#code

Author: basahota

demo/ConsumerDemo.java

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+package com.javatechie.pre.functional.demo;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Consumer;
+
+public class ConsumerDemo {
+
+	public static void main(String[] args) {
+		/*
+		 * Consumer<Integer> consumer = t -> System.out.println("Printing  : " + t);
+		 * 
+		 * consumer.accept(10);
+		 */
+
+		List<Integer> list1 = Arrays.asList(1, 2, 3, 4, 5);
+
+		list1.stream().forEach(t -> System.out.println("print  : " + t));
+
+	}
+}

demo/PredicateDemo.java

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+package com.javatechie.pre.functional.demo;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class PredicateDemo {
+
+	public static void main(String[] args) {
+
+		List<Integer> list1 = Arrays.asList(1, 2, 3, 4, 5);
+
+		list1.stream().filter(t -> t % 2 == 0).forEach(t -> System.out.println("print  Even: " + t));
+	}
+}

demo/SupplierDemo.java

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+package com.javatechie.pre.functional.demo;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Supplier;
+
+public class SupplierDemo {
+
+	public static void main(String[] args) {
+
+
+		List<String> list1 = Arrays.asList();
+
+		System.out.println(list1.stream().findAny().orElseGet(() -> "Hi viewers"));
+	}
+}

example/Book.java

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+package com.javatechie.lambda.example;
+
+public class Book {
+	private int id;
+	private String name;
+	private int pages;
+
+	public int getId() {
+		return id;
+	}
+
+	public void setId(int id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public int getPages() {
+		return pages;
+	}
+
+	public void setPages(int pages) {
+		this.pages = pages;
+	}
+
+	@Override
+	public String toString() {
+		return "Book [id=" + id + ", name=" + name + ", pages=" + pages + "]";
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + id;
+		result = prime * result + ((name == null) ? 0 : name.hashCode());
+		result = prime * result + pages;
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		Book other = (Book) obj;
+		if (id != other.id)
+			return false;
+		if (name == null) {
+			if (other.name != null)
+				return false;
+		} else if (!name.equals(other.name))
+			return false;
+		if (pages != other.pages)
+			return false;
+		return true;
+	}
+
+	public Book() {
+		super();
+		// TODO Auto-generated constructor stub
+	}
+
+	public Book(int id, String name, int pages) {
+		super();
+		this.id = id;
+		this.name = name;
+		this.pages = pages;
+	}
+
+}

example/BookDAO.java

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+package com.javatechie.lambda.example;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BookDAO {
+
+	public List<Book> getBooks() {
+		List<Book> books = new ArrayList<>();
+		books.add(new Book(101, "Core Java", 400));
+		books.add(new Book(363, "Hibernate", 180));
+		books.add(new Book(275, "Spring", 200));
+		books.add(new Book(893, "WebService", 300));
+		return books;
+	}
+}

example/BookService.java

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+package com.javatechie.lambda.example;
+
+import java.util.Collections;
+import java.util.List;
+
+public class BookService {
+
+	/*
+	 * ( o1, o2) -> o2.getName().compareTo(o1.getName());
+	 * 
+	 */
+	public List<Book> getBooksinSort() {
+		List<Book> books = new BookDAO().getBooks();
+		Collections.sort(books, (o1, o2) -> o1.getName().compareTo(o2.getName()));
+		return books;
+	}
+
+	public static void main(String[] args) {
+		System.out.println(new BookService().getBooksinSort());
+	}
+}
+
+/*
+ * class MyComparator implements Comparator<Book> {
+ * 
+ * @Override public int compare(Book o1, Book o2) { return
+ * o2.getName().compareTo(o1.getName()); }
+ */