JAVA系統(tǒng)分析筆試題精選

1、JAVA系統(tǒng)分析筆試題選擇題1:public class xpublic object mobject o = new float;s:/li ne 3object oa = new object1;s:/li ne 4oa0 = o;s:/li ne 5o=nu ll;s:/li ne 6return oa0;s:/li ne 7whe n is the float object, created in line 3,eligible for garbagecollecti on?public class xpublic object mobject o = new float;s:/li

2、ne 3object oa = new object1;s:/li ne 4oa0 = o;s:/li ne 5o=nu ll;s:/li ne 6return oa0;s:/li ne 7whe n is the float object, created in line 3,eligible for garbagecollecti on?after line 5.after line 6after line 7in this method2:use the operator “” and “” . which statement is true?0000 0000 0000 0000 00

3、00 0000 0000 4 give 0000 1010 0000 0000 00000000 0000 00000000 0000 0000 0000 0000 0000 0000 4 give 1111 1010 0000 0000 00000000 0000 00000000 0000 0000 0000 0000 0000 0000 4 give 0000 0000 0000 00000000 0000 0000 00000000 0000 0000 0000 0000 0000 0000 4 give 1111 1010 0000 00000000 0000 0000 00003:

4、the follow ing code is en tire contents of a file called ,causes precisely one error duri ng pilati on:class subclass exte nds baseclassclass baseclassstri ng str;public baseclass;public baseclassstr=s;public class examplepublic void methodsubclass s=new subclass;baseclass b=new baseclass;which line

5、 would be cause the error?the following code is entire contents of a file called ,causes precisely one error duri ng pilati on:class subclass exte nds baseclassclass baseclassstri ng str;public baseclass;public baseclassstr=s;public class examplepublic void methodsubclass s=new subclass;baseclass b=

6、new baseclass;which line would be cause the error?4:what will be the result of executi ng the follow ing code?boolea n a = true;boolea n b = false;boolea n c = true;ififif ;else ;else if );else ;choices:what will be the result of execut ing the follow ing code?boolea n a = true;boolea n b = false;bo

7、olea n c = true;ififif ;else ;else if );else ;choices:code won t pileb. ” some things are true in this world” will be printedc. ” hey this won t pile ” will be printedof these5:give the followi ng java source frageme nt:s:/po int xpublic class in terest ings:/do somethi ngwhich stateme nt is correct

8、ly java syn tax at point x?give the followi ng java source frageme nt:s:/po int xpublic class in terest ings:/do somethi ngwhich stateme nt is correctly java syn tax at point x?class myclasss:/do other thi ng int pi=myclasss:/do some thing 6:public class pare nt int cha nge class child exte nds pare

9、 nt which methods can be added into class child?int cha ngeint cha ngint cha nge7:給出下面的代碼片斷。oo下面的哪些陳述為錯誤的？1) public void create 2) vector myvect;3) myvect = new vector;4) 給出下面的代碼片斷。下面的哪些陳述為錯誤的？1) public void create 2) vector myvect;3) myvect = new vector;4) a. 第二行的聲明不會為變量 myvect分配內(nèi)存空間。b. 第二行語句創(chuàng)建一個ve

10、ctor類對象。c. 第三行語句創(chuàng)建一個vector類對象。followi ngd. 第三行語句為一個vector類對象分配內(nèi)存空間8:what is writte nto the sta ndard output give n thestateme nt:;select the right an swer:9:which fragme nts are n ot correct in java source file?testpackage; public class tests:/do someth in g.*; package testpackage; public class test

11、s:/ do someth in g.*; class pers on s:/ do somethi ng. public class tests:/ do somethi ng.*; import *; public class tests:/ do somethi ng.10:give the follow ing java class:public class examplestatic int x=new in t15;public static void mainJwhich stateme nt is corrected?give the follow ing java class

12、:public class examplestatic int x=new in t15;public static void mainJwhich stateme nt is corrected?pile, some error will occur.run, some error will occur.is zero.is n ull.11:使用jdbc可以做到的是a. 把二進(jìn)制代碼傳送到任何關(guān)系數(shù)據(jù)庫中b. 把java源代碼傳送到任何關(guān)系數(shù)據(jù)庫中c. 把表單信息傳送到任何關(guān)系數(shù)據(jù)庫中d. 很容易地把sql語句傳送到任何關(guān)系數(shù)據(jù)庫中12:which method you defi ne a

13、s the start ing point of new thread in a class from which new the thread can be excuti on?void startvoid runvoid runn ablestatic void mai n13:which stateme nts about java code security are not true?bytecode verifier loads all classes n eeded for the executi on of a program.code is performed by the r

14、un time in terpreter.run time the bytecodes are loaded, checked and run in an in terpreter. class loader adds security by separati ng the n amespaces for the classes of the local file system from those imported from network sources.14:關(guān)于垃圾收集的哪些敘述是對的。a. 程序開發(fā)者必須自己創(chuàng)建一個線程進(jìn)行內(nèi)存釋放的工作。b. 垃圾收集將檢查并釋放不再使用的內(nèi)存。c

15、. 垃圾收集允許程序開發(fā)者明確指定并立即釋放該內(nèi)存。d. 垃圾收集能夠在期望的時間釋放被java對象使用的內(nèi)存。15:give the follow ing java class:public class examplepublic static void mainstatic int x = new in t15;Jwhich stateme nt is corrected?give the follow ing java class:public class examplepublic static void mainstatic int x = new in t15;which stat

16、eme nt is corrected?pile, some error will occur.run, some error will occur.is zero.is n ull.16:select valid ide ntifier of java:select valid ide ntifier of java:a.%passwd_gamec.$charge簡答題17:abstract class 和 in terface 有什么區(qū)別？18:hibernate中，什么情況下，對象的狀態(tài)可以由持久的變?yōu)橥泄艿?9:兩個數(shù)相乘，小數(shù)點(diǎn)后位數(shù)沒有限制，請寫一個高精度算法。20:求符合指定規(guī)則的數(shù)。這樣這現(xiàn)在給定函數(shù)d = n n 的各位之和，n為正整數(shù)，如d = 78 7 8=93 。 個函數(shù)可以看成一個生成器，如93可以看成由78生成。定義數(shù)a：數(shù)a找不到一個數(shù)b可以由d=a，即a不能由其他數(shù)生成 要寫程序，找出1至10000里的所有符合數(shù)a定義的數(shù)。輸出：13-強(qiáng)