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Can answer me what daemon threads are in Java?

Finding Number of Cores in Java

int cores = Runtime.getRuntime().availableProcessors();

If cores is less than one, either your processor is about to die, or your JVM has a serious bug in it, or...

How can I find the number of cores available to my application from within Java code?

Key Differences Between Multitasking and Multi-threading in OS

The basic difference between multitasking and multi-threading is that in multitasking, the system allows executing multiple programs...

Create the unit test class in the same package.

For example,

If com.example.MyPrivateClass located in src/main/java/com/example/MyPrivateClass.java

Then the test class will be in same...

I think the button in some layout that takes care of positioning. If you modify layoutX this means during the next layout pass the Button is simply put back "where it belongs" by the parent layout.
...

What is the difference between pass by value and pass by reference in Java?

I recommend reading the indiabix tutorials for improving your coding skills in all areas of programming. This site is providing some good exercises for beginners. Project Euler is another good site...