第一个值运行结果是40可以理解，为什么第二运行结果是30，不应该运算是20吗？
three+=one;
System.out.println("three+=one==>"+three);
three-=one;
System.out.println("three-=one==>"+three);
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three+=one;
System.out.println("three+=one==>"+three);
three-=one;
System.out.println("three-=one==>"+three);
2017-05-01
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