java to learn a new knowledge, can not be expected only看一本or two books will be able to fully grasp. The need for a step-by-step process of reading. I recommend Oreilly s Java series of books published

Calculator
..........\.classpath
..........\.project
..........\bin
..........\...\MyPackage
..........\...\.........\calculator.class
..........\src
..........\...\MyPackage
..........\...\.........\calculator.java

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