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Update #3

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11 changes: 11 additions & 0 deletions Collections/.project
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Expand Up @@ -14,4 +14,15 @@
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</projectDescription>
90 changes: 55 additions & 35 deletions Collections/src/com/cdac/collections/collectionsutils/CollectionsDemo.java
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Expand Up @@ -9,7 +9,6 @@
import java.util.Set;

public class CollectionsDemo {

public static void main(String[] args) {
ArrayList<String> list = new ArrayList<>();
list.add("One");
Expand Down Expand Up @@ -51,14 +50,14 @@ public static void main(String[] args) {
String min = Collections.min(list);
System.out.println("Min Element in the List : "+min);

List<Integer> iList = new ArrayList<>();
iList.add(10);
iList.add(20);
iList.add(40);
iList.add(30);
List<Integer> indexList = new ArrayList<>(); //iList name is not understadable can be converted to List 2 or IndexList
indexList.add(10);
indexList.add(20);
indexList.add(40);
indexList.add(30);

//Binary Search in List Collection
int index = Collections.binarySearch(iList, 190);
int index = Collections.binarySearch(indexList, 190);
System.out.println("Binary Search of 190 index is : "+index);

//Copy one list to another list
Expand All @@ -71,36 +70,57 @@ public static void main(String[] args) {
newList.add(14);
newList.add(15);
//newList should have minimum size as iList
Collections.copy(newList, iList);
Collections.copy(newList, indexList);
System.out.println("Copying the list from another list : "+newList);

//Creating Immutable Collection
Set<String> emptySet = Collections.emptySet();
List<String> emptyList = Collections.emptyList();
Map<String, String> emptyMap = Collections.emptyMap();
System.out.println("Creating immutable collection (list, set, map)");
System.out.println("Empty Set : "+emptySet.size());
//emptySet.add("Try"); //not allowed its immutable

//replacing all the elements with the new value
Collections.replaceAll(iList, 10, 100);
System.out.println("Replacing all the 10 in the list with 100 :");
System.out.println(iList);

//shuffling the list
Collections.shuffle(iList);
System.out.println("Shuffle the Elements in the List : ");
System.out.println(iList);
methodCalling(indexList); //Calling all methods from one place

//Creating singleton Collection Set, List, Map
Set<String> singletonSet = Collections.singleton("Java");
System.out.println("Creating singleton Collection : ");
System.out.println(singletonSet);
// singletonSet.add("Hello"); //not supported its immutable
}

static void methodCalling(List<Integer> indexList)
{
immutableCollection(); // Extracted Method
replaceAndShuffle(indexList); // Extracted Method
singletonCollection(); // Extracted Method
synchronizedCollection(); // Extracted Method
}
static void immutableCollection()
{
//Creating Immutable Collection
Set<String> emptySet = Collections.emptySet();
List<String> emptyList = Collections.emptyList();
Map<String, String> emptyMap = Collections.emptyMap();
System.out.println("Creating immutable collection (list, set, map)");
System.out.println("Empty Set : "+emptySet.size());
//emptySet.add("Try"); //not allowed its immutable
}

static void replaceAndShuffle(List<Integer> indexList)
{
//replacing all the elements with the new value
Collections.replaceAll(indexList, 10, 100);
System.out.println("Replacing all the 10 in the list with 100 :");
System.out.println(indexList);

//shuffling the list
Collections.shuffle(indexList);
System.out.println("Shuffle the Elements in the List : ");
System.out.println(indexList);
}

static void singletonCollection()
{
//Creating singleton Collection Set, List, Map
Set<String> singletonSet = Collections.singleton("Java");
//singletonSet.add("Hello"); //not supported its immutable
System.out.println("Creating singleton Collection : ");
System.out.println(singletonSet);
}

//Creating synchronized Collection List, Set, Map
Map<Integer, String> map = new HashMap<>();
map = Collections.synchronizedMap(map);
System.out.println("Creating synchronizing Collection : ");
static void synchronizedCollection()
{
//Creating synchronized Collection List, Set, Map
Map<Integer, String> map = new HashMap<>();
map = Collections.synchronizedMap(map);
System.out.println("Creating synchronizing Collection : ");
}
}
12 changes: 6 additions & 6 deletions Collections/src/com/cdac/collections/list/LinkedListDemo.java
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Expand Up @@ -22,9 +22,9 @@ public static void main(String[] args) {
osList.addLast("WebOS");

//GET ELEMENT
String firstElt = osList.getFirst();
String lastElt = osList.getLast();
String eltAtZero = osList.get(0);
String FirstElement = osList.getFirst();
String LastElement = osList.getLast();
String elementAtZero = osList.get(0);

//GET ELEMENTS USING PEEK AND POLL
//PEEK MEANS RETRIEVES THE ELEMENTS BUT DOES NOT REMOVE THE ELEMENT
Expand Down Expand Up @@ -54,13 +54,13 @@ public static void main(String[] args) {
}

//Removes first Element
String elt = osList.remove();
String Element = osList.remove();

//Removes element at given index
elt = osList.remove(2);
Element = osList.remove(2);

//Removes First Element
elt = osList.removeFirst();
Element = osList.removeFirst();

//Removes Last Element
osList.removeLast();
Expand Down
11 changes: 11 additions & 0 deletions EncryptionDecryption/.project
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<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
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1 change: 0 additions & 1 deletion EncryptionDecryption/bin/.gitignore
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Binary file modified EncryptionDecryption/bin/com/cdac/encrypt/aes/AESEncryption.class
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Binary file added EncryptionDecryption/bin/com/cdac/encrypt/aes/encryptdecrypt.class
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Binary file added EncryptionDecryption/bin/snippet/Snippet.class
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26 changes: 17 additions & 9 deletions EncryptionDecryption/src/com/cdac/encrypt/aes/AESEncryption.java
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Expand Up @@ -14,25 +14,33 @@
*/
public class AESEncryption {

public static void main(String[] args) {
final String strToEncrypt = "My text to encrypt";
public static void main(String[] args)
{
final String strToEncrypt = "My text to encrypt";
final String strPssword = "f2fc2007-b24b-4ab5-b62f-8dba873d0341";
AESEncryption.setKey(strPssword);
AESEncryption.encrypt(strToEncrypt.trim());
encryptdecrypt.setKey(strPssword);
//encryptdecrypt is called from main funcation
encryptdecrypt.encrypt(strToEncrypt.trim());
System.out.println("String to Encrypt: " + strToEncrypt);
System.out.println("Encrypted: " + AESEncryption.getEncryptedString());
final String strToDecrypt = AESEncryption.getEncryptedString();
AESEncryption.decrypt(strToDecrypt.trim());
System.out.println("Encrypted: " + encryptdecrypt.getEncryptedString());
final String strToDecrypt = encryptdecrypt.getEncryptedString();
encryptdecrypt.decrypt(strToDecrypt.trim());
System.out.println("String To Decrypt : " + strToDecrypt);
System.out.println("Decrypted : " + AESEncryption.getDecryptedString());
System.out.println("Decrypted : " + encryptdecrypt.getDecryptedString());
}
}

//class encryptdecrypt increases the readability of the code. So, it is extracted to another new class.
//funcationality remains the same besides having refactoring
class encryptdecrypt
{
private static SecretKeySpec secretKey;
private static byte[] key;
private static String decryptedString;
private static String encryptedString;

public static void setKey(String myKey) {
public static void setKey(String myKey)
{
MessageDigest sha = null;
try {
key = myKey.getBytes("UTF-8");
Expand Down
2 changes: 1 addition & 1 deletion EncryptionDecryption/src/snippet/Snippet.java
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@@ -1,6 +1,6 @@
package snippet;

public class Snippet {
Divisors are
//Divisors are
}

11 changes: 11 additions & 0 deletions ExceptionHandling/.project
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11 changes: 11 additions & 0 deletions FileIO/.project
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11 changes: 11 additions & 0 deletions Generics/.project
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11 changes: 11 additions & 0 deletions InterviewPrograms/.project
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11 changes: 11 additions & 0 deletions JavaEnums/.project
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11 changes: 11 additions & 0 deletions Networking/.project
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11 changes: 11 additions & 0 deletions Reflections/.project
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11 changes: 11 additions & 0 deletions Threads/.project
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