文档介绍：--------------------------校验:_____________-----------------------日期:_____________Java-笔试题(1)答案班级:_______________学号:______________姓名:___________Java笔试题(可多选)(ABD)Astart()   Brun()   Cexit()   DgetPriority() (A)A继承自Throwable   BSerialable   C该类实现了Throwable接口D该类是一个公共类 (false)Stringstr1="hello";Stringstr2="he"+newString("llo"); 4. 下列说法正确的有(C), >,<,>=,<=,==运算?(true):(B)publicstaticvoidmain(Stringargs[]){Threadt=newThread(){publicvoidrun(){pong();}};n();}staticvoidpong(){}Apingpong    Bpongping   Cpingpong和pongping都有可能   D都不输出 (AB)  BMySql  CIMS  DMongoDB (垃圾回收器)线程是否为守护线程?(true) ?(false)(AC)ALinkedList继承自ListBAbstractSet继承自SetCHashSet继承自AbstractSetDWeakMap继承自HashMap +1<i的数吗?(存在) 的数据类型是(B)Afloat  Bdouble  CFloat   DDouble (A )A  BufferedWriter B  FileInputStream  C  ObjectInputStream  DInputStreamReader (CD)Aprivate  Bprotected   Cfinal   Dabstract (A)A是  B否 =newArrayList(20);中的list扩充几次(A)A0  B1  C2   D3 (AB)ADES BAES CDSA DRSA ,下面哪个选项的代码是错误的?(B)A)B)C)newGZIPOutputStream(newFilD) (yes)lassNULL{publicstaticvoidhaha(){}publicstaticvoidmain(String[]args){((NULL)null).haha();}}()classHelloA{publicHelloA(){}}lassHelloBextendsHelloA{publicHelloB(){}publicstaticvoidmain(String[]args){ newHelloB(); }}StaticAStaticBHelloAI’mAclassHelpBI’mBClass21. getCustomerInfo()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,将会输出什么结果(A)publicvoidgetCustomerInfo(){try{//dosomethingthatmaycauseanException}}A IOException!BIOException!Exception!CFileNotFoundException!IOException!DFileNotFoundException!IOException!Exception! :(C)lassfoo{publicstaticvoidmain(String[]args){Strings;}}A 代码得到编译,并输出“s=”B 代码得到编译,并输出“s=null”C 由于Strings没有初始