Java练习题1有答案Word文档格式.docx
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4、Everymethodmustendwithasemicolon;
5、Everyclassmustendwithasemicolon;
答案2
第8题WhichofthefollowingstatementsiscorrecttodisplayWelcometoJavaontheconsole?
1、System.out.println（WelcometoJava）;
2、System.out.println（"
WelcometoJava"
）;
3、System.println（WelcometoJava）;
4、System.out.print（WelcometoJava）;
5、System.out.print（"
答案25
第9题WhichJDKcommandiscorrecttorunaJavaapplicationinByteCode.class?
1、javaByteCode
2、javaByteCode.class
3、javacByteCode.java
4、javacByteCode5、JAVACByteCode答案1第10题SupposeyoudefineaJavaclassasfollows:
publicclassTest{
}
Inordertocompilethisprogram,thesourcecodeshouldbestoredinafilenamed
1、Test.class
2、Test.doc
3、Test.txt
4、Test.java
5、Anynamewithextension.java答案4第11题TheextensionnameofaJavabytecodefileis
1、.java
2、.obj
3、.class
4、.exe答案3第12题WhichofthefollowinglinesisnotaJavacomment?
1、/**comments*/
2、//comments
3、--comments
4、/*comments*/
5、**comments**答案35第13题Whichofthefollowingarethereservedwords?
1、public
2、static
3、void4、class答案1234第14题TouseJOptionPaneinyourprogram,youmayimportitusing:
1、importjavax.swing.JOptionPane;
2、importjavax.swing.*;
3、importjavax.*;
4、importjavax.*.JOptionPane;
答案12
第15题WhichofthefollowingarecorrectnamesforvariablesaccordingtoJavanamingconventions?
1、radius
2、Radius
3、RADIUS
4、findArea5、FindArea答案14第16题Whichofthefollowingarecorrectwaystodeclarevariables?
1、intlength;
intwidth;
2、intlength,width;
3、intlength;
width;
4、intlength,intwidth;
答案12第17题____________istheJavaassignmentoperator.
1、==
2、:
=
3、=
4、=:
答案3第18题Whichofthefollowingassignmentstatementsisincorrect.
1、i=j=k=1;
2、i=1;
j=1;
k=1;
3、i=1=j=1=k=1;
4、i==j==k==1;
答案34第19题Whichofthefollowingisaconstant,accordingtoJavanamingconventions?
1、MAX_VALUE
2、Test
3、read
4、ReadInt5、COUNT答案15第20题Todeclareanintvariablenumberwithinitialvalue2,youwrite
1、intnumber=2L;
2、intnumber=2l;
3、intnumber=2;
4、intnumber=2.0;
答案3第21题Whichofthefollowingexpressionswillyield0.5?
1、1/2
2、1.0/2
3、（double）（1/2）
4、（double）1/25、1/2.0答案245第22题Whichofthefollowingexpressionresultsinavalue1?
1、2%1
2、15%4
3、25%54、37%6答案4第23题-25%5is_____
1、1
2、2
3、3
4、45、0答案5第24题-24%-5is_____
1、3
2、-3
3、4
4、-45、0答案4第25题Toaddnumbertosum,youwrite（Note:
Javaiscase-sensitive）
1、number+=sum;
2、number=sum+number;
3、sum=Number+sum;
4、sum+=number;
5、sum=sum+number;
答案45
第26题Supposexis1.Whatisxafterx-=1?
1、0
2、1
3、2
4、-15、-2答案1第27题Whatisxafterthefollowingstatements?
intx=1;
inty=2;
x*=y+1;
1、xis1;
2、xis2;
3、xis3;
4、xis4;
答案3第28题Whatisydisplayed?
publicclassTest{publicstaticvoidmain（String[]args）{intx=1;
inty=x+x++;
System.out.println（"
yis"
+y）;
1、yis1.
2、yis2.
3、yis3.
4、yis4.答案2第29题Whatisydisplayedinthefollowingcode?
inty=x+++x;
3、yis3.4、yis4.答案3第30题Whatistheprintoutofthefollowingcode:
doublex=5.5;
inty=（int）x;
System.out.println（"
xis"
+x+"
andyis"
1、xis5andyis6
2、xis6.0andyis6.0
3、xis6andyis6
4、xis5.5andyis55、xis5.5andyis5.0答案4第31题Supposexisacharvariablewithavalueb.WhatistheprintoutofthestatementSystem.out.println（++x）?
1、a
2、b
3、c4、d答案3第32题Supposeiisaninttypevariable.WhichofthefollowingstatementsdisplaythecharacterwhoseUnicodeisstoredinvariablei?
1、System.out.println（i）;
2、System.out.println（（char）i）;
3、System.out.println（（int）i）;
4、System.out.println（i+"
"
答案2第33题Thefollowingcodefragmentreadsintwonumbers:
Scannerinput=newScanner（System.in）;
inti=input.nextInt（）;
doubled=input.nextDouble（）;
Whatarethecorrectwaystoenterthesetwonumbers?
1、Enteraninteger,aspace,adoublevalue,andthentheEnterkey.
2、Enteraninteger,twospaces,adoublevalue,andthentheEnterkey.
3、Enteraninteger,anEnterkey,adoublevalue,andthentheEnterkey.4、Enteranumericvaluewithadecimalpoint,aspace,aninteger,andthentheEnterkey.答案123第34题Ifyouenter123,whenyourunthisprogram,whatwillbetheoutput?
importjava.util.Scanner;
publicclassTest1{
publicstaticvoidmain（String[]args）{Scannerinput=newScanner（System.in）;
System.out.print（"
Enterthreenumbers:
doublenumber1=input.nextDouble（）;
doublenumber2=input.nextDouble（）;
doublenumber3=input.nextDouble（）;
//Computeaveragedoubleaverage=（number1+number2+number3）/3;
//Displayresult
System.out.println（average）;
1、1.0
2、2.0
3、3.0
4、4.0答案2第35题Theexpression（int）（76.0252175*100）/100evaluatesto_________.
1、76.02
2、76
3、76.02521754、76.03答案2第36题AccordingtoJavanamingconvention,whichofthefollowingnamescanbevariables?
1、FindArea
2、findArea
3、totalLength
4、TOTAL_LENGTH
5、class答案23第37题The__________methoddisplaysaninputdialogforreadingastring.
1、Stringstring=JOptionPane.showMessageDialog（null,"
Enterastring"
"
InputDemo"
JOptionPane.QUESTION_MESSAGE）;
2、Stringstring=JOptionPane.showInputDialog（null,"
3、Stringstring=JOptionPane.showInputDialog（"
"
4、Stringstring=JOptionPane.showInputDialog（null,"
5、Stringstring=JOptionPane.showInputDialog（"
答案245第38题Analyzethefollowingcode.
importjavax.swing.*;
publicclassShowErrors{publicstaticvoidmain（String[]args）{inti;
intj;
Strings=JOptionPane.showInputDialog（null,
Enteraninteger"
Input"
JOptionPane.QUESTION_MESSAGE）;
j=Integer.parseInt（s）;
i=（i+4）;
1、Theprogramcannotcompilebecausejisnotinitialized.
2、Theprogramcannotcompilebecauseidoesnothaveaninitialvaluewhenitisusedini=i+4;
3、Theprogramcompilesbuthasaruntimeerrorbecauseidoesnothaveaninitialvaluewhenitisusedini=i+4;
4、Theprogramcompilesandrunsfine.答案2第39题Supposex=10andy=10.Whatisxafterevaluatingtheexpression（y>
10）&
&
（x-->
10）?
1、9
2、103、11答案2第40题Supposex=10andy=10whatisxafterevaluatingtheexpression
（y>
=10）||（x++>
10）.
2、103、11答案2第41题Supposex=1,y=-1,andz=1.Whatistheprintoutofthefollowingstatement?
（Pleaseindentthestatementcorrectlyfirst.）if（x>
0）if（y>
0）
x>
0andy>
0"
elseif（z>
x<
0andz>
1、x>
0;
2、x<
3、x<
0andz<
4、noprintout.
答案2第42题Analyzethefollowingcode.
booleaneven=false;
if（even）{
Itiseven!
1、ThecodedisplaysItiseven!
2、Thecodedisplaysnothing.
3、Thecodeiswrong.Youshouldreplaceif（even）withif（even==true）
4、Thecodeiswrong.Youshouldreplaceif（even）withif（even=true）答案2
第43题Thefollowingcodedisplays___________.
doubletemperature=50;
if（temperature>
=100）System.out.println（"
toohot"
elseif（temperature<
=40）System.out.println（"
toocold"
else
justright"
1、toohot
2、toocold
3、justright
4、toohottoocoldjustright答案3第44题Analyzethefollowingcode:
Code1:
booleaneven;
if（number%2==0）even=true;
elseeven=false;
Code2:
booleaneven=（number%2==0）;
1、Code1hascompileerrors.
2、Code2hascompileerrors.
3、BothCode1andCode2havecompileerrors.
4、BothCode1andCode2arecorrect,butCode2isbetter.答案4第45题The__________methodimmediatelyterminatestheprogram.
1、System.terminate（0）;
2、System.halt（0）;
3、System.exit（0）;
4、System.stop（0）;
答案3第46题Whatistheprintou
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