The latest articles on DEV Community by Ranjan Pandey (@ranjan715). https://dev.to/ranjan715 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F693216%2F1164359f-4cb6-45c1-ac52-a89f47bcd344.png https://dev.to/ranjan715 en Ranjan Pandey Wed, 25 Aug 2021 13:22:02 +0000 https://dev.to/ranjan715/java-8-features-implementation-5hi5 https://dev.to/ranjan715/java-8-features-implementation-5hi5 <h2> Features in Java-8 </h2> <ol> <li>Interface Enhancement</li> <li>Functional Interface</li> <li>Lambda Expression</li> <li>Stream API</li> <li>Date &amp; Time API</li> </ol> <p>a. Introduction of default methods - Supports backward compatibility<br> 1. default method is available inside the implementing class<br> 2. there can be more than 1 default method in interface<br> 3. default method helps in bringing backward compatibility</p> <p>b. Introduction of static method<br> 1. static method is not available inside the implementing class<br> 2. there can be more than 1 static method in interface<br> 3. static method helps in bringing backward compatibility<br> 4. we cannot override static method<br> 5. Java 8 onwards main method can be part of interface</p> <p>c. Functional Interface</p> <ol> <li>An interface having one and only one abstract method is a functional</li> <li>Runnable interface had only 1 abstract method called run() - ex. functional interface</li> <li>Comparable interface had only 1 abstract method called compareTo() - ex. functional interface</li> <li>Functional interface can have any number of default and static method but only 1 abstract method thats why it is also called as SAM interface</li> </ol> <p>d. Lambda expression</p> <ul> <li>OOP -&gt; Programming paradigm should adhere to Classes, Objects, Encapsulation, Inheritance, Polymorphirm, Abstraction</li> <li>Functional programming - Here implementation of same functionality can be done in clear and concise manner. <ul> <li>Code will be less, implementation will compact</li> </ul> </li> </ul> <p>e. Predicates</p> <ul> <li>Are predefined functional interfaces</li> <li>Return boolean value</li> </ul> <p>f. Double colon operator =&gt; can be used as an alternative to Lambda expression</p> <ul> <li>method reference - instance and static method</li> <li>constructor reference</li> </ul> <p>g. Streams - java.util.stream</p> <ul> <li>Helps to operate on collection object</li> <li>distinct function removed duplicate and returns unique list</li> <li>skip functions skips the specified number of elements from starting</li> <li>peek function helps in debugging to see what is happening after a particular operation on the stream</li> </ul> <p>h. Java-8: Date Time API</p> <ul> <li>In java 7 we had Date, Calender, Timestamp, they were not efficient, it was present in java.util package</li> <li>In Java 8 a new Date Time API was introduced which is also called as Joda Time Api in a new package called java.time</li> </ul> <p>If you want to implement all Java8 concepts in practical handson based approach than checkout my popular udemy course:</p> <p><a href="https://www.udemy.com/course/practical-java-8-mastery-course/?couponCode=1DCCF8309E7BB06E4C42">https://www.udemy.com/course/practical-java-8-mastery-course/?couponCode=1DCCF8309E7BB06E4C42</a></p> java