1) write a commodity class goods, which has two private data members: unit price and quantity number, and use the construction method to initialize the data members, and use cost () to calculate the total cost; 2) in the main function, call cost () to calculate the cost of Ma yunyun.

Filename	Size	Update
JAVA6	0	2019-10-09
JAVA6\.classpath	301	2019-10-09
JAVA6\.project	381	2019-10-09
JAVA6\.settings	0	2019-10-09
JAVA6\.settings\org.eclipse.jdt.core.prefs	598	2019-10-09
JAVA6\bin	0	2019-10-09
JAVA6\bin\exam.class	1850	2019-11-04
JAVA6\bin\people.class	1768	2019-11-04
JAVA6\src	0	2019-10-09
JAVA6\src\exam.java	1695	2019-10-09

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