平纳科(上海)信息咨询有限公司

《平纳科(上海)信息咨询有限公司》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、选择题1:1.Give the following method:  2. public void method( ){  3. String a,b;  4. a=new String(“hello world”);  5. b=new String(“game over”);  6. System.out.println(a+b+”ok”);  7. a=null;  8. a=b;  9. System.out.println(a);  10. }   11.In the absence o

2、f compiler optimization, which is the earliest point the object a refered is definitely elibile to be garbage collection.  Givethefollowingmethod:publicvoidmethod(){Stringa,b;a=newString(“helloworld”);b=newString(“gameover”);System.out.println(a+b+”ok

3、”);a=null;a=b;System.out.println(a);}Intheabsenceofcompileroptimization,whichistheearliestpointtheobjectareferedisdefinitelyelibiletobegarbagecollection.A.beforeline5B.beforeline6C.beforeline7D.beforeline92:在软件生命周期中，下列哪个说法是不准确的?A.软件生命周期分为计划、开发和运行三个阶段B

4、.在计划阶段要进行问题焉醛和需求分析C.在开发后期要进行编写代码和软件测试D.在运行阶段主要是进行软件维护3:Whichofthefollowingansweriscorrecttoexpressthevalue8inoctalnumber?A.010B.0x10C.08D.0x84:Usetheoperator“>>”and“>>>”.Whichstatementistrue?A.10100000000000000000000000000000>>4give0000101000000000000

5、0000000000000B.10100000000000000000000000000000>>4give11111010000000000000000000000000C.10100000000000000000000000000000>>>4give00000000000000000000000000000000D.10100000000000000000000000000000>>>4give111110100000000000000000000000005:Whichstatementa

6、boutthegarbagecollectionmechanismaretrue?A.Garbagecollectionrequireadditionalprogramecodeincaseswheremultiplethreadsarerunning.B.Theprogrammercanindicatethatareferencethroughalocalvariableisnolongerofinterest.C.Theprogrammerhasamechanismthatexplicitya

7、ndimmediatelyfreesthememoryusedbyJavaobjects.D.ThegarbagecollectionmechanismcanfreethememoryusedbyJavaObjectatexplectiontime.6:鉴于Java的特点，它最适合的计算环境是A.并行计算环境B.分布式计算环境C.高强度计算环境D.开放式计算环境7:在下述选项时,没有构成死循环的程序是A.inti=100while(1){i=i%100+1;if(i>100)break;}B.fo

8、r(;;);C.intk=1000;do{++k;}while(k>=10000);D.ints=36;while(s);--s;8:1.Give the following java source fragement:  2.//point x  3.public class Interesting{  4.//do something  5.}  6.Which statement is correctly Java syntax at point x?   Givethefo