A. //This is comment B. /*This is comment C. /**This is comment*/ D. /*This is comment*/
A. 单行注释 B. 多行注释 C. 文档注释 D. 不能嵌套别的注释
A. charc B. floatf=5.1 C. booleanb=false D. doubled=10.0
A. class B. new C. subclass D. interface
A. 2 B. 1 C. 9 D. 10