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Adding linebreak in xml file before root node

I am trying to add line break after my comments above the root node in XML document. I need something like this: But What I was able to get is this(Line break inside the root but I need line break after the comment): I need to add the line break just after my comment. Is there a way to do

Using Java.io.Console.writer() Method in multiple threads

I am getting unexpected behavior when using console.writer() in multiple threads. In the below example, when program starts, I spawn a second thread, which is supposed to print to the console “Simulating Error.” every second. Then the main thread is supposed to print to the console when you type s…

How to draw a SimpleWeightedGraph on a JPanel?

I have a SimpleWeightedGraph and I want to draw it on a JPanel in a JFrame. Unfortunately nothing is drawn. I read this article. They are using a ListenableDirectedGraph so I tried a ListenableUndirectedGraph with no success. Answer It looks that you’re leaving some important details out of your questio…

TimerTask class has to run only once in java

I have a class that runs for every 10 secs, but when I execute it more than once, multiple timers are started. If one timer is already running, I want the other timer calls to be ignored. I want only one timer to be running at a given point of time. Please help. My code: Answer I want the 1st

Regular expression – allow space and any number of digits

my valid string should be either “1234” or ” 1234″ allow one or zero space at the beginning then followed by any number of digits only so what should be the regular expression for this ? Answer You can use this: which is easier to read like this: See demo. To test if you have a match, …