Difference between revisions of "JAVA"
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== Java 7 == | == Java 7 == | ||
| − | == Java 8 == | + | == [[Java 8]] == |
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| + | There are dozens of features added to Java 8, the most significant ones are mentioned below − | ||
| + | |||
| + | *'''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. | ||
| + | |||
| + | |||
| + | === Java SE 8 Interview Questions and Answers === | ||
| + | *[[Java SE 8 Interview Questions and Answers - 1]] | ||
| + | |||
===[[Lambda Expressions]]=== | ===[[Lambda Expressions]]=== | ||
===[[Collections]]=== | ===[[Collections]]=== | ||
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=== [[Servlets]]=== | === [[Servlets]]=== | ||
=== [[JSP]]=== | === [[JSP]]=== | ||
| + | === [[Java Coding Practises]] === | ||
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| + | ==Java Ubuntu== | ||
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| + | <source> | ||
| + | $ sudo update-alternatives --config java | ||
| + | [sudo] password for rasimsen: | ||
| + | There are 2 choices for the alternative java (providing /usr/bin/java). | ||
| + | |||
| + | Selection Path Priority Status | ||
| + | ------------------------------------------------------------ | ||
| + | * 0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode | ||
| + | 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode | ||
| + | 2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode | ||
| + | |||
| + | Press <enter> to keep the current choice[*], or type selection number: 2 | ||
| + | update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode | ||
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| + | rasimsen@workspace:~/workspace$ java -version | ||
| + | openjdk version "1.8.0_242" | ||
| + | OpenJDK Runtime Environment (build 1.8.0_242-8u242-b08-0ubuntu3~18.04-b08) | ||
| + | OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode) | ||
| + | </source> | ||
| + | |||
| + | https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-ubuntu-18-04 | ||
Latest revision as of 07:29, 26 May 2020
Contents
Java 7
Java 8
There are dozens of features added to Java 8, the most significant ones are mentioned below −
- 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.
Java SE 8 Interview Questions and Answers
Lambda Expressions
Collections
Date and Time
Java 9
Java 10
Java IDE's
Eclipse
NetBeans
IntelliJ IDEA
JBuilder
JDeveloper
MyEclipse
Java Frameworks
Springframework
Springframework - MVC
SpringBoot
Java Toolkit
Java Dependency Management and Build Automation Tools
Apache Ant with Ivy
Apache Maven
Gradle
Java Interview Questions and Answers
General Questions about Java
Java Threads
Java Collections
Garbage Collectors
Exception Handling
JDBC
Remote Method Invocation (RMI)
Servlets
JSP
Java Coding Practises
Java Ubuntu
$ sudo update-alternatives --config java
[sudo] password for rasimsen:
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode
1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode
2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode
rasimsen@workspace:~/workspace$ java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (build 1.8.0_242-8u242-b08-0ubuntu3~18.04-b08)
OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-ubuntu-18-04
