New features in Java 8

New features in Java 8

Java 8 (also known as JDK 1.8) is a major version of Java language development. Oracle Corporation released Java 8 on March 18, 2014, which supports functional programming, new JavaScript engines, new date APIs, new stream APIs, and more.

New features

Java8 has added a lot of features, we mainly discuss the following:

• The Lambda expression −lambda allows the function to be passed as a parameter of a method (function as an argument into the method).

• method Reference − A method reference provides a very useful syntax to directly reference a method or constructor that already has a Java class or object (instance). Used in conjunction with lambda, method references can make language constructs more compact and concise, reducing redundant code.

• default Method − The default method is a method that has an implementation in the interface.

• new Tools − New compiler tools, such as: Nashorn engine JJs, class-dependent parser jdeps.

• Stream API − The newly added stream API (Java.util.stream) introduces a true functional programming style into Java.

• Date Time API − strengthens the processing of dates and times.

• The Optional class −optional class has become part of the Java 8 class library To resolve null pointer exceptions.

• Nashorn, JavaScript engine −java 8 provides a new Nashorn JavaScript engine that allows us to run specific JavaScript applications on the JVM.

More new features can be found on the website: What ' s new in JDK 8

In the case of Java 8 articles, we use the JDK 1.8 environment, and you can view the current JDK version using the following command:

$ java-"1.8.0_31"1.8.0_31-64-bit Server VM (build 25.31-b07, Mixed mode)

Programming style

Java 8 wants its own programming style and differs from Java 7, and the following examples show the programming formats for Java 7 and Java 8:

Java8tester.java File Code:

Importjava.util.Collections;Importjava.util.List;Importjava.util.ArrayList;ImportJava.util.Comparator; Public classJava8tester { Public Static voidMain (String args[]) {List<String> names1 =NewArraylist<string>(); Names1.add ("Google"); Names1.add ("Runoob"); Names1.add ("Taobao"); Names1.add ("Baidu"); Names1.add ("Sina"); List<String> Names2 =NewArraylist<string>(); Names2.add ("Google"); Names2.add ("Runoob"); Names2.add ("Taobao"); Names2.add ("Baidu"); Names2.add ("Sina"); Java8tester Tester=NewJava8tester (); System.out.println ("Using Java 7 Syntax:");      Tester.sortusingjava7 (NAMES1);      System.out.println (NAMES1); System.out.println ("Using Java 8 Syntax:");      Tester.sortusingjava8 (Names2);   System.out.println (Names2); }      //sorting using Java 7   Private voidSortUsingJava7 (list<string>names) {Collections.sort (names,NewComparator<string>() {@Override Public intCompare (string s1, string s2) {returnS1.compareto (S2);   }      }); }      //sorting using Java 8   Private voidSortUsingJava8 (list<string>names) {Collections.sort (names, (S1, S2)-S1.compareto (S2)); }}

Execute the above script and the output is:

78 syntax: [Baidu, Google, Runoob, Sina, Taobao]

Next we'll give you a detailed introduction to the new features of Java 8:

Serial Number	features
1	Lambda expression
2	Method reference
3	Function-Type interface
4	Default method
5	Stream
6	Optional class
7	Nashorn, JavaScript engine
8	New Date-Time API
9	Base64

New features in Java 8