three-=one;
System.out.println("three -= one ==> "+three);
three 不是30吗
one是10.
three-=one;为什么不是30-10=20呢？
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three/=one;
System.out.println("three /= one ==> "+three);
为什么不是30/10=3而是等于30呢
2016-04-20
System.out.println("three+=one==>"+(three+=one));//three=30+10=40
System.out.println("three-=one==>"+(three-=one));//three=40-10=30
System.out.println("three*=one==>"+(three*=one));//three=30*10=300
System.out.println("three/=one==>"+(three/=one));//three=300/10=30
System.out.println("three%=one==>"+(three%=one));//three=30%10=0
程序从上到下执行，没执行一步，three就被重新赋值
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