java语言程序设计解答例题复习题答案06review.pdf

Chapter6Single-dimensionalArrays

1.SeethesectionDeclaringandCreatingArrays.

2.Youaccessanarrayusingitsindex.

3.Nomemoryisallocatedwhenanarrayisdeclared.Thememoryisallocatedwhen

creatingthearray.

xis60

Thesizeofnumbersis30

4.Indicatetrueorfalseforthefollowingstatements:

1.Everyelementinanarrayhasthesametype.

Answer:True

2.Thearraysizeisfixedafteritisdeclared.

Answer:False

3.Thearraysizeisfixedafteritiscreated.

Answer:True

4.Theelementinthearraymustbeofprimitivedatatype.

Answer:False

5.Whichofthefollowingstatementsarevalidarraydeclarations?

inti=newint(30);

Answer:Invalid

doubled[]=newdouble[30];

Answer:Valid

char[]r=newchar(1..30);

Answer:Invalid

inti[]=(3,4,3,2);

Answer:Invalid

floatf[]={2.3,4.5,5.6};

Answer:Valid

char[]c=newchar();

Answer:Invalid

6.Thearrayindextypeisintanditslowestindexis0.

a[2]

7.

(a)

double[]list=newdouble[10];

(b)

list[list.length–1]=5.5;

(c)

System.out.println(list[0]+list[1]