java程序設(shè)計復(fù)習(xí)題

1、Java程序設(shè)計復(fù)習(xí)題程序設(shè)計復(fù)習(xí)題一、單項(xiàng)選擇題一、單項(xiàng)選擇題1下面哪些是java語言中的關(guān)鍵字？AsizeofBabstractCNULLDNative2下面語句哪個是正確的？A=abcBlongl=oxfffCfloatf=0.23Ddouble=0.7E33以下程序測試String類的各種構(gòu)造方法，試選出其運(yùn)行效果。classSTRpublicstaticvoidmain(Stringargs[])Strings1=newStr

2、ing()Strings2=newString(“String2“)s[]=astringStrings3=newString(s)Strings4=newString(s26)bytebytes[]=0123456789StringBuffersb=newStringBuffer(s3)Strings5=newString(sb)System.out.println(“TheStringNo.1is“s1)System.out.pri

3、ntln(“TheStringNo.2is“s2)System.out.println(“TheStringNo.3is“s3)System.out.println(“TheStringNo.4is“s4)System.out.println(“TheStringNo.5is“s5)ATheStringNo.1isTheStringNo.2isString2TheStringNo.3isastringTheStringNo.4isstr

4、ingTheStringNo.5isastringBTheStringNo.1isTheStringNo.2isString2TheStringNo.3isastringTheStringNo.4istringTheStringNo.5isastringCTheStringNo.1isTheStringNo.2isString2TheStringNo.3isastringTheStringNo.4isstrinTheStringNo.5

5、isastringD以上都不對4下面語句段的輸出結(jié)果是什么？inti=9publicExSuper(StringsStringt)name=snick_name=tpublicStringtoString()returnnamepublicclassExampleextendsExSuperpublicExample(StringsStringt)super(st)publicStringtoString()returnname“a.k

6、.a“nick_namepublicstaticvoidmain(Stringargs[])ExSupera=newExSuper(“First““1st“)ExSuperb=newExample(“Second““2nd“)System.out.println(“ais“a.toString())System.out.println(“bis“b.toString())A編譯時會出現(xiàn)例外。B運(yùn)行結(jié)果為：aisFirstbissecon

7、dC運(yùn)行結(jié)果為：aisFirstbisSeconga.k.a2ndD運(yùn)行結(jié)果為：aisFirsta.k.a1ndbisSeconda.k.a2nd9運(yùn)行下列程序的結(jié)果是哪個？abstractclassMineBaseabstractvoidamethod()staticintipublicclassMineextendsMineBasepublicstaticvoidmain(Stringargv[])int[]ar=newint[5]