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Commit e469ebd

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collection Examples
1 parent c93e38c commit e469ebd

16 files changed

+402
-0
lines changed

‎collection/List/ArrayAsList.java‎

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package collection.List;
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import java.util.Arrays;
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import java.util.List;
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public class ArrayAsList {
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public static void main(String[] args) {
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String[] strs = {"JAVA", "Python", "GoLang","PHP"};
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System.out.println(Arrays.toString(strs));
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List<String> list = Arrays.asList(strs);
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System.out.println(list);
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List<Integer> IntList = Arrays.asList(22, 44, 11, 33);
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System.out.println(IntList);
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}
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}
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package collection.List;
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import java.util.ArrayList;
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import java.util.Iterator;
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public class ArrayListExample {
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public static void main(String[] args) {
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ArrayList<Integer> list= new ArrayList<>();
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list.add(10);
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list.add(8);
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list.add(17);
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list.add(14);
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System.out.println("Element at index 2: "+list.get(2));
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Iterator<Integer> itr=list.iterator();
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while(itr.hasNext())
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System.out.println(itr.next());
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System.out.println("Removed Element: "+list.remove(2));
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System.out.println("New Element at index 2: "+list.get(2));
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System.out.println(list.parallelStream());
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System.out.println(list.iterator());
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list.set(2,15);
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System.out.println("Postion 2 Element Changed to "+list.get(2));
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}
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}
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package collection.List;
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import java.util.LinkedList;
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import java.util.ListIterator;
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public class LinkedListExample {
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public static void main(String[] args) {
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LinkedList<Integer> list= new LinkedList<>();
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list.add(10);
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list.add(8);
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list.add(17);
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list.add(14);
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System.out.println("Element at index 2: "+list.get(2));
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ListIterator<Integer> itr=list.listIterator();
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while(itr.hasNext())
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System.out.println(itr.next());
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System.out.println("Removed Element: "+list.remove(2));
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System.out.println("New Element at index 2: "+list.get(2));
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System.out.println(list.parallelStream());
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System.out.println(list.iterator());
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list.set(2,15);
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System.out.println("Postion 2 Element Changed to "+list.get(2));
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}
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}

‎collection/List/ListToArray.java‎

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package collection.List;
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import java.util.ArrayList;
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public class ListToArray {
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public static void main(String[] args) {
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ArrayList<Integer> list= new ArrayList<>();
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list.add(10);
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list.add(8);
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list.add(17);
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list.add(14);
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Integer[] arr=list.toArray(new Integer[0]);
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for(Integer a:arr) {
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System.out.println(a.toString());
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}
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}
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}

‎collection/List/VectorExample.java‎

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package collection.List;
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import java.util.Iterator;
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import java.util.Vector;
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public class VectorExample {
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public static void main(String[] args) {
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Vector<String> list= new Vector<>();
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list.add("Java");
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list.add("C");
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list.add("C++");
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list.add("HTML");
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System.out.println("Element at index 2: "+list.get(2));
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Iterator<String> itr=list.iterator();
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while(itr.hasNext())
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System.out.println(itr.next());
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System.out.println("Removed Element: "+list.remove(2));
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System.out.println("New Element at index 2: "+list.get(2));
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System.out.println(list.parallelStream());
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System.out.println(list.iterator());
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list.set(2,"JavaScript");
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System.out.println("Postion 2 Element Changed to "+list.get(2));
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}
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}

‎collection/Map/HashMapExample.java‎

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package collection.Map;
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import java.util.HashMap;
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import java.util.Map;
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/*
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* Output-
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Value Associated with key 'two'= 2
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Keysets: [six, one, seven, two]
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Entry of map: [six=6, one=1, seven=7, two=2]
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Size of map: 4
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one : 1
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{six=6, one=1, seven=7, two=2}
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*
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*/
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public class HashMapExample {
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public static void main(String[] args) {
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Map<String,Integer> m=new HashMap<>();
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m.put("six", 6);
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m.put("one", 1);
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m.put("two", 2);
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m.put("seven", 7);
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System.out.print("Value Associated with key 'two'= "+m.get("two")+"\n");
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System.out.print("Keysets: "+m.keySet()+"\n");
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System.out.print("Entry of map: "+m.entrySet()+"\n");
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System.out.println("Size of map: "+m.size());
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if(m.containsKey("one")) {
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Integer x=m.get("one");
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System.out.println("one : "+x);
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}
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if(!m.isEmpty())
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System.out.println(m);
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}
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}
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package collection.Map;
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import java.util.LinkedHashMap;
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import java.util.Map;
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public class LinekedHAshMapExample {
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public static void main(String[] args) {
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Map<String,Integer> m=new LinkedHashMap<>();
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m.put("six", 6);
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m.put("one", 1);
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m.put("two", 2);
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m.put("seven", 7);
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System.out.print("Value Associated with key 'two'= "+m.get("two")+"\n");
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System.out.print("Keysets: "+m.keySet()+"\n");
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System.out.print("Entry of map: "+m.entrySet()+"\n");
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System.out.println("Size of map: "+m.size());
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if(m.containsKey("one")) {
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Integer x=m.get("one");
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System.out.println("one : "+x);
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}
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if(!m.isEmpty())
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System.out.println(m);
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}
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}

‎collection/Map/TreeMapExample.java‎

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package collection.Map;
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import java.util.Map;
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import java.util.TreeMap;
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/*
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Value Associated with key 'two'= 2
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Keysets: [one, seven, six, two]
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Entry of map: [one=1, seven=7, six=6, two=2]
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Size of map: 4
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one : 1
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{one=1, seven=7, six=6, two=2}
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*/
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public class TreeMapExample {
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public static void main(String[] args) {
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Map<String,Integer> m=new TreeMap<>();
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//Treemap sorts according to key
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m.put("six", 6);
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m.put("one", 1);
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m.put("two", 2);
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m.put("seven", 7);
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System.out.print("Value Associated with key 'two'= "+m.get("two")+"\n");
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System.out.print("Keysets: "+m.keySet()+"\n");
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System.out.print("Entry of map: "+m.entrySet()+"\n");
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System.out.println("Size of map: "+m.size());
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if(m.containsKey("one")) {
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Integer x=m.get("one");
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System.out.println("one : "+x);
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}
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if(!m.isEmpty())
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System.out.println(m);
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}
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}
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package collection.Queue;
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import java.util.Iterator;
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import java.util.PriorityQueue;
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import java.util.Queue;
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/*
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C
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JavaScript
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Java
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Python
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*/
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public class PriorityQueueExample {
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public static void main(String[] args) {
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Queue<String> list= new PriorityQueue<>();
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list.add("Java");
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list.add("Python");
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list.add("C");
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list.add("JavaScript");
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Iterator<String> itr=list.iterator();
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while(itr.hasNext())
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System.out.println(itr.next());
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System.out.println("Removed Element: "+list.remove("C"));
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}
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}

‎collection/Queue/QueueExample.java‎

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package collection.Queue;
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import java.util.ArrayDeque;
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import java.util.Iterator;
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import java.util.Queue;
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/* Java
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Python
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C
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JavaScript
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*/
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public class QueueExample {
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public static void main(String[] args) {
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Queue<String> list= new ArrayDeque<>();
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list.add("Java");
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list.add("Python");
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list.add("C");
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list.add("JavaScript");
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Iterator<String> itr=list.iterator();
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while(itr.hasNext())
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System.out.println(itr.next());
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System.out.println("Removed Element: "+list.remove("C"));
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}
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}

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