XyzWs Java FAQ

XyzWs Java FAQ

XyzWs Java FAQ

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	What happens if a class doesn't implement all the methods defined in the interface?

	Is PriorityQueue a ordered and sorted collection?

	How does the result differ between the String and number operands of the '+' operator?

	When initialization occurs in an interface?

	How to use class literals?

	Why down casting throws ClassCastException?

	What is the default package?

	Why wait(), notify(), notifyAll() must be called inside a synchronized method/block?

	What is the difference between parseXxx() and valueOf()?

	Why do we have only public static final variables in interfaces?

	Can I use an enum type in Java switch statement?

	What is the substring trap in Java?

	What Should I Know about AutoBoxing and UnBoxing in Java 5.0?

	Are all values of the Java integral types signed number?

	Can we synchronize static method/variable in a Java class?

	How to use the synchronized keyword?

	What can or can not for the Java enum type when you use it?

	How to run external programs from java under window?

	How to get default character set for the Java virtual machine?

	How to use HttpURLConnection POST data to web server?

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