Add arraylist java programs

Author: gauravkukade

collections/arraylist/README.md

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+# Java Collections - ArrayList in Java
+
+This module contains articles related to ArrayList in Java.
+
+## Related articles
+
+- [ArrayList In Java](https://coderolls.com/arraylist-in-java/)
+- [How To Add An Element To ArrayList In Java?](https://coderolls.com/add-element-in-arraylist/)
+- [How To Change An Element In ArrayList?](https://coderolls.com/change-element-in-arraylist/)
+- [How To Remove An Element From An ArrayList?](https://coderolls.com/remove-element-from-arraylist/)
+- [Iterating the ArrayList In Java](https://coderolls.com/iterating-the-arraylist-in-java/)
+
+
+Visit [coderolls](https://coderolls.com/) to read more tutorials.

collections/arraylist/add-element-in-arraylist/ArrayListAddExample.java

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+package ArrayListAddExample;
+
+import java.util.ArrayList;
+
+/**
+ * A Java program to add an element at the specific index.
+ * 
+ * The add(int index, E element) method will add 
+ * an element at the specified index in ArrayList.
+ * 
+ * @author Guarav Kukade at coderolls.com
+ *
+ */
+public class ArrayListAddExample {
+
+	public static void main(String[] args) {
+		
+		ArrayList<String> arrayList = new ArrayList<String>();
+		
+		//adding elements to the arrayList using normal add method
+		arrayList.add("Gaurav");
+		arrayList.add("Shyam");
+		
+		System.out.println(arrayList);// [Gaurav, Shyam]
+		
+		// adding an element to  the arrayList at index 1
+		arrayList.add(1, "Saurav");
+		
+		System.out.println(arrayList); // [Gaurav, Saurav, Shyam]
+
+	}
+
+}

collections/arraylist/add-element-in-arraylist/ArrayListExample.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+
+/**
+ * A Java program to add an element to the list.
+ * 
+ * The add(E e) method will add an element to 
+ * the end of the arrayList.
+ * 
+ * @author Guarav Kukade at coderolls.com
+ *
+ */
+public class ArrayListExample {
+
+	public static void main(String[] args) {
+		
+		ArrayList<String> arrayList = new ArrayList<String>();
+		
+		//adding elements to the arrayList
+		arrayList.add("Gaurav");
+		arrayList.add("Shyam");
+		
+		System.out.println(arrayList);// [Gaurav, Shyam]
+		
+		// adding an element to  the arrayList
+		// element will be added to the end of the arrayList
+		arrayList.add("Saurav");
+		
+		System.out.println(arrayList); // [Gaurav, Shyam, Saurav]
+
+	}
+
+}

collections/arraylist/arraylist-in-java/ArrayListDuplicate.java

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+package com.gaurav.ExProject;
+
+import java.util.ArrayList;
+
+public class ArrayListDuplicate {
+
+	public static void main(String[] args) {
+		ArrayList<String> arrayList = new ArrayList<String>();
+		
+		arrayList.add("Gaurav");
+		arrayList.add("Shyam");
+		arrayList.add("Saurav");
+		arrayList.add("Samiksha");
+		arrayList.add("Rina");
+		arrayList.add("Rina");
+		
+		System.out.println(arrayList);
+
+	}
+}

collections/arraylist/arraylist-in-java/ArrayListExample.java

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+package com.gaurav.ExProject;
+
+import java.util.ArrayList;
+
+/**
+ * A Java program showing arraylist maintains the insertion order.
+ * 
+ * @author gaurav
+ *
+ */
+public class ArrayListExample {
+
+	public static void main(String[] args) {
+		
+		ArrayList<String> arrayList = new ArrayList<String>();
+		
+		arrayList.add("Gaurav");
+		arrayList.add("Shyam");
+		arrayList.add("Saurav");
+		arrayList.add("Samiksha");
+		arrayList.add("Rina");
+		
+		System.out.println(arrayList);
+	}
+
+}

collections/arraylist/change-element-in-arraylist/ArrayListSetExample.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+
+/**
+ * A java program to change an element at 
+ * particular index in ArrayList.
+ * 
+ * We can use 'public E set(int index, E element)' method
+ * to change an element.
+ * 
+ * @author Guarav Kukade at coderolls.com
+ *
+ */
+public class ArrayListSetExample {
+
+	public static void main(String[] args) {
+ArrayList<String> arrayList = new ArrayList<String>();
+		
+		//adding elements to the arrayList using normal add method
+		arrayList.add("Gaurav");
+		arrayList.add("Shyam");
+		arrayList.add("Pradnya");
+		
+		System.out.println(arrayList);// [Gaurav, Shyam, Pradnya]
+		
+		// change an element at index 1
+		arrayList.set(1, "Saurav");
+		
+		System.out.println(arrayList); // [Gaurav, Saurav, Pradnya]
+
+	}
+
+}

collections/arraylist/iterating-the-arraylist-in-java/ArrayListIterateExample1.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to iterate through arraylist 
+ * using the basic for loop.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListIterateExample1 {
+    
+    public static void main (String[] args) {
+        
+        List<String> list = new ArrayList<String>();
+        
+        list.add("Monday");
+        list.add("Tuesday");
+        list.add("Wednesday");
+        list.add("Thursday");
+        list.add("Friday");
+        list.add("Saturday");
+        list.add("Sunday");
+        
+        System.out.println("Iterating through ArrayList using the basic for loop.......\n");
+        
+        for(int i =0; i <list.size(); i++){
+            System.out.println("Object form the ArrayList at "+ i + " is " + list.get(i));
+        }
+    }
+}

collections/arraylist/iterating-the-arraylist-in-java/ArrayListIterateExample2.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to iterate through arraylist 
+ * using enhanced for loop i.e. For-each loop.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListIterateExample2 {
+    
+    public static void main (String[] args) {
+        
+        List<String> list = new ArrayList<String>();
+        
+        list.add("Monday");
+        list.add("Tuesday");
+        list.add("Wednesday");
+        list.add("Thursday");
+        list.add("Friday");
+        list.add("Saturday");
+        list.add("Sunday");
+        
+        System.out.println("Iterating through ArrayList using enhanced for loop i.e. For-each loop.......\n");
+        
+        for(String str:list){
+        	//we get 'str' in for-each loop
+            System.out.println("Object form the ArrayList is " + str);
+        }
+    }
+}

collections/arraylist/iterating-the-arraylist-in-java/ArrayListIterateExample3.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to iterate through arraylist 
+ * using while loop.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListIterateExample3 {
+    
+    public static void main (String[] args) {
+        
+        List<String> list = new ArrayList<String>();
+        
+        list.add("Monday");
+        list.add("Tuesday");
+        list.add("Wednesday");
+        list.add("Thursday");
+        list.add("Friday");
+        list.add("Saturday");
+        list.add("Sunday");
+        
+        System.out.println("Iterating through ArrayList using while loop.......\n");
+        
+        int i=0;
+        // while loop condition will be true till i is less the the list size
+        while (list.size()>i) {
+        	System.out.println("Object form the ArrayList at "+ i + " is " + list.get(i));
+        	i++;
+		}
+    }
+}

collections/arraylist/iterating-the-arraylist-in-java/ArrayListIterateExample4.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * A java program to iterate through arraylist 
+ * using Iterator interface.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListIterateExample4 {
+    
+    public static void main (String[] args) {
+        
+        List<String> list = new ArrayList<String>();
+        
+        list.add("Monday");
+        list.add("Tuesday");
+        list.add("Wednesday");
+        list.add("Thursday");
+        list.add("Friday");
+        list.add("Saturday");
+        list.add("Sunday");
+        
+        System.out.println("Iterating through ArrayList using Iterator interface........\n");
+        
+        // getting iterator
+        Iterator iterator = list.iterator();
+        
+        // hasNext() returns true only if object is available at next call
+        while (iterator.hasNext()) {
+        	
+        	//next() returns obejct, we can cast it to reuqired type
+        	String str = (String) iterator.next();
+        	System.out.println("Object form the ArrayList is " + str);
+		}
+    }
+}

collections/arraylist/iterating-the-arraylist-in-java/ArrayListIterateExample5.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A java program to iterate through arraylist 
+ * using forEach method and lamda expression.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListIterateExample5 {
+    
+    public static void main (String[] args) {
+        
+        List<String> list = new ArrayList<String>();
+        
+        list.add("Monday");
+        list.add("Tuesday");
+        list.add("Wednesday");
+        list.add("Thursday");
+        list.add("Friday");
+        list.add("Saturday");
+        list.add("Sunday");
+        
+        System.out.println("Iterating through ArrayList using forEach method and lamda expression........\n");
+        
+        // add lambda expressionin the foreach loop
+        list.forEach(s -> System.out.println("Object form the ArrayList is "+ s));
+    }
+}

collections/arraylist/remove-element-from-arraylist/ArrayListRemoveExample.java

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+package com.gaurav.ExProject.ArrayList;
+
+import java.util.ArrayList;
+
+/**
+ * A Java program to remove an element from ArrayList
+ * using the remove(Object o) method.
+ * 
+ * @author Gaurav Kukade at coderolls.com
+ *
+ */
+public class ArrayListRemoveExample {
+
+	public static void main(String[] args) {
+		
+		ArrayList<String> arrayList = new ArrayList<String>();
+		
+		//adding elements to the arrayList using normal add method
+		arrayList.add("Red");
+		arrayList.add("Green");
+		arrayList.add("Pink");
+		
+		System.out.println("ArrayList before removing an element"+ arrayList); // ArrayList before removing an element[Red, Green, Pink]
+		
+		//Remove "Pink" from the arrayList
+		arrayList.remove("Pink");
+		
+		System.out.println("ArrayList after removing an element"+ arrayList);// ArrayList after removing an element[Red, Green]
+	}
+}