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Refactored #4

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Refactored #4

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0d8e9c4
Refactored Code
Mar 22, 2022
380d541
Refactored Code
Mar 22, 2022
ce5f417
Refactored Code 2
Mar 22, 2022
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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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<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
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<filter>
<id>1647954731126</id>
<name></name>
<type>30</type>
<matcher>
<id>org.eclipse.core.resources.regexFilterMatcher</id>
<arguments>node_modules|.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
</matcher>
</filter>
</filteredResources>
</projectDescription>
94 changes: 59 additions & 35 deletions Collections/src/com/cdac/collections/collectionsutils/CollectionsDemo.java
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Expand Up @@ -8,8 +8,8 @@
import java.util.Map;
import java.util.Set;

public class CollectionsDemo {
public class CollectionsDemo
{
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<>();
list.add("One");
Expand Down Expand Up @@ -51,14 +51,14 @@ 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 +71,60 @@ 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: 5 additions & 7 deletions Collections/src/com/cdac/collections/threadsafe/EmployeeRunnable.java
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Expand Up @@ -2,17 +2,15 @@

import java.util.ArrayList;

public class EmployeeRunnable implements Runnable{
public class EmployeeRunnable
{

ArrayList<String> names;

public EmployeeRunnable(ArrayList<String> list) {
this.names = list;
}

@Override
public void run() {
for(int i=0;i<100;i++)
names.add("Employee :: "+i);
}
}

}
//run method moved to MainProgram.java
69 changes: 56 additions & 13 deletions Collections/src/com/cdac/collections/threadsafe/MainProgram.java
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@@ -1,22 +1,65 @@
package com.cdac.collections.threadsafe;

import java.util.ArrayList;
// import com.cdac.collections.bean.Student;
// Applying move method run to main program, decreases the complexity of tread running
public class MainProgram implements Runnable
{
public static void main(String[] args) throws CloneNotSupportedException {

import com.cdac.collections.bean.Student;

public class MainProgram {
public static void main(String[] args) throws CloneNotSupportedException {
ArrayList<String> list = new ArrayList<>();
EmployeeRunnable employeeRunnable = new EmployeeRunnable(list);
StudentRunnable studentRunnable = new StudentRunnable(list);

Thread t1 = new Thread(employeeRunnable);
Thread t2 = new Thread(studentRunnable);
Thread t1 = new Thread();
Thread t2 = new Thread();

t1.start();
t2.start();
ArrayList<String> list = new ArrayList<>();
EmployeeRunnable employeeRunnable = new EmployeeRunnable(list);
StudentRunnable studentRunnable = new StudentRunnable(list);



}
public void run()
{
ArrayList<String> Employeenames = null;
ArrayList<String> Studentnames = null;
for(int i=0;i<100;i++)
{
Employeenames.add("Employee :: "+i);
}
for(int j =100; j<200;j++)
{
Studentnames.add("Student :: "+j);
}

}
}

}
// class EmployeeRunnable implements Runnable
// {

// ArrayList<String> names;

// public EmployeeRunnable(ArrayList<String> list) {
// this.names = list;
// }

// @Override
// public void run() {
// for(int i=0;i<100;i++)
// names.add("Employee :: "+i);
// }
// }

// class StudentRunnable implements Runnable
// {

// ArrayList<String> names;

// public StudentRunnable(ArrayList<String> list) {
// this.names = list;
// }
// @Override
// public void run() {
// for(int i=100;i<200;i++)
// names.add("Student :: "+i);
// }

17 changes: 6 additions & 11 deletions Collections/src/com/cdac/collections/threadsafe/StudentRunnable.java
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Expand Up @@ -2,17 +2,12 @@

import java.util.ArrayList;

public class StudentRunnable implements Runnable{

public class StudentRunnable
{
ArrayList<String> names;

public StudentRunnable(ArrayList<String> list) {
public StudentRunnable(ArrayList<String> list)
{
this.names = list;
}
@Override
public void run() {
for(int i=100;i<200;i++)
names.add("Student :: "+i);
}

}
}
//run method moved to MainProgram.java
11 changes: 11 additions & 0 deletions EncryptionDecryption/.project
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<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
<filteredResources>
<filter>
<id>1647954731142</id>
<name></name>
<type>30</type>
<matcher>
<id>org.eclipse.core.resources.regexFilterMatcher</id>
<arguments>node_modules|.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
</matcher>
</filter>
</filteredResources>
</projectDescription>
1 change: 0 additions & 1 deletion EncryptionDecryption/bin/.gitignore
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This file was deleted.

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
6 changes: 4 additions & 2 deletions EncryptionDecryption/src/snippet/Snippet.java
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@@ -1,6 +1,8 @@
package snippet;

public class Snippet {
Divisors are
public class Snippet
{
//Divisors are
}

//changed snippet.java as code is giving error
11 changes: 11 additions & 0 deletions ExceptionHandling/.project
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<nature>org.eclipse.jdt.core.javanature</nature>
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<filteredResources>
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11 changes: 11 additions & 0 deletions FileIO/.project
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<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
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11 changes: 11 additions & 0 deletions Generics/.project
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<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
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