JAVA大学实用教程第二版习题解答最新完整版.docx
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JAVA大学实用教程第二版习题解答最新完整版.docx
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JAVA大学实用教程第二版习题解答最新完整版
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+"); m=p.match
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