberComparator.java
TreeSetExample.java
https://www.youtube.com/watch?v=7yIusjCSJkQ&list=UUhwKlOVR041tngjerWxVccw
AscendingNumberComparator.java
import java.util.Comparator; public class AscendingNumberComparator implements Comparator<Integer> { /* * This method used to arrange the numbers in ascending order. */ @Override public int compare(Integer number1, Integer number2) { System.out .print("Compare method has been called in AscendingNumberComparator, to arrange" + " the numbers in ascending order : "); System.out.println("number1 = " + number1 + ", number2 = " + number2 + "\n"); if (number1 < number2) { return -1; } else { return +1; } } }
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. */ AscendingNumberComparator ascendingNumberComparator = new AscendingNumberComparator(); TreeSet<Integer> treeSet = new TreeSet<Integer>( ascendingNumberComparator); System.out.println(20 + " is going to be add in treeSet"); treeSet.add(20); System.out.println(40 + " is going to be add in treeSet"); treeSet.add(40); System.out.println(30 + " is going to be add in treeSet"); treeSet.add(30); System.out.println(10 + " is going to be add in treeSet"); treeSet.add(10); System.out.println("treeSet : " + treeSet + "\n"); } }
20 is going to be add in treeSet Compare method has been called in AscendingNumberComparator, to arrange the numbers in ascending order : number1 = 20, number2 = 20 40 is going to be add in treeSet Compare method has been called in AscendingNumberComparator, to arrange the numbers in ascending order : number1 = 40, number2 = 20 30 is going to be add in treeSet Compare method has been called in AscendingNumberComparator, to arrange the numbers in ascending order : number1 = 30, number2 = 20 Compare method has been called in AscendingNumberComparator, to arrange the numbers in ascending order : number1 = 30, number2 = 40 10 is going to be add in treeSet Compare method has been called in AscendingNumberComparator, to arrange the numbers in ascending order : number1 = 10, number2 = 30 Compare method has been called in AscendingNumberComparator, to arrange the numbers in ascending order : number1 = 10, number2 = 20 treeSet : [10, 20, 30, 40]
https://sites.google.com/site/javaee4321/java-collections/TreeSetDemoAscNumbersComparator.zip?attredirects=0&d=1
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