SetDemo.java Source code

Introduction

Here is the source code for SetDemo.java

Source

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

class SetDemo {
    public static void main(String[] args) {
        String[] letters = { "A", "B", "C", "D", "E" };

        Set s = new HashSet();

        for (int i = 0; i < letters.length; i++)
            s.add(letters[i]);

        if (!s.add(letters[0]))
            System.out.println("Cannot add a duplicate.\n");

        Iterator iter = s.iterator();
        while (iter.hasNext())
            System.out.println(iter.next());

        System.out.println("");

        SortedSet ss = new TreeSet();

        for (int i = 0; i < letters.length; i++)
            ss.add(letters[i]);

        if (!ss.add(letters[0]))
            System.out.println("Cannot add a duplicate.\n");

        iter = ss.iterator();
        while (iter.hasNext())
            System.out.println(iter.next());
    }
}