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Lambda Expressions best Practices Example

August 11, 2018August 11, 2018 Faiz Akram

Lambda Expressions best Practices Example

//============================================== Convert Class into Map using Java 8 =========================================
//List to Map with Key Mapper and Value Mapper
List<String> list = new ArrayList<>();
list.add("Faiz");
list.add("Akram");
list.add("Ankur");
Map<String, Object> map = list.stream().collect(Collectors.toMap(Function.identity(), s->s));
map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));
//Output
/*Key: Faiz, value: Faiz
  Key: Akram, value: Akram
  Key: Ankur, value: Ankur */

//ist to Map with Key Mapper, Value Mapper on Class
List<Person> list = new ArrayList<>();
list.add(new Person(100, "Faiz"));
list.add(new Person(200, "Akram"));
list.add(new Person(300, "Ankur"));
Map<Integer, String> map = list.stream().collect(Collectors.toMap(Person::getId, Person::getName));
map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));
//Output
/*
  Key: 100, value: Faiz
  Key: 200, value: Akram
  Key: 300, value: Ankur */

//List to Map with Key Mapper, Value Mapper and Merge Function

List<Person> list = new ArrayList<>();
list.add(new Person(100, "Faiz"));
list.add(new Person(100, "Akram"));
list.add(new Person(300, "Ankur"));
Map<Integer, String> map = list.stream().collect(Collectors.toMap(Person::getId, Person::getName, (x, y) -> x+", "+ y));
map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));
//Output
/*Key: 100, value: Faiz, Akram
  Key: 300, value: Ankur */

// List to Map with Key Mapper, Value Mapper, Merge Function and Map Supplier
List<Person> list = new ArrayList<>();
list.add(new Person(100, "Faiz"));
list.add(new Person(100, "Akram"));
list.add(new Person(300, "Ankur"));
LinkedHashMap<Integer, String> map = list.stream().collect(Collectors.toMap(Person::getId, Person::getName, (x, y) -> x+", "+ y, LinkedHashMap::new));
map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));
//Output
/*Key: 100, value: Faiz, Akram
  Key: 300, value: Ankur */

//============================================== Get Index or object list in to Map<key, value>============================================
 List<Integer> numbers = Arrays.asList(10, 2, 3, 4, 5, 6);
 numbers.sort(Comparator.reverseOrder());
 Map<Object, Object> map = numbers.stream().collect(Collectors.toMap(i -> i, i -> numbers.indexOf(i)));
//===============================================Group By Example ===============================================
Map<String, Integer> sum = list.stream().collect(
                Collectors.groupingBy(User::getName, Collectors.summingInt(User::getAge))); // Sum of age output {Vijay=25, Dinesh=68, Kamal=15}
Map<String, Double> sum = list.stream().collect(
                Collectors.groupingBy(User::getName, Collectors.averagingInt(User::getAge))); // Average output {Vijay=25.0, Dinesh=22.666666666666668, Kamal=15.0}
Map<String, Long> sum = list.stream().collect(
                Collectors.groupingBy(User::getName, Collectors.counting())); // Count output {Vijay=1, Dinesh=3, Kamal=1}
//================================ Simple Sorting ===================================================
Collections.sort(emp, new CompartorExmaple().reversed()); // For reverse soring listing
emp.sort(Comparator.comparing(Employee:: getCity)); 
emp.sort(Comparator.comparing(Employee:: getCity).thenComparing(Employee::getName));
//===============================================String Date sorting =========================================

List<String> date = Arrays.asList("2015-11-09", "2015-11-11", "2015-11-08", "2015-11-08");
List<LocalDate> convetedSortedDate = date.stream().map(LocalDate::parse).sorted().collect(Collectors.toList());

//================================================ Sort a List of Strings Alphabetically ==============================
List<String> cities = Arrays.asList("Milan", "london", "San Francisco", "Tokyo", "New Delhi");
System.out.println(cities);
//[Milan, london, San Francisco, Tokyo, New Delhi]
cities.sort(String.CASE_INSENSITIVE_ORDER);
System.out.println(cities);
//[london, Milan, New Delhi, San Francisco, Tokyo]
cities.sort(Comparator.naturalOrder());
System.out.println(cities);
//[Milan, New Delhi, San Francisco, Tokyo, london]

//================================================== Sort a List of Integers ==========================================

List<Integer> numbers = Arrays.asList(6, 2, 1, 4, 9);
System.out.println(numbers); //[6, 2, 1, 4, 9]
numbers.sort(Comparator.naturalOrder());
System.out.println(numbers); //[1, 2, 4, 6, 9]

//========================================== Sort a List by Double Field ============================================

List<Movie> movies = Arrays.asList(
        new Movie("Lord of the rings", 8.8),
        new Movie("Back to the future", 8.5),
        new Movie("Carlito's way", 7.9),
        new Movie("Pulp fiction", 8.9));
movies.sort(Comparator.comparingDouble(Movie::getRating)
                      .reversed());
movies.forEach(System.out::println);


//========================= For remove inside the list ==========================================
List<Employee> emp = new ArrayList<Employee>();
emp.add(new Employee(1,"Faiz","Delhi"));
emp.add(new Employee(2,"Tanu","Noida"));
emp.add(new Employee(3,"Faiz","Delhi"));
emp.removeIf(employee -> employee.getCity().equals("Delhi"));
 
//===================================== Simple iterator using java 8 ====================================
emp.forEach(emp1 ->System.out.println(emp1)); 
emp.forEach(System.out::println);

//================================ Count with filter using java 8 =========================
List<String> numbers = Arrays.asList("10", "2", "3", "4", "5", "6");
Integer count1 = (int) numbers.stream().map(m -> Integer.valueOf(m)).filter(f -> f > 4 ).count();
Integer count2 = (int) numbers.stream().map(m -> Integer.valueOf(m)).filter(f -> f > 4 && f < 6).count();

//======================================= Filter Java 8 =============================

List<String> lines = Arrays.asList("spring", "node", "faiz"); //String list
List<String> result = str.stream().filter(str -> !"faiz".equals(str)).collect(Collectors.toList()); 

long sum = emp.stream().filter(e->e.getId() >= 1 && e.getId() < 3).mapToLong(u -> u.getSalary()).sum();
System.out.println(sum);

int num = list.stream().filter(u -> u.getName().endsWith("sh")).mapToInt(u -> u.getSalary()).sum();
System.out.println(num);

List<Integer> list  = Arrays.asList(3, 12, 23, 44, 20, 10, 17, 8);
System.out.println("---List with even Numbers---");
List<Integer> evenList = list.stream().filter(i -> i%2 == 0).collect(Collectors.toList());
evenList.forEach(s -> System.out.print(s+" "));
System.out.println("\n---List with odd Numbers---");
List<Integer> oddList = list.stream().filter(i -> i%2 == 1).collect(Collectors.toList());
oddList.forEach(System.out::println);

//====================================== Filter Name in List of User object ===============================
String[] name= {"Faiz", "Akram"};
List<User> present = Arrays.asList(name).stream().flatMap(x -> list .stream().filter(y -> x.equalsIgnoreCase(y.getName())))
		        .collect(Collectors.toList());

//========Map Example =====================
Map<String, Integer> items = new HashMap<>();
	items.put("A", 10);
	items.put("B", 20);
	items.put("C", 30);
	items.put("D", 40);
	items.put("E", 50);
	items.put("F", 60);
	items.forEach((k,v)->System.out.println("Item : " + k + " Count : " + v));
  items.forEach((k,v)->{
		System.out.println("Item : " + k + " Count : " + v);
		if("E".equals(k)){
			System.out.println("Hello E");
		}
	});

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//============================================== Convert Class into Map using Java 8 =========================================

//List to Map with Key Mapper and Value Mapper

List<String> list = new ArrayList<>();

list.add("Faiz");

list.add("Akram");

list.add("Ankur");

Map<String, Object> map = list.stream().collect(Collectors.toMap(Function.identity(), s->s));

map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));

//Output

/*Key: Faiz, value: Faiz

Key: Akram, value: Akram

Key: Ankur, value: Ankur */

//ist to Map with Key Mapper, Value Mapper on Class

List<Person> list = new ArrayList<>();

list.add(new Person(100, "Faiz"));

list.add(new Person(200, "Akram"));

list.add(new Person(300, "Ankur"));

Map<Integer, String> map = list.stream().collect(Collectors.toMap(Person::getId, Person::getName));

map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));

//Output

Key: 100, value: Faiz

Key: 200, value: Akram

Key: 300, value: Ankur */

//List to Map with Key Mapper, Value Mapper and Merge Function

List<Person> list = new ArrayList<>();

list.add(new Person(100, "Faiz"));

list.add(new Person(100, "Akram"));

list.add(new Person(300, "Ankur"));

Map<Integer, String> map = list.stream().collect(Collectors.toMap(Person::getId, Person::getName, (x, y) -> x+", "+ y));

map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));

//Output

/*Key: 100, value: Faiz, Akram

Key: 300, value: Ankur */

// List to Map with Key Mapper, Value Mapper, Merge Function and Map Supplier

List<Person> list = new ArrayList<>();

list.add(new Person(100, "Faiz"));

list.add(new Person(100, "Akram"));

list.add(new Person(300, "Ankur"));

LinkedHashMap<Integer, String> map = list.stream().collect(Collectors.toMap(Person::getId, Person::getName, (x, y) -> x+", "+ y, LinkedHashMap::new));

map.forEach((x, y) -> System.out.println("Key: " + x +", value: "+ y));

//Output

/*Key: 100, value: Faiz, Akram

Key: 300, value: Ankur */

//============================================== Get Index or object list in to Map<key, value>============================================

List<Integer> numbers = Arrays.asList(10, 2, 3, 4, 5, 6);

numbers.sort(Comparator.reverseOrder());

Map<Object, Object> map = numbers.stream().collect(Collectors.toMap(i -> i, i -> numbers.indexOf(i)));

//===============================================Group By Example ===============================================

Map<String, Integer> sum = list.stream().collect(

Collectors.groupingBy(User::getName, Collectors.summingInt(User::getAge))); // Sum of age output {Vijay=25, Dinesh=68, Kamal=15}

Map<String, Double> sum = list.stream().collect(

Collectors.groupingBy(User::getName, Collectors.averagingInt(User::getAge))); // Average output {Vijay=25.0, Dinesh=22.666666666666668, Kamal=15.0}

Map<String, Long> sum = list.stream().collect(

Collectors.groupingBy(User::getName, Collectors.counting())); // Count output {Vijay=1, Dinesh=3, Kamal=1}

//================================ Simple Sorting ===================================================

Collections.sort(emp, new CompartorExmaple().reversed()); // For reverse soring listing

emp.sort(Comparator.comparing(Employee:: getCity));

emp.sort(Comparator.comparing(Employee:: getCity).thenComparing(Employee::getName));

//===============================================String Date sorting =========================================

List<String> date = Arrays.asList("2015-11-09", "2015-11-11", "2015-11-08", "2015-11-08");

List<LocalDate> convetedSortedDate = date.stream().map(LocalDate::parse).sorted().collect(Collectors.toList());

//================================================ Sort a List of Strings Alphabetically ==============================

List<String> cities = Arrays.asList("Milan", "london", "San Francisco", "Tokyo", "New Delhi");

System.out.println(cities);

//[Milan, london, San Francisco, Tokyo, New Delhi]

cities.sort(String.CASE_INSENSITIVE_ORDER);

System.out.println(cities);

//[london, Milan, New Delhi, San Francisco, Tokyo]

cities.sort(Comparator.naturalOrder());

System.out.println(cities);

//[Milan, New Delhi, San Francisco, Tokyo, london]

//================================================== Sort a List of Integers ==========================================

List<Integer> numbers = Arrays.asList(6, 2, 1, 4, 9);

System.out.println(numbers); //[6, 2, 1, 4, 9]

numbers.sort(Comparator.naturalOrder());

System.out.println(numbers); //[1, 2, 4, 6, 9]

//========================================== Sort a List by Double Field ============================================

List<Movie> movies = Arrays.asList(

new Movie("Lord of the rings", 8.8),

new Movie("Back to the future", 8.5),

new Movie("Carlito's way", 7.9),

new Movie("Pulp fiction", 8.9));

movies.sort(Comparator.comparingDouble(Movie::getRating)

.reversed());

movies.forEach(System.out::println);

//========================= For remove inside the list ==========================================

List<Employee> emp = new ArrayList<Employee>();

emp.add(new Employee(1,"Faiz","Delhi"));

emp.add(new Employee(2,"Tanu","Noida"));

emp.add(new Employee(3,"Faiz","Delhi"));

emp.removeIf(employee -> employee.getCity().equals("Delhi"));

//===================================== Simple iterator using java 8 ====================================

emp.forEach(emp1 ->System.out.println(emp1));

emp.forEach(System.out::println);

//================================ Count with filter using java 8 =========================

List<String> numbers = Arrays.asList("10", "2", "3", "4", "5", "6");

Integer count1 = (int) numbers.stream().map(m -> Integer.valueOf(m)).filter(f -> f > 4 ).count();

Integer count2 = (int) numbers.stream().map(m -> Integer.valueOf(m)).filter(f -> f > 4 && f < 6).count();

//======================================= Filter Java 8 =============================

List<String> lines = Arrays.asList("spring", "node", "faiz"); //String list

List<String> result = str.stream().filter(str -> !"faiz".equals(str)).collect(Collectors.toList());

long sum = emp.stream().filter(e->e.getId() >= 1 && e.getId() < 3).mapToLong(u -> u.getSalary()).sum();

System.out.println(sum);

int num = list.stream().filter(u -> u.getName().endsWith("sh")).mapToInt(u -> u.getSalary()).sum();

System.out.println(num);

List<Integer> list = Arrays.asList(3, 12, 23, 44, 20, 10, 17, 8);

System.out.println("---List with even Numbers---");

List<Integer> evenList = list.stream().filter(i -> i%2 == 0).collect(Collectors.toList());

evenList.forEach(s -> System.out.print(s+" "));

System.out.println("\n---List with odd Numbers---");

List<Integer> oddList = list.stream().filter(i -> i%2 == 1).collect(Collectors.toList());

oddList.forEach(System.out::println);

//====================================== Filter Name in List of User object ===============================

String[] name= {"Faiz", "Akram"};

List<User> present = Arrays.asList(name).stream().flatMap(x -> list .stream().filter(y -> x.equalsIgnoreCase(y.getName())))

.collect(Collectors.toList());

//========Map Example =====================

Map<String, Integer> items = new HashMap<>();

items.put("A", 10);

items.put("B", 20);

items.put("C", 30);

items.put("D", 40);

items.put("E", 50);

items.put("F", 60);

items.forEach((k,v)->System.out.println("Item : " + k + " Count : " + v));

items.forEach((k,v)->{

System.out.println("Item : " + k + " Count : " + v);

if("E".equals(k)){

System.out.println("Hello E");

}

});

Permutation of String in Java Algorithm

May 30, 2018May 30, 2018 Faiz Akram

       public static Set<String> strset = new HashSet<String>();
        public static void permutation(String str) { 
		Set<String> strSet = permutation("", str); 
		for(String st:strSet)
			System.out.println(st);
	}
	private static Set<String> permutation(String prefix, String str) {
	    int n = str.length();
	    if (n == 0) 
	    	strset.add(prefix);
	    else {
	        for (int i = 0; i < n; i++)
	            permutation(prefix + str.charAt(i), str.substring(0, i) + str.substring(i+1, n));
	    }
	    return strset;
	}

public static Set<String> strset = new HashSet<String>();

public static void permutation(String str) {

Set<String> strSet = permutation("", str);

for(String st:strSet)

System.out.println(st);

}

private static Set<String> permutation(String prefix, String str) {

int n = str.length();

if (n == 0)

strset.add(prefix);

else {

for (int i = 0; i < n; i++)

permutation(prefix + str.charAt(i), str.substring(0, i) + str.substring(i+1, n));

}

return strset;

}

Covert String to byte array

May 29, 2018May 29, 2018 Faiz Akram

We can use String class getBytes() method to encode the string into a sequence of bytes using the platform’s default charset. This method is overloaded and we can also pass Charset as argument.
Here is a simple program showing how to convert String to byte array in java.

       public static void main(String[] args) {
		String str = "Faiz";
		byte[] byteArr = name.getBytes();
		System.out.println(Arrays.toString(byteArr));
	}
//output
//[70, 97, 105, 122]

public static void main(String[] args) {

String str = "Faiz";

byte[] byteArr = name.getBytes();

System.out.println(Arrays.toString(byteArr));

}

//output

//[70, 97, 105, 122]

Ignore case while find query using Mongodb.

March 14, 2018 Faiz Akram

public List<Student> readByRhid(String emailId) {
        Query query = new Query();
        Criteria criteria = Criteria.where(LabelConstant.STUDENT_DETAIL + "." + LabelConstant.EMAILID).regex("^"+emailId+"$", "i");
        query.addCriteria(criteria);
        return mongoTemplate.find(query, Student.class);
}

public List<Student> readByRhid(String emailId) {

Query query = new Query();

Criteria criteria = Criteria.where(LabelConstant.STUDENT_DETAIL + "." + LabelConstant.EMAILID).regex("^"+emailId+"$", "i");

query.addCriteria(criteria);

return mongoTemplate.find(query, Student.class);

}

Use This Criteria

Criteria criteria = Criteria.where(LabelConstant.STUDENT_DETAIL + "." + LabelConstant.EMAILID).regex("^"+emailId+"$", "i");

1	Criteria criteria = Criteria.where(LabelConstant.STUDENT_DETAIL + "." + LabelConstant.EMAILID).regex("^"+emailId+"$", "i");

How to add CORS with Spring?

March 7, 2018March 7, 2018 Faiz Akram

1st Example For All Location

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
 
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**");
    }
}

@Configuration

@EnableWebMvc

public class WebConfig extends WebMvcConfigurerAdapter {

@Override

public void addCorsMappings(CorsRegistry registry) {

registry.addMapping("/**");

}

2nd Example For Validate which location and which method to allow

@Configuration
@EnableWebMvc
public class AppConfig extends WebMvcConfigurerAdapter {
	@Override
	public void addCorsMappings(CorsRegistry registry) {
	  registry.addMapping("/**")
	   	  .allowedOrigins("http://localhost:8585", "http://localhost:8787")
		  .allowedMethods("POST", "GET",  "PUT", "OPTIONS", "DELETE")
		  .allowedHeaders("X-Auth-Token", "Content-Type")
		  .exposedHeaders("custom-header1", "custom-header2")
		  .allowCredentials(false)
		  .maxAge(4800);
	}
}

@Configuration

@EnableWebMvc

public class AppConfig extends WebMvcConfigurerAdapter {

@Override

public void addCorsMappings(CorsRegistry registry) {

registry.addMapping("/**")

.allowedOrigins("http://localhost:8585", "http://localhost:8787")

.allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")

.allowedHeaders("X-Auth-Token", "Content-Type")

.exposedHeaders("custom-header1", "custom-header2")

.allowCredentials(false)

.maxAge(4800);

}

How To Register Multiple Interceptor In Spring MVC?

March 7, 2018 Faiz Akram

Create Configuration Class extends with WebMvcConfigurerAdapter

 @Override
   public void addInterceptors(InterceptorRegistry registry) {
      // Register guest interceptor with single path pattern
      registry.addInterceptor(new GuestInterceptor()).addPathPatterns("/guest");

      // Register admin interceptor with multiple path patterns
      registry.addInterceptor(new AdminInterceptor())
              .addPathPatterns(new String[] { "/admin", "/admin/*" });
   }

@Override

public void addInterceptors(InterceptorRegistry registry) {

// Register guest interceptor with single path pattern

registry.addInterceptor(new GuestInterceptor()).addPathPatterns("/guest");

// Register admin interceptor with multiple path patterns

registry.addInterceptor(new AdminInterceptor())

.addPathPatterns(new String[] { "/admin", "/admin/*" });

}

Log4j Multiple Appender Simple Example in java

February 23, 2018 Faiz Akram

# Root logger option

log4j.rootLogger=INFO, DEBUG, file,console
# Console Appender

log4j.appender.console=org.apache.log4j.ConsoleAppender

log4j.appender.console.Append=true

log4j.appender.console.layout=org.apache.log4j.PatternLayout

log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-ddHH:mm:ss,SSS} %-5p [ %M ]  ( %C )  %c{1}:%L - %m%n
# File Appender

log4j.appender.file=org.apache.log4j.FileAppender

log4j.appender.file.DatePattern='.'yyyy-MM-dd-HH-mm

log4j.appender.file.Append=true

log4j.appender.file.layout=org.apache.log4j.PatternLayout

log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-ddHH:mm:ss,SSS} %-5p [ %M ]  ( %C )  %c{1}:%L - %m%n

log4j.appender.file.File=C:/log/SpringMain.log

log4j.appender.file.MaxBackupIndex=10

Provide time zone to Spring @Scheduled or XML?

December 19, 2017December 19, 2017 Faiz Akram

//Annotation Based
@Scheduled(cron = "0 10 19 * * FRI", zone = "CET")

//XML Based
<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
	<property name="jobDetail" ref="schedulerJob" />
	<property name="cronExpression" value="0 10 9 ? * * " />
	<property name="timeZone" value="UTC"/>
  </bean>

//Annotation Based

@Scheduled(cron = "0 10 19 * * FRI", zone = "CET")

//XML Based

</bean>

Preferred Java way to ping an HTTP URL for availability

December 6, 2017 Faiz Akram

/**
	 * 
	 * @param url
	 * @return
	 */
	public Boolean validateURL(String url) {
		try {
		    final URLConnection connection = new URL(url).openConnection();
		    connection.connect();
		    return true;
		} catch (final MalformedURLException e) {
		    throw new IllegalStateException("Bad URL: " + url, e);
		} catch (final IOException e) {
		    return false;
		}
		
	}

/**

* @param url

* @return

public Boolean validateURL(String url) {

try {

final URLConnection connection = new URL(url).openConnection();

connection.connect();

return true;

} catch (final MalformedURLException e) {

throw new IllegalStateException("Bad URL: " + url, e);

} catch (final IOException e) {

return false;

}

Convert Date/Time for given Timezone – java

November 16, 2017November 16, 2017 Faiz Akram

        public static Date convertDateToAnotherTimeZone(Date inputDate, String inputTimezoneCode,
			String targetTimezoneCode) {

		TimeZone fromTimezone = TimeZone.getTimeZone(inputTimezoneCode);// get Timezone object
		TimeZone toTimezone = TimeZone.getTimeZone(targetTimezoneCode);

		long fromOffset = fromTimezone.getOffset(inputDate.getTime());// get offset
		long toOffset = toTimezone.getOffset(inputDate.getTime());

		// calculate offset difference and calculate the actual time
		long convertedTime = inputDate.getTime() - (fromOffset - toOffset);
		Date newDate = new Date(convertedTime);
		DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		df.format(newDate);

		return newDate;
	}

public static Date convertDateToAnotherTimeZone(Date inputDate, String inputTimezoneCode,

String targetTimezoneCode) {

TimeZone fromTimezone = TimeZone.getTimeZone(inputTimezoneCode);// get Timezone object

TimeZone toTimezone = TimeZone.getTimeZone(targetTimezoneCode);

long fromOffset = fromTimezone.getOffset(inputDate.getTime());// get offset

long toOffset = toTimezone.getOffset(inputDate.getTime());

// calculate offset difference and calculate the actual time

long convertedTime = inputDate.getTime() - (fromOffset - toOffset);

Date newDate = new Date(convertedTime);

DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

df.format(newDate);

return newDate;

}