定义
Double d1=1.0 d2=2.0;
d1==d2 为false
double d1=1.0 d2=2.0;
d1==d2 为true
Double d1=1.0 ;double d2=2.0;
d1==d2 为true
定义
Double d1=1.0 d2=2.0;
d1==d2 为false
double d1=1.0 d2=2.0;
d1==d2 为true
Double d1=1.0 ;double d2=2.0;
d1==d2 为true
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