耿祥义张跃平java大学实用教程编程题答案DOC.docx

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耿祥义张跃平java大学实用教程编程题答案DOC.docx

耿祥义张跃平java大学实用教程编程题答案DOC

习题解答

第一章作业题

1.

publicclassHello{

publicstaticvoidmain(Stringargs[]){

System.out.pintln(“早上好,goodMorning”);

}

}

2.

importjava.applet.*;

importjava.awt.*;

publicclassBoyextendsApplet{

publicvoidpaint(Graphicsg){

g.setColor(Color.blue);

g.drawString("你好,hello",12,30);

}

}

第二章作业题

1.

publicclassZuoYe2_1{

publicstaticvoidmain(Stringargs[]){

charc='а';

System.out.println("字母"+c+"在unicode表中的顺序位置:

"+(int)c);

System.out.println("字母表:

");

while(c<='я'){

System.out.print(""+c);

c=(char)(c+1);

}

}

}

2.

importjava.util.*;

publicclassZuoYe2_2{

publicstaticvoidmain(Stringargs[]){

Scannerreader=newScanner(System.in);

longchengji=1;

intm=0;

while(reader.hasNextInt()){

intx=reader.nextInt();

m=m+1;

chengji=chengji*x;

}

System.out.println(m+"个数的乘积为"+chengji);

}

}

第三章作业题

1.

importjava.util.*;

publicclassZuoYe3_1{

publicstaticvoidmain(Stringargs[]){

Scannerreader=newScanner(System.in);

doubley=0,x=0;

x=reader.nextDouble();

if(x<0)

y=-1+2*x;

elseif(x==0)

y=-1;

elseif(x>0)

y=-1+3*x;

System.out.println(y);

}

}

2.

publicclassZuoYe3_2{

publicstaticvoidmain(Stringargs[]){

intsum=0,m=3,n=7,a=1;

while(a<=1000){

if(a%m==0&&a%n==0)

sum=sum+a;

a++;

}

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

}

}

3.

publicclassZuoYe3_3

{

publicstaticvoidmain(Stringargs[])

{

longsum=0,a=8,item=a,n=10,i=1;

for(i=1;i<=n;i++)

{sum=sum+item;

item=item*10+a;

}

System.out.println(sum);

}

}

4.

publicclassZuoYe3_4

{

publicstaticvoidmain(Stringargs[])

{

doublesum=0,a=1,b=1,fuhao=1,item=a/b;

inti=1;

while(i<=1000)

{

sum=sum+fuhao*item;

i++;

fuhao=fuhao*(-1);

b=b+2;

item=a/b;

}

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

}

}

5.

publicclassZuoYe3_5

{

publicstaticvoidmain(Stringargs[])

{

doublesum=0,a=1;

inti=1;

while(i<=20)

{

if(i>=10)

sum=sum+a;

i++;

a=a*i;

}

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

}

}

8.

第四章作业题

1.

classDengCha{

intstart,d;

DengCha(){

}

DengCha(intstart,intd){

this.start=start;

this.d=d;

}

voidsetStart(ints){

start=s;

}

voidsetD(intd){

this.d=d;

}

intgetSum(intn){

intsum=0,i=1;

while(i<=n){

sum=sum+start;

start=start+d;

i++;

}

returnsum;

}

}

publicclassZuoYe4_1

{

publicstaticvoidmain(Stringargs[])

{

DengChashulie=newDengCha(2,3);

System.out.println(shulie.getSum(100));

shulie.setStart(10);

shulie.setD(5);

System.out.println(shulie.getSum(9));

}

}

2.

classLetter{

publicvoidprintLetter(){

for(charc='a';c<='z';c++)

System.out.print(""+c);

}

}

publicclassZuoYe4_2

{

publicstaticvoidmain(Stringargs[])

{

Letterp=newLetter();

p.printLetter();

}

}

3.

classSquareEquation{

doublea,b;

staticdoublec;

doubleroot1,root2;

booleanboo;

publicSquareEquation(doublea,doubleb,doublec){

this.a=a;

this.b=b;

SquareEquation.c=c;

if(a!

=0){

boo=true;

}

else{

boo=false;

}

}

publicvoidgetRoots(){

if(boo){

System.out.println("是一元2次方程");

doubledisk=b*b-4*a*c;

if(disk>=0){

root1=(-b+Math.sqrt(disk))/(2*a);

root2=(-b-Math.sqrt(disk))/(2*a);

System.out.printf("方程的根:

%f,%f\n",root1,root2);

}

else{

System.out.printf("方程没有实根\n");

}

}

else{

System.out.println("不是一元2次方程");

}

}

publicvoidsetCoefficient(doublea,doubleb,doublec){

this.a=a;

this.b=b;

SquareEquation.c=c;

if(a!

=0){

boo=true;

}

else{

boo=false;

}

}

}

publicclassZuoYe4_3{

publicstaticvoidmain(Stringargs[]){

SquareEquationequation1=newSquareEquation(4,5,1);

SquareEquationequation2=newSquareEquation(3,5,-7);

equation1.getRoots();

equation2.getRoots();

}

}

4.

importjava.util.Scanner;

classA{

intf(intm,intn){

if(m*n<0)

{System.out.println("有负数,程序退出");

System.exit(0);

}

if(m

{inttemp=m;

m=n;

n=temp;

}

inta=m,b=n;

intr=m%n;

while(r!

=0)

{m=n;

n=r;

r=m%n;

}

returnn;

}

}

classB{

Aa;

B(){

a=newA();

}

intg(intm,intn){

inttemp=a.f(m,n);

returnm*n/temp;

}

}

publicclassZuoYe4_4

{

publicstaticvoidmain(Stringargs[])

{

Scannerreader=newScanner(System.in);

System.out.println("输入2个正整数,程序计算出它们的最大公约数和最小公倍数");

System.out.print("输入第一个整数:

");

intm=reader.nextInt();

System.out.print("输入第二个整数:

");

intn=reader.nextInt();

Aa=newA();

Bb=newB();

System.out.println(m+"和"+n+"的最大公约数是"+a.f(m,n));

System.out.println(m+"和"+n+"的最小公倍数是"+b.g(m,n));

}

}

5.

importjava.applet.Applet;

importjava.awt.*;

publicclassExample4_10extendsApplet

{

Buttonredbutton;

publicvoidinit()

{

redbutton=newButton("我是一个红色的按钮");

redbutton.setBackground(Color.red);

redbutton.setForeground(Color.white);

add(redbutton);

}

}

第五章作业题

1.

importjava.util.Scanner;

classA

{

publicintf(intm,intn)

{

if(m

{

inttemp=m;

m=n;

n=temp;

}

intr=m%n;

while(r!

=0)

{

m=n;

n=r;

r=m%n;

}

returnn;

}

}

classBextendsA

{

publicintf(intm,intn)

{

intdivision=super.f(m,n);

return(m*n)/division;

}

}

publicclassZuoYe5_1

{

publicstaticvoidmain(Stringargs[])

{

Aa=newA();

Bb=newB();

Scannerreader=newScanner(System.in);

System.out.println("输入2个整数,程序计算出它们的最大公约数和最小公倍数");

System.out.print("输入第一个整数:

");

intm=reader.nextInt();

System.out.print("输入第二个整数:

");

intn=reader.nextInt();

if(m*n<0)

{System.out.println("有负数,程序退出");

System.exit(0);

}

System.out.printf("%d和%d的最大公约数是%d\n",m,n,a.f(m,n));

System.out.printf("%d和%d的最小公倍数是%d\n",m,n,b.f(m,n));

}

}

2.

abstractclassA{

publicabstractvoidf(intx);

publicabstractvoidg(intx,inty);

publicabstractdoubleh(doublex);

}

classA1extendsA{

publicvoidf(intx){

System.out.println(x);

}

publicvoidg(intx,inty){

intz=x+y;

System.out.println(z);

}

publicdoubleh(doublex){

returnx*x;

}

}

classA2extendsA{

publicvoidf(intx){

System.out.println("Hello:

"+x);

}

publicvoidg(intx,inty){

intz=x-y;

System.out.println(z);

}

publicdoubleh(doublex){

returnMath.sqrt(x);

}

}

classA3extendsA{

publicvoidf(intx){

System.out.println("你好:

"+x);

}

publicvoidg(intx,inty){

doublez=(double)x/y;

System.out.println(z);

}

publicdoubleh(doublex){

return1/x;

}

}

publicclassZuoYe5_2{

publicstaticvoidmain(Stringargs[]){

Aa=newA1();

a.f(10);

a.g(12,20);

System.out.println(a.h(100));

a=newA2();

a.f(10);

a.g(12,20);

System.out.println(a.h(100));

a=newA3();

a.f(10);

a.g(12,20);

System.out.println(a.h(100));

}

}

3.

interfaceA{

publicabstractvoidf(intx);

publicabstractvoidg(intx,inty);

publicabstractdoubleh(doublex);

}

classA1implementsA{

publicvoidf(intx){

System.out.println(x);

}

publicvoidg(intx,inty){

intz=x+y;

System.out.println(z);

}

publicdoubleh(doublex){

returnx*x;

}

}

classA2implementsA{

publicvoidf(intx){

System.out.println("Hello:

"+x);

}

publicvoidg(intx,inty){

intz=x-y;

System.out.println(z);

}

publicdoubleh(doublex){

returnMath.sqrt(x);

}

}

classA3implementsA{

publicvoidf(intx){

System.out.println("你好:

"+x);

}

publicvoidg(intx,inty){

doublez=(double)x/y;

System.out.println(z);

}

publicdoubleh(doublex){

return1/x;

}

}

publicclassZuoYe5_3{

publicstaticvoidmain(Stringargs[]){

Aa=newA1();

a.f(10);

a.g(12,20);

System.out.println(a.h(100));

a=newA2();

a.f(10);

a.g(12,20);

System.out.println(a.h(100));

a=newA3();

a.f(10);

a.g(12,20);

System.out.println(a.h(100));

}

}

4.

classCubic

{doublegetCubic(intn)

{return0;

}

}

abstractclassSqrt

{publicabstractdoublegetSqrt(intx);

}

classA

{voidf(Cubiccubic)

{doubleresult=cubic.getCubic(3);

System.out.println(result);

}

}

publicclassZuoYe5_4

{publicstaticvoidmain(Stringargs[])

{Aa=newA();

a.f(newCubic()

{doublegetCubic(intn)

{returnn*n*n;

}

}

);

Sqrtss=newSqrt()

{publicdoublegetSqrt(intx)

{returnMath.sqrt(x);

}

};

doublem=ss.getSqrt(5);

System.out.println(m);

}

}

5.

classIntegerExceptionextendsException

{Stringmessage;

IntegerException(intm)

{message="年龄"+m+"不合理";

}

publicStringtoString()

{returnmessage;

}

}

classPeople

{privateintage=1;

publicvoidsetAge(intage)throwsIntegerException

{

if(age>=160||age<=0)

thrownewIntegerException(age);//方法抛出异常,导致方法结束

else

this.age=age;

}

publicintgetAge()

{System.out.println("年龄"+age+"合理");

returnage;

}

}

publicclassZuoYe6_5

{publicstaticvoidmain(Stringargs[])

{Peoplewang=newPeople(),

zhang=newPeople();

try{wang.setAge(189);

System.out.println(wang.getAge());

}

catch(IntegerExceptione)

{System.out.println(e.toString());

}

try{zhang.setAge(28);

System.out.println(zhang.getAge());

}

catch(IntegerExceptione)

{System.out.println(e.toString());

}

}

}

第六章作业题

1.

importjava.util.regex.*;

importjava.util.*;

publicclassZuoYe6_1{

publicstaticvoidmain(Stringargs[]){

Scannerreader=newScanner(System.in);

Strings1=reader.nextLine();

Patternp;

Matcherm;

p=Ppile("[24680]A[13579]{2}");

m=p.matcher(s1);

while(m.find()){

Stringstr=m.group();

System.out.print("从"+m.start()+"到"+m.end()+"匹配模式子序列:

");

System.out.println(str);

}

}

}

2.

importjava.util.regex.*;

importjava.util.*;

publicclassZuoYe4_1{

publicstaticvoidmain(Stringargs[]){

Scannerreader=newScanner(System.in);

Strings1=reader.nextLine();

Patternp;

Matcherm;

p=Ppile("\\d+");

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