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sonukgsonukg
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lambda expression programs added
1 parent 7cbe1af commit 3a50116

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Lines changed: 295 additions & 3 deletions

‎.idea/kotlinc.xml‎

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‎.idea/libraries/KotlinJavaRuntime.xml‎

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‎.idea/misc.xml‎

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‎Java8.iml‎

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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="library" name="KotlinJavaRuntime" level="project" />
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</component>
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</module>

‎src/lambda/DifferentWaysOfListIterateProg.java‎

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package lambda;
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import java.util.Arrays;
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import java.util.List;
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public class DifferentWaysOfListIterateProg {
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public static void main(String...args) {
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List< String > courses = Arrays.asList("C", "C++", "Core Java", "J2EE", "Spring", "Hibernate", "Python");
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// JDK 8 streaming example lambda expression
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courses.stream().forEach(course -> printCourse(course));
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// JDK 8 streaming example method reference
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courses.stream().forEach(DifferentWaysOfListIterateProg::printCourse);
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// JDK 8 for each with lambda
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courses.forEach(course -> printCourse(course));
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// JDK 8 for each
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courses.forEach(DifferentWaysOfListIterateProg::printCourse);
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}
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// common method to print course
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private static void printCourse(String course) {
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System.out.println("course name :: " + course);
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}
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}

‎src/lambda/DifferentWaysOfMapIterateProg.java‎

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package lambda;
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import java.util.HashMap;
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import java.util.Map;
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public class DifferentWaysOfMapIterateProg {
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public static void main(String...args) {
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Map< Integer, String > coursesMap = new HashMap< Integer, String >();
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coursesMap.put(1, "C");
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coursesMap.put(2, "C++");
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coursesMap.put(3, "Java");
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coursesMap.put(4, "J2EE");
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coursesMap.put(5, "Python");
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coursesMap.put(6, "Scala");
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// JDK 8 for each with lambda
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coursesMap.forEach((k, v) -> coursePrinter(k, v));
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// JDK 8 for each method reference
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coursesMap.forEach(DifferentWaysOfMapIterateProg::coursePrinter);
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}
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// common method to print map key value
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private static void coursePrinter(Integer number, String brand) {
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System.out.println("course no : " + number + " and course name : " + brand);
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}
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}

‎src/lambda/DifferentWaysOfSetIterateProg.java‎

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package lambda;
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import java.util.HashSet;
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import java.util.Set;
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public class DifferentWaysOfSetIterateProg {
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public static void main(String...args) {
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Set< String > courses = new HashSet< String >();
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courses.add("Java");
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courses.add("C");
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courses.add("C++");
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courses.add("Python");
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courses.add("Scala");
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// JDK 8 streaming example lambda expression
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courses.stream().forEach(course -> coursePrinter(course));
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// JDK 8 streaming example method reference
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courses.stream().forEach(DifferentWaysOfSetIterateProg::coursePrinter);
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// JDK 8 for each with lambda
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courses.forEach(course -> coursePrinter(course));
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// JDK 8 for each
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courses.forEach(DifferentWaysOfSetIterateProg::coursePrinter);
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}
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// common method to print course
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private static void coursePrinter(String course) {
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System.out.println("course name :: " + course);
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}
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}

‎src/lambda/LEComparator.java‎

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package lambda;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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public class LEComparator {
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public static void main(String[] args) {
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List<Person> personList = new ArrayList<>();
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personList.add(new Person("John", 20));
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personList.add(new Person("Mary", 25));
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personList.add(new Person("Peter", 30));
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personList.add(new Person("Anna", 28));
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personList.add(new Person("Paul", 35));
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//without lambda expression
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//sort by age
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Comparator<Person> comparator =new Comparator<Person>() {
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@Override
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public int compare(Person o1, Person o2) {
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return o1.getAge() - o2.getAge();
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}
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};
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Collections.sort(personList, comparator);
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System.out.println("Sort Person List by age in ascending order:");
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for (Person person : personList) {
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System.out.println(person.getName() + " " + person.getAge());
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}
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//with lambda expression
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Collections.sort(personList, (o1, o2) -> o1.getAge() - o2.getAge());
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System.out.println("Sort Person List by age in ascending order:");
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personList.forEach(
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(person -> System.out.println(person.getName() + " " + person.getAge()))
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);
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}
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}
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class Person{
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String name;
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int age;
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public Person(String name, int age) {
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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}

‎src/lambda/LambdaWithMultipleParameter.java‎

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package lambda;
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public class LambdaWithMultipleParameter {
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public static void main(String[] args){
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// Multiple parameters in lambda expression
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Addable withLambda = (a, b) -> (a + b);
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System.out.println(withLambda.add(10,20));
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// Multiple parameters with data type in lambda expression
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Addable withLambdaMultiLine = (int a, int b) -> {
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return (a + b);
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};
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System.out.println(withLambdaMultiLine.add(100,200));
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}
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}
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interface Addable{
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public int add(int a, int b);
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}
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‎src/lambda/LambdaWithMultipleStatements.java‎

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package lambda;
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public class LambdaWithMultipleStatements {
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public static void main(String[] args){
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Average withLambda = (withLambdaArray) ->{
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double sum = 0;
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int arraySize= withLambdaArray.length;
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System.out.println("arraySize: " +arraySize);
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for (int i=0; i< withLambdaArray.length; i++){
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sum=sum+withLambdaArray[i];
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}
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System.out.println("sum: " +sum);
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return sum/arraySize;
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};
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int[] withLambdArray ={10,20,30,40};
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System.out.println(withLambda.average(withLambdArray));
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}
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}
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interface Average{
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double average(int[] array);
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}

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