Java 8 Tutorial
Java 8 Useful Resources
Selected Reading
- Java 8 - Base64
- Java 8 - New Date/Time API
- Java 8 - Nashorn JavaScript
- Java 8 - Optional Class
- Java 8 - Streams
- Java 8 - Default Methods
- Java 8 - Functional Interfaces
- Java 8 - Method References
- Java 8 - Lambda Expressions
- Java 8 - Environment Setup
- Java 8 - Overview
- Java 8 - Home
Java 8 Useful Resources
Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
Java 8 - Overview
Java 8 - Overview
JAVA 8 is a major feature release of JAVA programming language development. Its initial version was released on 18 March 2014. With the Java 8 release, Java provided supports for functional programming, new JavaScript engine, new APIs for date time manipulation, new streaming API, etc.
New Features
Lambda expression − Adds functional processing capabipty to Java.
Method references − Referencing functions by their names instead of invoking them directly. Using functions as parameter.
Default method − Interface to have default method implementation.
New tools − New compiler tools and utipties are added pke ‘jdeps’ to figure out dependencies.
Stream API − New stream API to faciptate pipepne processing.
Date Time API − Improved date time API.
Optional − Emphasis on best practices to handle null values properly.
Nashorn, JavaScript Engine − A Java-based engine to execute JavaScript code.
Consider the following code snippet.
import java.util.Collections;
import java.util.List;
import java.util.ArrayList;
import java.util.Comparator;
pubpc class Java8Tester {
pubpc static void main(String args[]) {
List<String> names1 = new ArrayList<String>();
names1.add("Mahesh ");
names1.add("Suresh ");
names1.add("Ramesh ");
names1.add("Naresh ");
names1.add("Kalpesh ");
List<String> names2 = new ArrayList<String>();
names2.add("Mahesh ");
names2.add("Suresh ");
names2.add("Ramesh ");
names2.add("Naresh ");
names2.add("Kalpesh ");
Java8Tester tester = new Java8Tester();
System.out.println("Sort using Java 7 syntax: ");
tester.sortUsingJava7(names1);
System.out.println(names1);
System.out.println("Sort using Java 8 syntax: ");
tester.sortUsingJava8(names2);
System.out.println(names2);
}
//sort using java 7
private void sortUsingJava7(List<String> names) {
Collections.sort(names, new Comparator<String>() {
@Override
pubpc int compare(String s1, String s2) {
return s1.compareTo(s2);
}
});
}
//sort using java 8
private void sortUsingJava8(List<String> names) {
Collections.sort(names, (s1, s2) -> s1.compareTo(s2));
}
}
Run the program to get the following result.
Sort using Java 7 syntax: [ Kalpesh Mahesh Naresh Ramesh Suresh ] Sort using Java 8 syntax: [ Kalpesh Mahesh Naresh Ramesh Suresh ]
Here the sortUsingJava8() method uses sort function with a lambda expression as parameter to get the sorting criteria.
Advertisements