Method with a NullPointer Exception

Method with a NullPointer Exception

References

Reference NO 1

http://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html

Reference NO 2

http://stackoverflow.com/questions/4712722/calling-method-from-main-throws-nullpointerexception

Reference NO 3

http://stackoverflow.com/questions/15568234/null-pointer-exception-on-calling-interface-method-implemented-in-other-class

Reference NO 4

http://stackoverflow.com/questions/1917384/nullpointer-exception-when-calling-method-from-a-difference-class

Reference NO 5

http://stackoverflow.com/questions/3322638/is-it-okay-to-throw-nullpointerexception-programatically

Reference NO 6

http://www.javacodegeeks.com/2012/06/avoid-null-pointer-exception-in-java.html

Reference NO 7

http://wiki.processing.org/w/Why_do_I_get_a_NullPointerException%3F

Reference NO 8

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