Add blogpost example for the arraylist in java

gauravkukade · gauravkukade · commit 3f27168a6371 · 2021-12-17T20:03:04.000+05:30
diff --git a/collections/arraylist/arraylist-addall-method-in-java/ArrayListAddAllExample.java b/collections/arraylist/arraylist-addall-method-in-java/ArrayListAddAllExample.java
@@ -0,0 +1,41 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A Java program to add all elements of the specified collection
+ * to the end of the ArrayList
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListAddAllExample {
+
+	public static void main(String[] args) {
+		
+		// ArrayList contains actresses
+		List<String> actresses1 = new ArrayList<String>();
+		
+		actresses1.add("Natalie Portman");
+		actresses1.add("Abigail Anderson");
+		actresses1.add("Jennifer Lawrence");
+		
+		System.out.println("Actresses collection 1: \n"+ actresses1 );
+		
+		// ArrayList contains actresses
+		List<String> actresses2 = new ArrayList<String>();
+		
+		
+		
+		actresses2.add("Angelina Jolie");
+		actresses2.add("Scarlett Johansson");
+		
+		System.out.println("Actresses collection 2: \n"+ actresses2);
+		
+		// Add actresses2 collections all elements to actresses1 collection using addAll()method
+		actresses1.addAll(actresses2);
+		
+		System.out.println("Actresses : \n"+ actresses1);
+	}
+}
diff --git a/collections/arraylist/arraylist-addall-method-in-java/ArrayListAddAllExample2.java b/collections/arraylist/arraylist-addall-method-in-java/ArrayListAddAllExample2.java
@@ -0,0 +1,43 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A Java program to add all elements of the specified collection
+ * to the ArrayList from a particular index 
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListAddAllExample2 {
+
+	public static void main(String[] args) {
+		
+		// ArrayList containing entrepreneurs
+		List<String> entrepreneurs1 = new ArrayList<String>();
+		
+		entrepreneurs1.add("Bill Gates");
+		entrepreneurs1.add("Steve Jobs");
+		entrepreneurs1.add("Jeff Bezos");
+		entrepreneurs1.add("Richard Branson");
+		entrepreneurs1.add("Mark Cuban");
+		
+		System.out.println("Entrepreneurs collection 1: \n"+ entrepreneurs1 );
+		
+		// ArrayList containing entrepreneurs
+		List<String> entrepreneurs2 = new ArrayList<String>();
+		
+		entrepreneurs2.add("Mark Zuckerberg");
+		entrepreneurs2.add("Larry Page");
+		entrepreneurs2.add("Larry Ellison");
+		
+		System.out.println("Entrepreneurs collection 2: \n"+ entrepreneurs2);
+		
+		// Add entrepreneurs2 collections all elements to entrepreneurs1 collection
+		// starting from index 2
+		entrepreneurs1.addAll(2, entrepreneurs2);
+		
+		System.out.println("Entrepreneurs : \n"+ entrepreneurs1);
+	}
+}
diff --git a/collections/arraylist/arraylist-indexOf-method/ArrayListIndexOfExample.java b/collections/arraylist/arraylist-indexOf-method/ArrayListIndexOfExample.java
@@ -0,0 +1,38 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to explain the indexOf() method
+ * of the arrayList class in java.
+ * 
+ * @author Gaurav Kukade
+ */
+public class ArrayListIndexOfExample {
+
+	public static void main(String[] args) {
+		
+		// create an empty arraylist object 'states'
+		List<String> states = new ArrayList<String>();
+
+		// add state in the arraylist, Florida multiple times
+		states.add("California");
+		states.add("Texas");
+		states.add("Florida");
+		states.add("Florida");
+		states.add("New Jersey");
+		states.add("Washington");
+		states.add("Florida");
+		
+		int index = states.indexOf("Florida");
+		
+		//prints index of the first occurrences of Florida i.e. 2
+		System.out.println("The index of the Florida: "+ index);
+		
+		//trying get the index of element, which is not present
+		int index2 = states.indexOf("Alaska");
+		
+		System.out.println("The index of the Alaska: " + index2);
+	}
+}
diff --git a/collections/arraylist/arraylist-lastindexof-method/ArrayListLastIndexOfExample.java b/collections/arraylist/arraylist-lastindexof-method/ArrayListLastIndexOfExample.java
@@ -0,0 +1,39 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to explain the indexOf() method
+ * of the arrayList class in java.
+ * 
+ * @author Gaurav Kukade
+ */
+public class ArrayListLastIndexOfExample {
+	
+public static void main(String[] args) {
+		
+		// create an empty arraylist object 'states'
+		List<String> states = new ArrayList<String>();
+
+		// add state in the arraylist, Florida multiple times
+		states.add("California");
+		states.add("Texas");
+		states.add("Florida");
+		states.add("Florida");
+		states.add("New Jersey");
+		states.add("Washington");
+		states.add("Florida");
+		
+		int index = states.lastIndexOf("Florida");
+		
+		//prints index of the last occurrences of Florida i.e. 6
+		System.out.println("The last index of the Florida: "+ index);
+		
+		//trying get the index of element, which is not present
+		int index2 = states.lastIndexOf("Alaska");
+		
+		System.out.println("The index of the Alaska: " + index2);
+	}
+
+}
diff --git a/collections/arraylist/arraylist-retainall-method/ArrayListRetainAllExample.java b/collections/arraylist/arraylist-retainall-method/ArrayListRetainAllExample.java
@@ -0,0 +1,51 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to to eplain the retainAll() method of the Arraylist class.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListRetainAllExample {
+
+	public static void main(String[] args) {
+
+		//create an empty arraylist of Integer to retain elements
+		List<Integer> numbers1 = new ArrayList<Integer>();
+
+		//add number to the list
+		numbers1.add(4);
+		numbers1.add(5);
+		numbers1.add(6);
+		
+		
+		//create an empty arraylist of Integer
+		List<Integer> numbers2 = new ArrayList<Integer>();
+
+		// add number to the list
+		numbers2.add(1);
+		numbers2.add(2);
+		numbers2.add(3);
+		numbers2.add(4);
+		numbers2.add(5);
+		numbers2.add(6);
+		numbers2.add(7);
+		numbers2.add(8);
+		numbers2.add(9);
+		
+
+		System.out.println("Lists before the method call");
+		System.out.println("numbers1: "+ numbers1);
+		System.out.println("numbers2: "+ numbers2);
+		
+		//retain all the elements of numbers1 in the list numbers2
+		numbers2.retainAll(numbers1);
+		
+		System.out.println("\nLists after the method call");
+		System.out.println("numbers1: "+ numbers1);
+		System.out.println("numbers2: "+ numbers2);	
+	}
+}
diff --git a/collections/arraylist/arraylist-retainall-method/RetainAllNullPointerExceptionExample.java b/collections/arraylist/arraylist-retainall-method/RetainAllNullPointerExceptionExample.java
@@ -0,0 +1,39 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * A java program to show the NullPointerException in retainAll() method
+ * of the arrayList class.
+ *  
+ * @author gaurav
+ *
+ */
+public class RetainAllNullPointerExceptionExample {
+
+	public static void main(String[] args) {
+		
+		//create an empty arraylist of Integer to retain elements
+		List<String> numbers1 = null;
+
+		//create an empty arraylist of Integer
+		List<Integer> numbers2 = new ArrayList<Integer>();
+
+		// add number to the list
+		numbers2.add(1);
+		numbers2.add(2);
+		numbers2.add(3);
+		numbers2.add(4);
+
+		System.out.println("Lists before the method call");
+		System.out.println("numbers1: "+ numbers1);
+		System.out.println("numbers2: "+ numbers2);
+		
+		//retain all the elements of numbers1 in the list numbers2
+		numbers2.retainAll(numbers1);
+		
+		System.out.println("\nLists after the method call");
+		System.out.println("numbers1: "+ numbers1);
+		System.out.println("numbers2: "+ numbers2);	
+	}
+}
diff --git a/collections/arraylist/sublist-method-in-arraylist/ArrayListSubListExample.java b/collections/arraylist/sublist-method-in-arraylist/ArrayListSubListExample.java
@@ -0,0 +1,33 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to explain the subList() method of the ArrayList class in Java
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListSubListExample {
+
+	public static void main(String[] args) {
+
+		// create an empty arraylist object 'states'
+		List<String> states = new ArrayList<String>();
+
+		// add state in the arraylist
+		states.add("California");
+		states.add("Texas");
+		states.add("Florida");
+		states.add("New Jersey");
+		states.add("Washington");
+		
+		System.out.println("The states list: \n"+ states);
+		
+		// sublist the states list from 1 to 3 index
+		List<String> statesSubList = states.subList(1, 3);
+		
+		System.out.println("\nThe states sublist from index 1 (inclusive) to 3 (exclusive): \n"+ statesSubList);
+	}
+}
diff --git a/collections/arraylist/sublist-method-in-arraylist/SubListMethodExceptionExample1.java b/collections/arraylist/sublist-method-in-arraylist/SubListMethodExceptionExample1.java
@@ -0,0 +1,32 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to explain the subList() methods 
+ * IndexOutOfBoundsException exception case.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ */
+public class SubListMethodExceptionExample1 {
+
+	public static void main(String[] args) {
+		// create an empty arraylist object 'states'
+		List<String> states = new ArrayList<String>();
+
+		// add state in the arraylist
+		states.add("California");
+		states.add("Texas");
+		states.add("Florida");
+		states.add("New Jersey");
+		states.add("Washington");
+		
+		System.out.println("The states list: \n"+ states);
+		
+		// will throw IndexOutOfBoundsException
+		List<String> statesSubList = states.subList(1, 7); 
+		
+		System.out.println("\nThe states sublist from index 1 (inclusive) to 3 (exclusive): \n"+ statesSubList);
+	}
+}
diff --git a/collections/arraylist/sublist-method-in-arraylist/SubListMethodExceptionExample2.java b/collections/arraylist/sublist-method-in-arraylist/SubListMethodExceptionExample2.java
@@ -0,0 +1,32 @@
+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to explain the subList() methods 
+ * IllegalArgumentException exception case.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ */
+public class SubListMethodExceptionExample2 {
+
+	public static void main(String[] args) {
+		// create an empty arraylist object 'states'
+		List<String> states = new ArrayList<String>();
+
+		// add state in the arraylist
+		states.add("California");
+		states.add("Texas");
+		states.add("Florida");
+		states.add("New Jersey");
+		states.add("Washington");
+		
+		System.out.println("The states list: \n"+ states);
+		
+		// will throw IllegalArgumentException
+		List<String> statesSubList = states.subList(3, 1); 
+		
+		System.out.println("\nThe states sublist from index 1 (inclusive) to 3 (exclusive): \n"+ statesSubList);
+	}
+}
