Java 笔试题(1)答案.docx

班级:_______________学号:______________姓名:___________Java笔试题(可多选)(ABD)Astart()   Brun()   Cexit()   DgetPriority()   BSerialable   (false)Stringstr1="hello";Stringstr2="he"+newString("llo");==str2);4. 下列说法正确的有(C),>,<,>=,<=,==运算?(true):(B)publicstaticvoidmain(Stringargs[]){Threadt=newThread(){publicvoidrun(){pong();}};();"ping");}staticvoidpong(){"pong");}Apingpong    Bpongping   Cpingpong和pongping都有可能   (AB)  BMySql  CIMS  (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)Afloat  Bdouble  CFloat   (A )A  BufferedWriter B  FileInputStream  C  ObjectInputStream  (CD)Aprivate  Bprotected   Cfinal   (A)A是  =newArrayList(20);中的list扩充几次(A)A0  B1  C2   (AB)ADES BAES CDSA ,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’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}catch(ex){"FileNotFoundException!");}catch(ex){"IOException!");}c