面向对象程序设计java程序设计课后习题答案

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1、第一章1．publicclassBegintoLearn{publicstaticvoidmain(Stringargs[]){System.out.println("I’dliketostudyJava!");}}2．publicclassTraStar{publicstaticvoidmain(Stringargs[]){System.out.println("*");System.out.println("**");System.out.println("***");System.out.println("****");System.out

2、.println("*****");}}第二章1．publicclassProNum{publicstaticvoidmain(Stringargs[]){floatp;longq;intm=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．classS

3、phereClass{publicstaticvoidmain(Stringargs[]){intr=3;doublev;v=3.14*r*r*r*4/3;System.out.println("V="+v)}}第三章1.importjava.io.*;publicclassInNum{publicstaticvoidmain(Stringargs[])throwsIOException{intnum1,num2;Stringstr;BufferedReaderbuf;buf=newBufferedReader(newInputStreamRea

4、der(System.in));System.out.print("Inputfirstinteger:");str=buf.readLine();num1=Integer.parseInt(str);System.out.print("Inputsecondinteger:");str=buf.readLine();num2=Integer.parseInt(str);System.out.println("Thesumis"+(num1+num2));}}2．importjava.io.*;publicclassGrade{publicsta

5、ticvoidmain(Stringargs[])throwsIOException{intscore;charch;Stringstr;BufferedReaderbuf;buf=newBufferedReader(newInputStreamReader(System.in));System.out.print("Inputthescore(0-100):");str=buf.readLine();score=Integer.parseInt(str);if(score>=90)ch='A';elseif(score>=75)ch='B';e

6、lseif(score>=60)ch='C';elsech='D';System.out.print("TheGradeis"+ch);}}3．publicclassShuLie{publicstaticvoidmain(Stringargs[]){inta,q,n;q=(150-135)/5;a=(135-20*q)/5;for(n=0;n<10;n++)System.out.print((a+n*q)+"");}}2．publicclassPyramid{publicstaticvoidmain(Stringargs[]){inti,j,k;

7、for(i=0;i<=4;i++){for(j=0;j<20-i;j++)System.out.print("");for(k=0;k<=2*i;k++)if(k<=i)System.out.print(""+(2*k+1));elseSystem.out.print(""+(2*(2*i-k)+1));System.out.println();}}}3．importjava.io.*;publicclassPrimeNumber{publicstaticvoidmain(Stringargs[])throwsIOException{intn=0

8、;intm;Stringstr;booleanmark=false;BufferedReaderbuf;buf=newBufferedR