added practice exercises for Sequential Collection in Java

Author: jimmy17x

bin/sequentialCollection/AList.class

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+package sequentialCollection;
+
+import java.util.ArrayList;
+
+public class AList {
+	public static void main(String args[]) {
+		ArrayList<Integer> grades = new ArrayList<Integer>();
+		grades.add(100);
+		grades.add(200);
+		grades.add(300);
+		grades.add(400);
+
+		float total = 0f;
+		// for(int i = 0 ; i < grades.size() ; ++i)
+		// total+= grades.get(i);
+
+		// Collection interface provides us iterator
+		for (Integer i : grades)
+			total += i;
+
+		System.out.println("Size of grades  is " + grades.size());
+		System.out.println("Average grades  is " + total / grades.size());
+		grades.remove(2);
+		System.out.println("New size after removing is " + grades.size());
+		grades.add(60);
+		grades.add(70);
+		System.out.println("New size after inserting is " + grades.size());
+
+
+	}
+
+}

bin/sequentialCollection/AlphaTreeSet.class

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+package sequentialCollection;
+
+import java.util.TreeSet;
+
+public class AlphaTreeSet {
+	public static void main(String args[]) {
+		TreeSet<String> names = new TreeSet<String>();
+		names.add("ozzy");
+		names.add("marshal");
+		names.add("jolly");
+		names.add("jimmy");
+
+		System.out.println("Number of names: " + names.size());
+
+		// all names will print out in sequential manner
+		for (String s : names) {
+			System.out.println(s);
+		}
+		System.out.println("Name before marshal : " + names.lower("marshal"));
+		System.out.println("Name after marshal : " + names.higher("marshal"));
+		System.out.println("Name at first position : " + names.first());
+		System.out.println("Name at last position : " + names.last());
+		
+
+	}
+
+}

bin/sequentialCollection/LinePriorityQueue.class

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+package sequentialCollection;
+
+import java.util.PriorityQueue;
+
+public class LinePriorityQueue {
+
+	public static void main(String[] args) {
+		PriorityQueue<String> line = new PriorityQueue();
+		line.add("Jimmy");
+		line.add("ozzy");
+		line.add("jolly");
+		line.add("marshal");
+
+		System.out.println("The line ");
+		for (String s : line) {
+			System.out.println(s);
+		}
+		
+		line.poll();
+		
+		System.out.println("The line ");
+		for(String s  : line)
+			System.out.println(s);
+		
+		line.remove("marshal");
+		
+		for(String s : line )
+			System.out.println(s);
+		
+		System.out.println("Head of line is : " + line.peek());
+	}
+
+}

bin/sequentialCollection/NamesHashSet.class

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+package sequentialCollection;
+
+import java.util.HashSet;
+
+public class NamesHashSet {
+	public static void main (String args[])
+	{
+		HashSet<String> names = new HashSet<String>();
+		names.add("jimmy");
+		names.add("jolly");
+		
+		System.out.println("The number of names is " + names.size());
+		for(String s : names)
+			System.out.println(s);
+		names.remove("jimmy");
+		names.add("marshal");
+		String name = "marshal";
+		if(names.contains(name))
+			System.out.println(name + " is in hash set collection");
+		else
+			System.out.println(name +  " is not in hash set collection");
+		
+		for(String n  : names )
+			System.out.println(n);
+		names.clear();
+		System.out.println("total names  : "  + names.size());
+		
+	}
+}