Java ArrayList Insert/Replace At Index

Author: JavaProgramTo.com

src/main/java/com/javaprogramto/java8/arraylist/insert/ArrayListInsertAddExample.java

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+package com.javaprogramto.java8.arraylist.insert;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayListInsertAddExample {
+
+	public static void main(String[] args) {
+
+		List<Integer> list1 = new ArrayList<>();
+
+		list1.add(10);
+		list1.add(20);
+		list1.add(30);
+		list1.add(40);
+		list1.add(50);
+		list1.add(60);
+
+		System.out.println("List values before insertion - " + list1);
+		System.out.println("list1 size before - "+list1.size());
+
+		list1.add(3, 333);
+
+		System.out.println("List values after inserting the value 333 at index 3 - " + list1);
+		System.out.println("list1 size after - "+list1.size());
+	}
+}

src/main/java/com/javaprogramto/java8/arraylist/insert/ArrayListInsertAddExample2.java

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+package com.javaprogramto.java8.arraylist.insert;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayListInsertAddExample2 {
+
+	public static void main(String[] args) {
+
+		List<String> list2 = new ArrayList<>();
+
+		list2.add("one");
+		list2.add("two");
+		list2.add("three");
+		list2.add("four");
+		list2.add("five");
+		list2.add("six");
+
+		System.out.println("List2 values before insertion - " + list2);
+		System.out.println("list2 size before - "+list2.size());
+
+		list2.add(3, "new four");
+
+		System.out.println("List2 values after inserting the value 333 at index 3 - " + list2);
+		System.out.println("list2 size after - "+list2.size());
+	}
+}

src/main/java/com/javaprogramto/java8/arraylist/insert/ArrayListUpdateSetExample3.java

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+package com.javaprogramto.java8.arraylist.insert;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayListUpdateSetExample3 {
+
+	public static void main(String[] args) {
+
+		List<Integer> list1 = new ArrayList<>();
+
+		list1.add(10);
+		list1.add(20);
+		list1.add(30);
+		list1.add(40);
+		list1.add(50);
+		list1.add(60);
+
+		System.out.println("List1 values before update - " + list1);
+		System.out.println("list1 size before - "+list1.size());
+
+		list1.set(3, 333);
+
+		System.out.println("List1 values after updating index 3 value with new value 333 - " + list1);
+		System.out.println("list1 size after - "+list1.size());
+	}
+}

src/main/java/com/javaprogramto/java8/arraylist/insert/ArrayListUpdateSetIterateExample4.java

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+package com.javaprogramto.java8.arraylist.insert;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayListUpdateSetIterateExample4 {
+
+	public static void main(String[] args) {
+
+		List<Integer> list1 = new ArrayList<>();
+
+		list1.add(4);
+		list1.add(10);
+		list1.add(24);
+		list1.add(25);
+		list1.add(5);
+		list1.add(28);
+
+		System.out.println("List1 values before update - " + list1);
+		System.out.println("list1 size before - " + list1.size());
+
+		for (int index = 0; index < list1.size(); index++) {
+			if (list1.get(index) % 5 == 0) {
+				list1.set(index, -1);
+			}
+		}
+
+		System.out.println("List1 values after updating index 3 value with new value 333 - " + list1);
+		System.out.println("list1 size after - " + list1.size());
+	}
+}