集合类层次结构关系

import java.util.*;
 
public class Main {
 
	public static void main(String[] args) {
		List<String> a1 = new ArrayList<String>();
		a1.add("Program");
		a1.add("Creek");
		a1.add("Java");
		a1.add("Java");
		System.out.println("ArrayList Elements");
		System.out.print("\t" + a1 + "\n");
 
		List<String> l1 = new LinkedList<String>();
		l1.add("Program");
		l1.add("Creek");
		l1.add("Java");
		l1.add("Java");
		System.out.println("LinkedList Elements");
		System.out.print("\t" + l1 + "\n");
 
		Set<String> s1 = new HashSet<String>(); // or new TreeSet() will order the elements;
		s1.add("Program");
		s1.add("Creek");
		s1.add("Java");
		s1.add("Java");
		s1.add("tutorial");
		System.out.println("Set Elements");
		System.out.print("\t" + s1 + "\n");
 
		Map<String, String> m1 = new HashMap<String, String>(); // or new TreeMap() will order based on keys
		m1.put("Windows", "2000");
		m1.put("Windows", "XP");
		m1.put("Language", "Java");
		m1.put("Website", "programcreek.com");
		System.out.println("Map Elements");
		System.out.print("\t" + m1);
	}
}

ArrayList Elements
	[Program, Creek, Java, Java]
LinkedList Elements
	[Program, Creek, Java, Java]
Set Elements
	[tutorial, Creek, Program, Java]
Map Elements
	{Windows=XP, Website=programcreek.com, Language=Java}

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