Lambda1.java

package streams;

import java.util.Comparator;
import java.util.function.Consumer;


public class Lambda1 {

	@SuppressWarnings("unused")
	public static void main(String[] args) {
		
		Comparator<Employee> byName = new Comparator<Employee>() {
			public int compare(Employee a, Employee b) {
				return a.getName().compareTo(b.getName());
			}
		};
		
		
		// Our first lambda expression
		Comparator<Employee> byNameLambda1 = 
			(Employee a, Employee b) -> { return a.getName().compareTo(b.getName()); };
	
			
		// Removing parameter types		
		Comparator<Employee> byNameLambda2 =
			(a, b) -> {	return a.getName().compareTo(b.getName()); };

			
		// Removing braces and 'return'
		Comparator<Employee> byNameLambda3 =
			(a, b) -> a.getName().compareTo(b.getName());
			
			
		// You cannot remove braces and leave 'return'
		// Comparator<Employee> byNameLambda4 =
		// 	(a, b) -> return a.getName().compareTo(b.getName());
		Comparator<Employee> byNameLambda4 =
			(a, b) -> { return a.getName().compareTo(b.getName()); };
			
			
		// Expression with no parameters
		Runnable r = () -> { System.out.println("A compact Runnable!"); };
		Thread t1 = new Thread(r);
		
		
		// No need to even mention Runnable
		Thread t2 = new Thread( () -> { System.out.println("An implicit Runnable!"); } );
		
		
		// No need for braces here
		Thread t3 = new Thread( () -> System.out.println("An implicit Runnable!") );
		
		
		
		// Expression with one parameter
		Consumer<String> lengthPrinter = 
				s -> System.out.println(s.length());
						
	}

	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
}