Merge pull request codec-akash#13 from AnkitDua123/master

codec-akash · web-flow · commit 431dfbaf87d6 · 2020-10-01T09:04:05.000+05:30
Added Collection ArrayList program
diff --git a/ArrayLists.java b/ArrayLists.java
@@ -0,0 +1,82 @@
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.ListIterator;
+
+public class ArrayLists {
+	public static final Integer[] i = new Integer[] { 10, 20, 30 }; 			// [0,20,30]
+	public static final Integer[] j = new Integer[] { 60, 70 }; 				// [60,70]
+	public static final Integer[] k = new Integer[] { 80, 90 };					// [80,90]
+
+	public static void main(String[] args) {
+
+//		Create/Initialize List (default)
+		List<Integer> ls_default = new ArrayList<Integer>(); 					// []
+//		Create/Initialize List with initial capacity 10	
+		List<Integer> ls_initial_size = new ArrayList<Integer>(10); 			// [ , , , , , , , , , ]
+//		Create/Initialize List with existing Collection			
+		List<Integer> ls_collection = new ArrayList<>(Arrays.asList(i)); 		// [0,20,30]
+
+//-----Add Values-------------//
+		ls_collection.add(50); 													// [0,20,30,50]
+		ls_collection.add(3, 40); 												// [0,20,30,40,50]
+		ls_collection.addAll(Arrays.asList(k)); 								// [0,20,30,40,50,80,90]
+		ls_collection.addAll(5, Arrays.asList(j)); 								// [0,20,30,40,50,60,70,80,90]
+
+//-----Size--------//
+		ls_collection.size(); 													// 9
+		ls_collection.isEmpty(); 												// false
+
+//-----Find elements----//
+		ls_collection.indexOf(30); 												// 2
+		ls_collection.lastIndexOf(50); 											// 4
+		ls_collection.contains(90); 											// true
+		ls_collection.containsAll(Arrays.asList(i)); 							// true
+
+//-----Get and set elements-----//
+		ls_collection.get(4); 													// 30
+		ls_collection.set(0, 10); 												// [10,20,30,40,50,60,70,80,90]
+		ls_collection.subList(0, 3);											// [10, 20, 30]
+
+//-----Loop over each List item----//
+		System.out.println(ls_collection.toString()); 							// [10, 20, 30, 40, 50, 60, 70, 80, 90]
+
+		ls_collection.forEach((val) -> System.out.print(val + " ")); 			// 10 20 30 40 50 60 70 80 90
+		System.out.println();
+
+		for (Integer val : ls_collection) {
+			System.out.print(val + " ");
+		} 																		// 10 20 30 40 50 60 70 80 90
+		System.out.println();
+
+		ListIterator<Integer> it = ls_collection.listIterator();
+		while (it.hasNext()) {
+			System.out.print(it.next() + " ");
+		} 																		// 10 20 30 40 50 60 70 80 90
+		System.out.println();
+
+//-----Remove elements----//
+		ls_collection.remove(0); 												// [20,30,40,50,60,70,80,90]
+		ls_collection.remove(ls_collection.size() - 1); 						// [20,30,40,50,60,70,80]
+		ls_collection.remove(ls_collection.indexOf(20)); 						// [30,40,50,60,70,80]
+		ls_collection.removeAll(Arrays.asList(j)); 								// [30,40,50,80]
+		ls_collection.clear(); 													// []
+
+//----Sort---//
+		ls_default.add(60);
+		ls_default.add(20);
+		ls_default.add(80);
+		ls_default.add(10);
+		Collections.sort(ls_default);											// [10, 20, 60, 80]
+		Collections.sort(ls_default, Collections.reverseOrder());				// [80, 60, 20, 10]
+		Collections.sort(ls_default, new Comparator<Integer>() {
+			@Override
+			public int compare(Integer a, Integer b) {
+				return a.compareTo(b);
+			}
+		});																		// [10, 20, 60, 80]
+	}
+}
