java - What is the difference between openjdk-7-jre-headless and openjdk-7-jre(jdk)? -


when type java -version in command prompt in ubuntu following output 

the program 'java' can found in following packages:  * default-jre  * gcj-4.8-jre-headless  * openjdk-7-jre-headless  * gcj-4.6-jre-headless  * openjdk-6-jre-headless try: apt-get install <selected package>

i above output not have java install. want know difference between openjdk-7-jre-headless , openjdk-7-jre

to quote debian's wiki:

there several virtual packages used in debian java. these cover runtime compatibility , come in 2 flavours; headless (omits graphical interfaces) , normal.

or more exact, consider this description oracle:

headless mode system configuration in display device, keyboard, or mouse lacking. sounds unexpected, can perform different operations in mode, graphic data.


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