JAVA编程思想课后习题答案.docx

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JAVA编程思想课后习题答案.docx

JAVA编程思想课后习题答案

Java编程思想〔第四版〕习题答案

第二章

练习1:

publicclassPrimitiveTest{

staticinti;

staticcharc;

publicstaticvoidmain(String[]args){

System.out.println("int="+i);

System.out.println("char="+c);

}

}

练习2:

publicclassHelloWorld{

publicstaticvoidmain(String[]args){

System.out.println("HelloWorld!

");

}

}

练习3:

publicclassATNTest{

publicstaticvoidmain(String[]args){

classATypeName{

inti;

doubled;

booleanb;

voidshow(){

System.out.println(i);

System.out.println(d);

System.out.println(b);

}

}

ATypeNamea=newATypeName();

a.i=3;

a.d=2.71828;

a.b=false;

a.show();

}

}

练习4:

publicclassDataOnlyTest{

publicstaticvoidmain(String[]args){

classDataOnly{

inti;

doubled;

booleanb;

voidshow(){

System.out.println(i);

System.out.println(d);

System.out.println(b);

}

}

DataOnlydata=newDataOnly();

data.i=3;

data.d=2.71828;

data.b=false;

data.show();

}

}

练习5:

publicclassDOTest2{

publicstaticvoidmain(String[]args){

classDataOnly{

inti;

doubled;

booleanb;

voidshow(){

System.out.println(i);

System.out.println(d);

System.out.println(b);

}

}

DataOnlydata=newDataOnly();

data.i=234;

data.d=2.1234545;

data.b=true;

data.show();

}

}

练习6:

publicclassStorageTest{

publicstaticvoidmain(String[]args){

classStoreStuff{

intstorage(Strings){

returns.length()*2;

}

}

StoreStuff*=newStoreStuff();

System.out.println(*.storage("hi"));

}

}

练习7:

classStaticTest{

staticinti=47;

}

classIncrementable{

staticvoidincrement(){StaticTest.i++;}

}

publicclassITest{

publicstaticvoidmain(String[]args){

System.out.println("StaticTest.i="+StaticTest.i);

StaticTestst1=newStaticTest();

StaticTestst2=newStaticTest();

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

Incrementablesf=newIncrementable();

sf.increment();

System.out.println("Aftersf.increment()called:

");

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

Incrementable.increment();

System.out.println("AfterIncrementable.incrementcalled:

");

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

}

}

练习8:

classStaticTest{

staticinti=47;

}

classIncrementable{

staticvoidincrement(){StaticTest.i++;}

}

publicclassOneStaticTest{

publicstaticvoidmain(String[]args){

System.out.println("StaticTest.i="+StaticTest.i);

StaticTestst1=newStaticTest();

StaticTestst2=newStaticTest();

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

Incrementable.increment();

System.out.println("AfterIncrementable.increment()called:

");

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

Incrementable.increment();

System.out.println("AfterIncrementable.incrementcalled:

");

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

st1.i=3;

System.out.println("Afterst1.i=3,");

System.out.println("st1.i="+st1.i);

System.out.println("st2.i="+st2.i);

System.out.println("CreateanotherStaticTest,st3.");

StaticTestst3=newStaticTest();

System.out.println("st3.i="+st3.i);

}

}

练习9:

publicclassAutobo*Test{

publicstaticvoidmain(String[]args){

booleanb=false;

charc='*';

bytet=8;

shorts=16;

inti=32;

longl=64;

floatf=0.32f;

doubled=0.64;

BooleanB=b;

System.out.println("booleanb="+b);

System.out.println("BooleanB="+B);

CharacterC=c;

System.out.println("charc="+c);

System.out.println("CharacterC="+C);

ByteT=t;

System.out.println("bytet="+t);

System.out.println("ByteT="+T);

ShortS=s;

System.out.println("shorts="+s);

System.out.println("ShortS="+S);

IntegerI=i;

System.out.println("inti="+i);

System.out.println("IntegerI="+I);

LongL=l;

System.out.println("longl="+l);

System.out.println("LongL="+L);

FloatF=f;

System.out.println("floatf="+f);

System.out.println("FloatF="+F);

DoubleD=d;

System.out.println("doubled="+d);

System.out.println("DoubleD="+D);

}

}

练习10:

publicclassmandArgTest{

publicstaticvoidmain(String[]args){

System.out.println("args[0]="+args[0]);

System.out.println("args[1]="+args[1]);

System.out.println("args[2]="+args[2]);

}

}

练习11:

publicclassRainbow{

publicstaticvoidmain(String[]args){

AllTheColorsOfTheRainbowatc=newAllTheColorsOfTheRainbow();

System.out.println("atc.anIntegerRepresentingColors="+atc.anIntegerRepresentingColors);

atc.changeColor(7);

atc.changeTheHueOfTheColor(77);

System.out.println("Aftercolorchange,atc.anIntegerRepresentingColors="+atc.anIntegerRepresentingColors);

System.out.println("atc.hue="+atc.hue);

}

}

classAllTheColorsOfTheRainbow{

intanIntegerRepresentingColors=0;

inthue=0;

voidchangeTheHueOfTheColor(intnewHue){

hue=newHue;

}

intchangeColor(intnewColor){

returnanIntegerRepresentingColors=newColor;

}

}

练习12:

publicclassDocTest{

/**Entrypoingtoclass&application.

*paramargsarrayofstringarguments

*throwse*ceptionsNoe*ceptionsthrown

*/

publicstaticvoidmain(String[]args){

System.out.println("Hello,it's:

");

System.out.println(newDate());

}

}

练习13-1:

publicclassDocumentation1{

/**Afieldment*/

publicinti;

/**Amethodment*/

publicvoidf(){}

}

2:

publicclassDocumentation2{

Dated=newDate();

voidshowDate(){

System.out.println("Date="+d);

}

}

3:

publicclassDocumentation3{

publicstaticvoidmain(String[]args){

Dated=newDate();

System.out.println("d="+d);

}

}

练习14:

publicclassDocumentation4{

publicinti=2;

privateintj=3;

publicstaticvoidmain(String[]args){

Dated=newDate();

System.out.println("d="+d);

}

}

练习15:

publicclassHelloDocTest{

publicstaticvoidmain(String[]args){

System.out.println("HelloWorld!

");

}

}

练习16:

classTree{

intheight;

Tree(){

System.out.println("Plantingaseedling");

height=0;

}

Tree(intinitialHeight){

height=initialHeight;

System.out.println("Creatingnewtreethatis"+height+"feettall");

}

voidinfo(){

System.out.println("Treeis"+height+"feettall");

}

voidinfo(Strings){

System.out.println(s+":

Treeis"+height+"feettall");

}

}

publicclassOverloading{

publicstaticvoidmain(String[]args){

for(inti=0;i<5;i++){

Treet=newTree(i);

t.info();

t.info("overloadingmethod");

}

//Overloadedconstructor:

newTree();

}

}

第三章

练习1:

publicclassPrintTest{

publicstaticvoidmain(String[]args){

print("Hello,fromshortform.");

P.rintln("Hellofromgreggordonform.");

System.out.println("Hellofromlongform.");

}

}

练习2:

classTube{

floatlevel;

}

publicclassAssign{

publicstaticvoidmain(String[]args){

Tubet1=newTube();

Tubet2=newTube();

t1.level=0.9f;

t2.level=0.47f;

P.rintln("1:

t1.level:

"+t1.level+",t2.level:

"+t2.level);

t1=t2;

P.rintln("2:

t1.level:

"+t1.level+",t2.level:

"+t2.level);

t1.level=0.27f;

P.rintln("3:

t1.level:

"+t1.level+",t2.level:

"+t2.level);

}

}

练习3:

classBo*{

floata;

}

publicclassPassObject2{

staticvoidf(Bo*y){

y.a=2.71828f;

}

publicstaticvoidmain(String[]args){

Bo**=newBo*();

*.a=3.1416f;

print("1:

*.a="+*.a);

f(*);

print("2:

*.a="+*.a);

}

}

练习4:

classVelocityCalculator{

staticfloatvelocity(floatd,floatt){

if(t==0)return0f;

elsereturnd/t;

}

}

publicclassVelocityTester{

publicstaticvoidmain(String[]args){

floatd=565.3f;

floatt=3.6f;

System.out.println("Distance:

"+d);

System.out.println("Time:

"+t);

floatv=VelocityCalculator.velocity(d,t);

System.out.println("Velocity:

"+v);

}

}

练习5:

classDog{

Stringname;

Stringsays;

voidsetName(Stringn){

name=n;

}

voidsetSays(Strings){

says=s;

}

voidshowName(){

P.rintln(name);

}

voidspeak(){

P.rintln(says);

}

}

publicclassDogTest{

publicstaticvoidmain(String[]args){

Dogspot=newDog();

spot.setName("Spot");

spot.setSays("Ruff!

");

Dogscruffy=newDog();

scruffy.setName("Scruffy");

scruffy.setSays("Wurf!

");

spot.showName();

spot.speak();

scruffy.showName();

scruffy.speak();

}

}

练习6:

classDog{

Stringname;

Stringsays;

voidsetName(Stringn){

name=n;

}

voidsetSays(Strings){

says=s;

}

voidshowName(){

P.rintln(name);

}

voidspeak(){

P.rintln(says);

}

}

publicclassDogpare{

publicstaticvoidmain(String[]args){

Dogspot=newDog();

spot.setName("Spot");

spot.setSays("Ruff!

");

Dogscruffy=newDog();

scruffy.setName("Scruffy");

scruffy.setSays("Wurf!

");

spot.showName();

spot.speak();

scruffy.showName();

scruffy.speak();

Dogbutch=newDog();

butch.setName("Butch");

butch.setSays("Hello!

");

butch.showName();

butch.speak();

P.rintln("parison:

");

P.rintln("spot==butch:

"+(spot==butch));

P.rintln("spot.equals(butch):

"+spot.equals(butch));

P.rintln("butch.equals(spot):

"+butch.equals(spot));

P.rintln("Nowassign:

spot=butch");

spot=butch;

P.rintln("pareagain:

");

P.rintln("spot==butch:

"+(spot==butch));

P.rintln("spot.equals(butch):

"

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