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divScorpdivScorp
authoredSep 3, 2017
collection Examples
1 parent c93e38c commit e469ebd

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lines changed
 

Diff for: ‎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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}

Diff for: ‎collection/List/ArrayListExample.java

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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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}

Diff for: ‎collection/List/LinkedListExample.java

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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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}

Diff for: ‎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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}

Diff for: ‎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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}

Diff for: ‎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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}

Diff for: ‎collection/Map/LinekedHAshMapExample.java

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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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}

Diff for: ‎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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}

Diff for: ‎collection/Queue/PriorityQueueExample.java

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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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}

Diff for: ‎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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}

Diff for: ‎collection/Set/Book.java

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package collection.Set;
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public class Book {
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private int price;
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private String title;
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public Book(int p,String t) {
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price=p;
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title=t;
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}
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public String getTitle() {
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return title;
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}
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public int getPrice() {
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return price;
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}
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@Override
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public int hashCode() {
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return price/100;
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}
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@Override
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public boolean equals(Object arg) {
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if(!(arg instanceof Book))
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return false;
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Book b=(Book)arg;
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return title.equals(b.title) && price==b.price;
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}
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@Override
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public String toString() {
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return "[Title: "+title+", Price: "+price+"]";
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}
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}

Diff for: ‎collection/Set/BookNameComparator.java

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package collection.Set;
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import java.util.Comparator;
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public class BookNameComparator implements Comparator<Book> {
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@Override
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public int compare(Book o1, Book o2) {
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return o1.getTitle().compareTo(o2.getTitle());
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}
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}

Diff for: ‎collection/Set/BookPriceComparator.java

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package collection.Set;
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import java.util.Comparator;
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public class BookPriceComparator implements Comparator<Book> {
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@Override
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public int compare(Book o1, Book o2) {
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return (o1.getPrice()<o2.getPrice())?-1:(o1.getPrice()>o2.getPrice())?1:0;
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}
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}

Diff for: ‎collection/Set/HashSetExample.java

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package collection.Set;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Set;
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/* Output-
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*
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* Java
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C
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JavaScript
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Python
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*
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* */
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public class HashSetExample {
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public static void main(String[] args) {
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Set<String> list= new HashSet<>();
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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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System.out.println(list.parallelStream());
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}
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}

Diff for: ‎collection/Set/LinkedHashSetEx.java

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package collection.Set;
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/*
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* Output-
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*
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* Java
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Python
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C
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JavaScript
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Removed Element: true
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*
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* */
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import java.util.Iterator;
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import java.util.LinkedHashSet;
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import java.util.Set;
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public class LinkedHashSetEx {
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public static void main(String[] args) {
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Set<String> list= new LinkedHashSet<>();
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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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}

Diff for: ‎collection/Set/TreeSetExample.java

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package collection.Set;
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import java.util.Iterator;
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import java.util.Set;
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import java.util.TreeSet;
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/* Output-
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C
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Java
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JavaScript
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Python
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*/
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public class TreeSetExample {
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public static void main(String[] args) {
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Set<String> list= new TreeSet<>();
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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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