What's going on?Now Java se6 has reached the stage of RC?Sun can't have such a mistake ~ ~

after I carefully checked Javadoc, It is found that there is a passage:

in it http://download.java.net/jdk6/docs/api/java/io/Console.html

"Whetheravirtualmachinehasaconsoleisdependentupontheunderlyingplatformandalsouponthemannerinwhichthevirtualmachineisinvoked.Ifthevirtualmachineisstartedfromaninteractivecommandlinewithoutredirectingthestandardinputandoutputstreamsthenitscons olewillexistandwilltypicallybeconnectedtothekeyboardanddisplayfromwhichthevirtualmachinewaslaunched.Ifthevirtualmachineisstartedautomatically,forexamplebyabackgroundjobscheduler,thenitwilltypicallynothaveaconsole.""> http://download.java.net/jdk6/docs/api/java/io/Con... "

Translation:

whether a virtual machine has a console depends on the platform it depends on and the way the virtual machine resolves the method. If the virtual machine is started from an interactive command line without redirecting the standard input and output streams, the virtual machine automatically connects to the keyboard as the standard input and takes the place where the virtual machine is started as the standard output. If the virtual machine is started automatically, for example, through a task plan in the background, then the typical situation is that there is no console

so think about where we run the above program & amp; mdash;& amp; mdash; Eclipse and other integrated development environments, which is not suitable for the above description of taking the place where the virtual machine is started as the standard output. The console () here returns null by default, so the above error message is generated（ Maybe eclipse will improve in the future)

how to solve this problem?Here are two ideas for you (it has been actually operated and can realize the normal operation of the function)