What is the difference between jdk 6 and jdk 7

For example if you are parsing a large XML file, substring is very efficient in JDK6 because the data is not moved, just split up into fields that refrence the original file. In JDK6 the old char array is still referenced by the new String.

So only the old String object would be be garbage collected. Not the old char array. Imagine a situation where memory is very critical, once x is changed to hold, smaller array, i do not want to hold up memory and can garbage collect it.

It will reduce memory leaks. The memory leak problem caused by substring in JDK 6 is solved in JDK 7, because new string will not point to the existing old character array.

Thanks a lot for your comment. The old string with old char array will be garbage collected if there is no other references pointing to it. As you said in the above article, In JDK 7 the substring method creates new object, so what will have happen to old string this will retain in memory? What substring does? But its not being used in substring method. Then how is it fixed? Note: order of parameters has overloaded the method. Dont get confused! Sarawgi K.

Stephen Boesch. This new behavior in jdk7 is a significant backwards step. Chintan Mohan Rohila. Add a comment. Active Oldest Votes. To quote debian's wiki : There are several virtual packages used in Debian for Java.

Or to be more exact, consider this description from Oracle : Headless mode is a system configuration in which the display device, keyboard, or mouse is lacking. Improve this answer. Mureinik Mureinik k 49 49 gold badges silver badges bronze badges. As reported in this blog Headless is the same version than the latter without the support of keyboard, mouse and display systems.

I tried to compare dependencies of: java The Overflow Blog. Podcast The first ten years of our programming lives. Upcoming Events. Featured on Meta. Now live: A fully responsive profile. Candidate changes in Moderator Election — review your ballot.

Linked Calendar class more utitlity methods Calendar. Modifier class has classModifiers, interfaceModifiers, constructorModifiers, methodModifiers, and fieldModifiers methods and ReflectionOperationException class.

The java. ConcurrentModificationException has new accept a cause and one with accepts a detailed message. ProtocolFamily interface has enum StandardProtocolFamily which implements this interface. The class InetAddress with getLoopbackAddress method.