A.0.0f
B.numll
C.false
D.0
E.0.0
第1题
classGuy{Stringgreet(){returnhi}}classCowboyextendsGuy{Stringgreet(){returnhowdy”}}classSurferextendsGuy{Stringgreet(){returndudel”}}classGreetings{publicstaticvoidmain(string[]args){Guy[]guy={newGuy(),newCowboy(),newSurfer()};for(Guy0:guys)System.out.print(g.green());}}结果为:
A.运行时异常被输出
B.第7行出现一个错误,编译失败
C.第8行出现一个错误,编译失败
D.hihihi
E.hihawdydoude
第2题
1.classSuperFo{2.SuperFodoStuff(intx){3.returnnewSuperFo()4.}5.}6.7.classFooextendsSuperFo{8.//insertcodehere9.}和四个声明:FoodoStuff(intx){returnnewFoo();}FoodoStuff(intx){returnnewSuperFoo();}SuperFoodoStuff(intx){returnnewfoo();}SuperFoodoStuff(inty){returnnewSuperFoo();}分别插入到第8行,有几个可以通过编译()
A.1
B.2
C.3
D.4
E.5
第4题
A.5
B.编译失败
C.运行时异常被抛出
D.3
E.4
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