Supplier Functional Interface

Sometimes our requirement is we have to get some value based on some operation like Supply Student object

Supply Random Name
Supply Random OTP
Supply Random Password etc

For this type of requirements we should go for Supplier. Supplier can be used to supply items (objects). Supplier won’t take any input and it will always supply objects. Supplier Functional Interface contains only one method get().

interface Supplier<R> { 
   public R get(); 
}

Supplier Functional interface does not contain any default and static methods.

Supplier to generate Random Name

package com.ashok.java8.supplier;

import java.util.function.Supplier;

/**
 * 
 * @author ashok.mariyala
 *
 */
public class SupplierTest {
   public static void main(String[] args) {
      Supplier<String> s = () -> {
         String[] str = { "Ashok", "Vinod", "Ajay", "Akshara", "Kumari" };
         int x = (int) (Math.random() * 5);
         return str[x];
      };
      System.out.println(s.get());
      System.out.println(s.get());
      System.out.println(s.get());
      System.out.println(s.get());
   }
}

Output

Kumari
Akshara
Vinod
Kumari

Supplier to supply 6-digit Random OTP

package com.ashok.java8.supplier;

import java.util.function.Supplier;

/**
 * 
 * @author ashok.mariyala
 *
 */
public class RandomOTP {
   public static void main(String[] args) {
      Supplier<String> otps = () -> {
         String otp = "";
         for (int i = 1; i <= 6; i++) {
            otp = otp + (int) (Math.random() * 10);
         }
         return otp;
      };
      System.out.println(otps.get());
      System.out.println(otps.get());
      System.out.println(otps.get());
      System.out.println(otps.get());
   }
}

Output

Comparison Table of Predicate, Function, Consumer and Supplier

Supplier Functional Interface