面向对象程序设计JAVA程序设计课后习题答案.doc

第一章1public class BegintoLearn public static void main(String args) System.out.println(Id like to study Java ! ); 2 public class TraStar public static void main(String args) System.out.println(*);System.out.println(* *);System.out.println(* * *);System.out.println(* * * *);System.out.println(* * * * *); 第二章1public class ProNum public static void main(String args) float p; long q; int m=10,n=5; System.out.println(m=+m+ n=+n); m=m+3;n=n+5; System.out.println(m=+m+ n=+n); p=(float)(m+n)/2; System.out.println(p=+p); q=(m*m*n*n); System.out.println(q=+q); 2 class SphereClass public static void main(String args) int r=3; double v; v=3.14*r*r*r*4/3; System.out.println(V=+v) 第三章1. import java.io.*;public class InNum public static void main(String args) throws IOException int num1,num2; String str; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print(Input first integer:); str=buf.readLine(); num1=Integer.parseInt(str); System.out.print(Input second integer:); str=buf.readLine(); num2=Integer.parseInt(str); System.out.println(The sum is +(num1+num2); 2import java.io.*;public class Grade public static void main(String args) throws IOException int score; char ch; String str; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print(Input the score(0-100):); str=buf.readLine(); score=Integer.parseInt(str); if (score=90) ch=A; else if (score=75) ch=B; else if (score=60) ch=C; else ch=D; System.out.print(The Grade is +ch); 3public class ShuLie public static void main(String args) int a ,q ,n; q=(150-135)/5; a=(135-20*q)/5; for (n=0;n10;n+) System.out.print(a+n*q)+ ); 4public class Pyramid public static void main(String args) int i,j,k; for(i=0;i=4;i+) for ( j=0;j20-i;j+) System.out.print( ); for (k=0;k=2*i;k+) if (k=i) System.out.print( +(2*k+1); else System.out.print( +(2*(2*i-k)+1); System.out.println(); 5import java.io.*;public class PrimeNumber public static void main(String args) throws IOException int n=0; int m; String str; boolean mark=false; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print(Input the m:); str=buf.readLine(); m=Integer.parseInt(str); for(int i=3;i=m;i+=2) for(int j=2;ji;j+) if(i%j=0) mark=true; break; if (!mark) System.out.print( +i); n+; /outputanewline if(n%10=0) /after10numbers System.out.println(); mark=false; System.out.println(); 6import java.io.*;public class Factor12 public static void main(String args) throws IOException int m; String str; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print(Input the m:); str=buf.readLine(); m=Integer.parseInt(str); System.out.print(m+s factors are: ); System.out.println( ); for(int i=1;i=5) m=m/2; d+; System.out.print(d+: ); System.out.println(m); System.out.print(You need +d+ days); 8public class AlmostPi public static void main(String args) int n; long m; double s,t; n=1; m=0; s=0; do t=(double)n/(2*m+1); m+; n=-n; s=s+t; while (4*s-3.14159 0.0000001 | 4*s-3.14159 -0.0000001); System.out.println(m); 9.public class LSRnd public static void main(String args) int mun,n,max1,min1; max1=0; min1=100; for (n=1;nmax1) max1=mun; if (mun=1 & m=12) System.out.println(monthm-1); else System.out.print(Your Input is wrong); 第四章1import java.util.*;public class Personprivate String name; private char sex; private int year,month;public Person( )public Person(String nm,char sx,int y,int m) name=nm; sex=sx; year=y;month=m;public void printPerson( ) Calendar now=Calendar.getInstance();int age=now.get(Calendar.YEAR)-year;System.out.println(Name: +name+,Sex: +sex+, Age: +age);public static void main(String args)Person pe1=new Person(Tom,m,1980,10);pe1.printPerson();2public class Rectangledouble width,length,girth,area; public Rectangle(); public Rectangle(double wd,double le) width=wd;length=le; public void setWidth(double wd) width=wd; public void setLength(double le) length=le; public double getWidth( ) return width; public double getLength( ) return length; public double girth()return 2*(width+length); public double area()return width*length; public void printRectangle()System.out.println(Width=+width+ ,Length=+length); public static void main(String args) Rectangle re1=new Rectangle(10,20); Rectangle re2=new Rectangle(); re2.setWidth(3); re2.setLength(4); re1.printRectangle(); System.out.println(Girth=+re1.girth()+,Area=+re1.area(); re2.printRectangle();System.out.println(Girth=+re2.girth()+,Area=+re2.area();3public class Matrixprivate int mx,m,n; public Matrix(int r,int c) m=r; n=c; mx=new intmn; iniMatrix(); public Matrix() m=3; n=3; mx=new int33;iniMatrix();public void iniMatrix()int i,j; for(i=0;i=m-1;i+) for(j=0;j=n-1;j+) mxij=(int)(Math.random()*100);public void tranMatrix()int i,j,t; int mt=new intmn; for(i=0;i=m-1;i+) for(j=0;j=n-1;j+) mtij=mxij; t=m; m=n; n=t; mx=new intmn; for(i=0;i=m-1;i+) for(j=0;j=n-1;j+) mxij=mtji; public void printMatrix()int i,j;for(i=0;i=m-1;i+) for(j=0;j=n-1;j+) System.out.print( +mxij);System.out.println(); public void addMatrix(Mat