Practical 5 :- Practical on Lambda Expression

• Code

  /* @author VIKRAM
  *	Write a Java program using Lambda Expression with single parameters.
  */
  
  interface HelloWorld {
  void sayHello();
  }
  public class LambdaExpressionExample { public static void main(String args[]){
  HelloWorld helloworld=()->{System.out.println("Hello World");}; helloworld.sayHello();
  }

• Output

  Hello
  World

• Code

  interface findCube
  {
  int cube(int num);
  }
  public class Practical52 {
  
  /**
  *	@param args the command line arguments
  */
  public static void main(String[] args) {
  // TODO code application logic here findCube cubeobj=(int x)->{return x*x*x;};
   int result=cubeobj.cube(2);
  System.out.println("Cube of Enter number is="+result);
  }
  }

• Output

  Output
  Cube of Enter number is=8

• Code

  *	Write a Java program using Lambda Expression
  *	with multiple parameters to add two numbers.
  */
  interface Calculator
  {
  int add(int x,int y);
  }
  public class Practical53 {
  
  /**
  *	@param args the command line arguments
  */
  public static void main(String[] args) {
  // TODO code application logic here int num1=20,num2=10;
  Calculator calc=(int n1,int n2)->{return num1+num2;};
   int result=calc.add(num1, num2);
  System.out.println("Addition of two number is ="+result);
  }
  }

• Output

  Addition of two number is =30

a. Convert Fahrenheit to Celcius

• code

  @FunctionalInterface
  interface Converter<T, R> {
      R convert(T t);
  }
  
  Converter<Double, Double> fahrenheitToCelsius = f -> (f - 32) * 5 / 9;
  double celsius = fahrenheitToCelsius.convert(100.0);
  System.out.println("Fahrenheit to Celsius: " + celsius);

b.  Convert Kilometers to Miles.

• code

  Converter<Double, Double> kilometersToMiles = k -> k * 0.621371;
  double miles = kilometersToMiles.convert(100.0);
  System.out.println("Kilometers to Miles: " + miles);

Runnable r = () -> System.out.println("Hello World");
r.run(); // Prints: Hello World

• Code

  interface Constr{
  String addstr(String fname,String lname);
  }
  public class Practical56 {
  
  /**
  *	@param args the command line arguments
  */
  public static void main(String[] args) {
  // TODO code application logic here String fname="Hiray";
  String lname="College";
  Constr ctr=(String f,String l)->{return  f+" "+l;}; String fullstring=ctr.addstr(fname,lname); System.out.println("My Full name is "+fullstring);
  }
  
  }

• Output

  My Full name is Hiray College