This topic is about 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 capability 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 utilities are added like ‘jdeps’ to figure out dependencies.
- Stream API − New stream API to facilitate pipeline 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;
public class Java8Tester {
public 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
public 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.
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