How to check whether java is installed on the computer

Question

I am trying to install java windows application on client machine I want to check whether requried JRE is installed on the machine or not  I want to check it by java program not by cmd command

User · Answer

command prompt   C  Users admin gt java -version  Press Enter gt  java version  1 7 0 25  Java TM  SE Runtime Environment  build 1 7 0 25-b17  Java HotSpot TM  64-Bit Server VM  build 23 25-b01  mixed mode

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Open Command Prompt and type in the following command  java -version  Upon successful execution  the command will output the version of Java along with Java SE Runtime Environment   s build and Java HotSpot Client VM   s build

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Check the installation directories  typically C  Program Files  x86  or C  Program Files  for the java folder  If it contains the JRE you have java installed

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if you are using windows or linux operating system then type in command prompt   terminal  java -version   If java is correctly installed then you will get something like this  java version  1 7 0 25  Java TM  SE Runtime Environment  build 1 7 0 25-b15  Java HotSpot TM  Client VM  build 23 25-b01  mixed mode  sharing    Side note  After installation of Java on a windows operating system  the PATH variable is changed to add java exe so you need to re-open cmd exe to reload the PATH variable   Edit   CD to the path first     cd C  ProgramData Oracle Java javapath java -version

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If java not installed yet  Then program written by java cannot be run to check if java is installed or not

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1 Open the command prompt or terminal based on your OS   2 Then type java --version in the terminal   3  If java is installed successfullly it will show the respective version

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Go to this link and wait for a while to load   http   www java com en download testjava jsp  You will see the below image    You can alternatively open command window and type java -version

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type java -version  in command prompt  it will give you the installed version of java on your system

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Using Apache Commons-Lang s SystemUtils isJavaVersionAtLeast JavaVersion   import org apache commons lang3 JavaVersion  import org apache commons lang3 SystemUtils   if  SystemUtils isJavaVersionAtLeast JavaVersion JAVA 1 8      System out println  Java version was 8 or greater

User · Answer

After installing Java  set the path in environmental variables and then open the command prompt and type java -version  If installed properly  it ll list the java version  jre version  etc   You can additionally check by trying the javac command too  If it displays some data  you ve your java installed with the proper path set  else it ll that javac is an invalid command

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Type in the command window  java -version   If it gives an output everything should be fine  If you want to develop software you might want to set the PATH

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You can do it programmatically by reading the java system properties   Test public void javaVersion         System out println System getProperty  java version         System out println System getProperty  java runtime version         System out println System getProperty  java home         System out println System getProperty  java vendor         System out println System getProperty  java vendor url         System out println System getProperty  java class path         This will output somthing like  1 7 0 17 1 7 0 17-b02 C  workspaces Oracle jdk1 7 jre Oracle Corporation http   java oracle com  C  workspaces Misc Miscellaneous bin        The first line shows the version number  You can parse it an see whether it fits your minimun required java version or not  You can find a description for the naming convention here and more infos here

[java] How to check whether java is installed on the computer

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