collections class methods

Author: sathishmepco

Collections/src/com/cdac/collections/collectionsutils/CollectionsDemo.java

@@ -0,0 +1,73 @@
+package com.cdac.collections.collectionsutils;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class CollectionsDemo {
+	
+	public static void main(String[] args) {
+		ArrayList<String> list = new ArrayList<>();
+		list.add("One");
+		list.add("Two");
+		list.add("One");
+		
+		Set<String> set = new HashSet<>();
+		set.add("Three");
+		set.add("Four");
+		set.add("One");
+		
+		System.out.println(set);
+		set.addAll(list);
+		System.out.println(set);
+		
+		Collections.sort(list);
+		System.out.println("Sort : "+list);
+		Collections.sort(list, Collections.reverseOrder());
+		System.out.println("Reverse Order : "+list);
+		
+		String max = Collections.max(list);
+		System.out.println("Max : "+max);
+		String min = Collections.min(list);
+		System.out.println("Min : "+min);
+		
+		List<Integer> iList = new ArrayList<>();
+		iList.add(10);
+		iList.add(20);
+		iList.add(40);
+		iList.add(30);
+		
+		int index = Collections.binarySearch(iList, 190);
+		System.out.println("Binary Search index is : "+index);
+		
+		ArrayList<Integer> newList = new ArrayList<>();
+		newList.add(11);
+		newList.add(12);
+		newList.add(13);
+		newList.add(14);
+		newList.add(15);
+		Collections.copy(newList, iList); //newList should have the same size as src list
+		System.out.println("Copied List : "+newList);
+		
+		Set<String> emptySet = Collections.emptySet();
+		System.out.println("Empty Set : "+emptySet.size());
+		//emptySet.add("Try");  //not allowed its immutable
+		
+		Collections.replaceAll(iList, 10, 100);
+		System.out.println(iList);
+		
+		Collections.shuffle(iList);
+		System.out.println(iList);
+		
+		Set<String> singletonSet = Collections.singleton("Java");
+		System.out.println(singletonSet);
+//		singletonSet.add("Hello"); //not supported its immutable
+
+		Map<Integer, String> map = new HashMap<>();
+		map = Collections.synchronizedMap(map);
+	}
+}