Java笔试题含答案.docx

文档介绍：班级:_______________学号:______________姓名:___________Java笔试题(可多选)(ABD)Astart()Brun()Cexit()DgetPriority()(A)(false)Stringstr1="hello";Stringstr2="he"+newString("llo");(str1==str2);(C),>,<,>=,<=,==运算?(true):(B)publicstaticvoidmain(Stringargs[]){Threadt=newThread(){publicvoidrun(){pong();}};();("ping");}staticvoidpong(){("pong");}(AB)(垃圾回收器)线程是否为守护线程?(true)?(false)(AC)+1<i的数吗?(存在)(B)(A)(CD)(A)=newArrayList(20);中的list扩充几次(A)(AB),下面哪个选项的代码是错误的?(B)A)newBufferedWriter(newFileWriter(""));B)newBufferedReader(newFileInputStream(""));C)newGZIPOutputStream(newFileOutputStream(""));D)newObjectInputStream(newFileInputStream(""));(yes)lassNULL{publicstaticvoidhaha(){("haha");}publicstaticvoidmain(String[]args){((NULL)null).haha();}}()classHelloA{publicHelloA(){("HelloA");}{("I'mAclass");}static{("staticA");}}lassHelloBextendsHelloA{publicHelloB(){("HelloB");}{("I'mBclass");}static{("staticB");}publicstaticvoidmain(String[]args){newHelloB();}}StaticAStaticBHelloAI’mAclassHelpBI’()方法如下,try中可以捕获三种类型的异常,如果在该方法运行中产生了一个IOException