Java object-oriented design of the calculator, use the factory model, the three major characteristics of object-oriented. Object-oriented study included a small case

calc
....\.classpath
....\.project
....\bin
....\...\calc.class
....\...\Operation.class
....\...\OperationAdd.class
....\...\OperationDiv.class
....\...\OperationFactory.class
....\...\OperationMul.class
....\...\OperationSub.class
....\src
....\...\calc.java
....\...\Operation.java
....\...\OperationAdd.java
....\...\OperationDiv.java
....\...\OperationFactory.java
....\...\OperationMul.java
....\...\OperationSub.java

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