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Commit b5ad313

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Add blopost example for the removeIf, removeAll and isEmpty method of the arrayList in java
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package com.gaurav.ExProject.ArrayList;
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import java.util.ArrayList;
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/**
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* An example java program for an isEmpty method
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* of the ArrayList class in java.
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*
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* @author Gaurav Kukade at coderolls
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*/
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public class ArrayListIsEmptyExample {
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public static void main(String[] args) {
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// create an arraylyst teams
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ArrayList<String> teams = new ArrayList<String>();
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// add elements to the arraylist teams
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teams.add("LA Galaxy");
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teams.add("Orlando City FC");
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teams.add("Portland Timbers");
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teams.add("Columbus Crew");
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boolean isTeamsEmpty = teams.isEmpty();
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if(isTeamsEmpty) {
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System.out.println("Teams arraylist is empty.");
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}
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else {
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System.out.println("Teams arraylist is not empty.");
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}
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// create an arraylist players
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ArrayList<String> players = new ArrayList<String>();
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boolean isPlayersEmpty = players.isEmpty();
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if(isPlayersEmpty) {
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System.out.println("Players arraylist is empty.");
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}
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else {
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System.out.println("Players arraylist is not empty.");
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}
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}
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}
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package com.gaurav.ExProject.ArrayList;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Predicate;
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/**
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* A java program showing an example for the removeAll()
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* method of the ArrayList class in Java.
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*
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* @author gaurav
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*/
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public class ArrayListRemoveAllExample {
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public static void main(String[] args) {
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// create an empty arraylist object 'states'
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List<String> states = new ArrayList<String>();
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// add state in the arraylist, Florida multiple times
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states.add("California");
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states.add("Texas");
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states.add("Montana");
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states.add("Arizona");
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states.add("Florida");
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states.add("Michigan");
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states.add("New Jersey");
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states.add("Washington");
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states.add("Ohio");
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states.add("Minnesota");
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states.add("Colorado");
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states.add("Missouri");
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states.add("Nevada");
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// create another ArrayList for items to be removed
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List<String> statesToBeRemoved = new ArrayList<String>();
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statesToBeRemoved.add("Minnesota");
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statesToBeRemoved.add("Missouri");
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statesToBeRemoved.add("Montana");
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statesToBeRemoved.add("Michigan");
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System.out.println("The states list before the removeAll() method call: \n" + states);
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// removes all elements specified in the ArrayList statesToBeRemoved
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states.removeAll(statesToBeRemoved);
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System.out.println("\nThe states list after the removeAll() method call: \n" + states);
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}
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}
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package com.gaurav.ExProject.ArrayList;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Predicate;
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/**
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* A java program showing a NullPointerException case
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* for the removeAll() method of the ArrayList class in Java.
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*
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* @author gaurav
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*/
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public class ArrayListRemoveAllNullPointerException {
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public static void main(String[] args) {
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// create an empty arraylist object 'states'
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List<String> states = new ArrayList<String>();
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// add state in the arraylist, Florida multiple times
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states.add("California");
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states.add("Texas");
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states.add("Montana");
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states.add("Arizona");
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states.add("Florida");
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states.add("Michigan");
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states.add("New Jersey");
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states.add("Washington");
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states.add("Ohio");
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states.add("Minnesota");
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states.add("Colorado");
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states.add("Missouri");
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states.add("Nevada");
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// create another ArrayList with null value,
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//so that removeAll will throw NullPointerException
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List<String> statesToBeRemoved =null;
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System.out.println("The states list before the removeAll() method call: \n" + states);
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// removes all elements specified in the ArrayList statesToBeRemoved
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states.removeAll(statesToBeRemoved);
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System.out.println("\nThe states list after the removeAll() method call: \n" + states);
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}
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}
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package com.gaurav.ExProject.ArrayList;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Predicate;
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/**
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* A java program showing an example for the removeIf()
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* method of the ArrayList class in Java.
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*
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* @author gaurav
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*/
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public class ArrayListRemoveIfExample {
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public static void main(String[] args) {
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// create an empty arraylist object 'states'
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List<String> states = new ArrayList<String>();
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// add state in the arraylist, Florida multiple times
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states.add("California");
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states.add("Texas");
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states.add("Florida");
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states.add("Florida");
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states.add("New Jersey");
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states.add("Washington");
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states.add("Florida");
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System.out.println("The states list before the removeIf() call: \n" + states);
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// a predicate for the condition
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Predicate p = s -> s.equals("Florida");
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states.removeIf(p); // removes all elements which satisfy the predicate p
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System.out.println("\nThe states list after the removeIf() call: \n" + states);
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}
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}

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