Java上机实验报告.docx
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Java上机实验报告
Java上机实验报告
练习2
1、WORKINGWITHNUMERICVALUES
DemoVariables.java
publicclassDemoVariables{
publicstaticvoidmain（String[]args）{
intentry=315;
System.out.print（"Theentryis"）;
System.out.println（entry）;
}
}
2、ACCEPTINGUSERDATA
DemoVariables2.java
importjava.util.Scanner;
publicclassDemoVariables2{
publicstaticvoidmain（String[]args）{
intentry;
ScannerkeyBoard=newScanner（System.in）;
System.out.print（"Enteraninteger"）;
entry=keyBoard.nextInt（）;
System.out.print（"Theentryis"）;
System.out.println（entry）;
}
}
3、PERFORMINGARITHMETIC
DemoVariables3.java
importjava.util.Scanner;
publicclassDemoVariables3{
publicstaticvoidmain（String[]args）{
intentry;
intanotherEntry;
ScannerkeyBoard=newScanner（System.in）;
System.out.print（"Enteraninteger"）;
entry=keyBoard.nextInt（）;
System.out.print（"Enteranotherinteger"）;
anotherEntry=keyBoard.nextInt（）;
System.out.println（entry+"plus"+
anotherEntry+"is"+（entry+anotherEntry））;
System.out.println（entry+"minus"+
anotherEntry+"is"+（entry-anotherEntry））;
System.out.println（entry+"times"+
anotherEntry+"is"+（entry*anotherEntry））;
System.out.println（entry+"dividedby"+
anotherEntry+"is"+（entry/anotherEntry））;
System.out.println（"Theremainderis"+
（entry%anotherEntry））;
}
}
练习4
1、CREATINGASTATICMETHODTHATREQUIRESNOARGUMENTSANDRETURNSNOVALUES
SetUpSite.java
publicclassSetUpSite{
publicstaticvoidstatementOfPhilosophy（）{
System.out.println（"EventHandlersIncorporatedis"）;
System.out.println（"dedicatedtomakingyourevent"）;
System.out.println（"amostmemorableone."）;
}
publicstaticvoidmain（String[]args）{
statementOfPhilosophy（）;
}
}
2、CALLINGASTATICMETHODFROMANOTHERCLASS
TestStatement.java
publicclassTestStatement{
publicstaticvoidmain（String[]args）{
System.out.println（"Callingmethodfromanotherclass"）;
SetUpSite.statementOfPhilosophy（）;
}
}
3、CREATINGASTATICMETHODTHATACCEPTSARGUMENTSANDRETURNSVALUES
SetUpSite2.java
importjava.util.Scanner;
publicclassSetUpSite2{
publicstaticvoidstatementOfPhilosophy（）{
System.out.println（"EventHandlersIncorporatedis"）;
System.out.println（"dedicatedtomakingyourevent"）;
System.out.println（"amostmemorableone."）;
}
publicstaticintcalculateAge（intoriginYear,intcurrDate）{
intyears;
years=currDate-originYear;
returnyears;
}
publicstaticvoidmain（String[]args）{
finalintFOUNDED_YEAR=1977;
intcurrentYear;
intage;
Scannerinput=newScanner（System.in）;
System.out.print（"Enterthecurrentyearasafour-digitnumber"）;
currentYear=input.nextInt（）;
age=calculateAge（FOUNDED_YEAR,currentYear）;
System.out.println（"Foundedin"+FOUNDED_YEAR）;
System.out.println（"Servingyoufor"+age+"years"）;
}
}
4、CREATINGACLASSTHATCONTAINSINSTANCEFIELDSANDMETHODS
EventSite.java
publicclassEventSite{
privateintsiteNumber;
publicintgetSiteNumber（）{
returnsiteNumber;
}
publicvoidsetSiteNumber（intn）{
siteNumber=n;
}
}
5、CREATINGACLASSTHATINSTANTIATESOBJECTSOFANOTHERCLASS
SetUpSite3.java
importjava.util.Scanner;
publicclassSetUpSite3{
publicstaticvoidstatementOfPhilosophy（）{
System.out.println（"EventHandlersIncorporatedis"）;
System.out.println（"dedicatedtomakingyourevent"）;
System.out.println（"amostmemorableone."）;
}
publicstaticintcalculateAge（intoriginYear,intcurrDate）{
intyears;
years=currDate-originYear;
returnyears;
}
publicstaticvoidmain（String[]args）{
statementOfPhilosophy（）;
finalintFOUNDED_YEAR=1977;
intcurrentYear;
intage;
EventSiteoneSite=newEventSite（）;
intsiteNum;
Scannerinput=newScanner（System.in）;
System.out.print（"Enterthecurrentyearasafour-digitnumber"）;
currentYear=input.nextInt（）;
System.out.print（"Entertheeventsitenumber"）;
siteNum=input.nextInt（）;
age=calculateAge（FOUNDED_YEAR,currentYear）;
System.out.println（"Foundedin"+FOUNDED_YEAR）;
System.out.println（"Servingyoufor"+age+"years"）;
oneSite.setSiteNumber（siteNum）;
System.out.println（"Thesitenumberis"+
oneSite.getSiteNumber（））;
}
}
6、ADDINGACONSTRUCTORTOACLASS
EventSite.java
publicclassEventSite{
privateintsiteNumber;
publicEventSite（）{
siteNumber=999;
}
publicintgetSiteNumber（）{
returnsiteNumber;
}
publicvoidsetSiteNumber（intn）{
siteNumber=n;
}
}
TestConstructor.java
publicclassTestConstructor{
publicstaticvoidmain（String[]args）{
EventSiteoneSite=newEventSite（）;
System.out.println（"Sitenumber"+oneSite.getSiteNumber（））;
}
}
练习5
1、DEMONSTRATINGSCOPE
DemoBlock.java
publicclassDemoBlock{
publicstaticvoidmain（String[]args）{
System.out.println（"Demonstratingblockscope"）;
intx=1111;
System.out.println（"Infirstblockxis"+x）;
{
inty=2222;
System.out.println（"Insecondblockxis"+x）;
System.out.println（"Insecondblockyis"+y）;
}
{
inty=3333;
System.out.println（"Inthirdblockxis"+x）;
System.out.println（"Inthirdblockyis"+y）;
demoMethod（）;
System.out.println（"Aftermethodxis"+x）;
System.out.println（"Aftermethodblockyis"+y）;
}
System.out.println（"Attheendxis"+x）;
}
publicstaticvoiddemoMethod（）{
intx=8888,y=9999;
System.out.println（"IndemoMethodxis"+x）;
System.out.println（"IndemoMethodblockyis"+y）;
}
}
2、OVERLOADINGMETHODS
publicclassDemoOverload{
publicstaticvoidoverloadDate（intmm）{
System.out.println（"Eventdate"+mm+"/1/2011"）;
}
publicstaticvoidoverloadDate（intmm,intdd）{
System.out.println（"Eventdate"+mm+"/"+dd+"/2011"）;
}
publicstaticvoidoverloadDate（intmm,intdd,intyy）{
System.out.println（"Eventdate"+mm+"/"+dd+"/"+yy）;
}
publicstaticvoidmain（String[]args）{
intmonth=6,day=24,year=2010;
overloadDate（month）;
overloadDate（month,day）;
overloadDate（month,day,year）;
}
}
3、CREATINGACONSTRUCTORTHATREQUIRESANARGUMENT
EventSite.java
publicclassEventSite{
privateintsiteNumber;
privatedoublefee;
privateStringname;
publicEventSite（）{
siteNumber=999;
fee=0;
name="XXX";
}
publicEventSite（intsiteNum）{
this（）;
siteNumber=siteNum;
}
publicintgetSiteNumber（）{
returnsiteNumber;
}
publicvoidsetSiteNumber（intn）{
siteNumber=n;
}
publicdoublegetFee（）{
returnfee;
}
publicvoidsetFee（doublen）{
fee=n;
}
publicStringgetName（）{
returnname;
}
publicvoidsetName（Stringn）{
name=n;
}
}
DemoConstructor.java
publicclassDemoConstructor{
publicstaticvoiddisplay（EventSitesite）{
System.out.println（"\nEventsite#"+site.getSiteNumber（）+
"\nFeeis$"+site.getFee（）+
"\nNameofsiteis"+site.getName（））;
}
publicstaticvoidmain（String[]args）{
EventSitesite1=newEventSite（）;
EventSitesite2=newEventSite（678）;
display（site1）;
display（site2）;
}
}
4、USINGANEXPLICITLYIMPORTEDPREWRITTENCLASS
CalendarDemo.java
importjava.util.*;
publicclassCalendarDemo{
publicstaticvoidmain（String[]args）{
GregorianCalendarnow=newGregorianCalendar（）;
System.out.println（"YEAR:
"+now.get（Calendar.YEAR））;
System.out.println（"MONTH:
"+now.get（Calendar.MONTH））;
System.out.println（"WEEK_OF_YEAR:
"+
now.get（Calendar.WEEK_OF_YEAR））;
System.out.println（"WEEK_OF_MONTH:
"+
now.get（Calendar.WEEK_OF_MONTH））;
System.out.println（"DATE:
"+now.get（Calendar.DATE））;
System.out.println（"DAY_OF_MONTH:
"+
now.get（Calendar.DAY_OF_MONTH））;
System.out.println（"DAY_OF_YEAR:
"+
now.get（Calendar.DAY_OF_YEAR））;
System.out.println（"DAY_OF_WEEK:
"+
now.get（Calendar.DAY_OF_WEEK））;
System.out.println（"AM_PM:
"+
now.get（Calendar.AM_PM））;
System.out.println（"HOUR:
"+now.get（Calendar.HOUR））;
System.out.println（"HOUR_OF_DAY:
"+
now.get（Calendar.HOUR_OF_DAY））;
System.out.println（"MINUTE:
"+
now.get（Calendar.MINUTE））;
System.out.println（"SECOND:
"+
now.get（Calendar.SECOND））;
System.out.println（"MILLISECOND:
"+
now.get（Calendar.MILLISECOND））;
}
}
5、CREATINGANINTERACTIVEAPPLICATIONWITHATIMER
DialogTimer.java
importjavax.swing.JOptionPane;
importjava.util.*;
publicclassDialogTimer{
publicstaticvoidmain（String[]args）{
inttime1,time2,milli1,milli2,sec1,
sec2,timeDifference;
finalintMILLISECSINSECOND=1000;
JOptionPane.showConfirmDialog（null,"Isstealingeverjustified?
"）;
GregorianCalendarbefore=newGregorianCalendar（）;
milli1=before.get（GregorianCalendar.MILLISECOND）;
sec1=before.get（GregorianCalendar.SECOND）;
time1=MILLISECSINSECOND*sec1+milli1;
GregorianCalendarafter=newGregorianCalendar（）;
milli2=after.get（GregorianCalendar.MILLISECOND）;
sec2=after.get（GregorianCalendar.SECOND）;
time2=MILLISECSINSECOND*sec2+milli2;
timeDifference=time2-time1;
JOptionPane.showMessageDialog（null,"Ittook"+
timeDifference+"millisecondsforyoutoanswer"）;
}
}
练习7
1、TocreatethegeneralEventclass:
Event.java
importjavax.swing.*;
publicclassEvent{
privateinteventGuests;
publicvoiddisplayEventGuests（）{
JOptionPane.showMessageDialog（null,"Eventguests:
"+
eventGuests）;
}
publicvoidinputEventGuests（）{
charinChar;
StringguestsString=newString（""）;
guestsString=JOptionPane.s
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