calculator\.classpath ..........\.project ..........\bin\test\Calculate.class ..........\...\....\Calculator.class ..........\...\....\TestCalculator.class ..........\...\....\Tool.class ..........\src\test\Calculate.java ..........\...\....\Calculator.java ..........\...\....\TestCalculator.java ..........\...\....\Tool.java ..........\bin\test ..........\src\test ..........\bin ..........\src calculator