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第一章1.publicclassBegintoLearn{publicstaticvoidmainStringargs[]{}}2.publicclassTraStar{publicstaticvoidmainStringargs[]{*;**;***;****;*****;}}第二章1.publicclassProNum{publicstaticvoidmainStringargs[]{floatp;longq;intm=10n=5;m=m+3;n=n+5;p=floatm+n/2;q=m*m*n*n;}}2.classSphereClass{publicstaticvoidmainStringargs[]{intr=3;doublev;v=
3.14*r*r*r*4/3;}}第三章
1.publicclassInNum{publicstaticvoidmainStringargs[]throwsIOException{intnum1num2;Stringstr;BufferedReaderbuf;buf=newBufferedReadernewInputStreamReaderSystem.in;str=buf.readLine;num1=Integer.parseIntstr;str=buf.readLine;num2=Integer.parseIntstr;}}2.publicclassGrade{publicstaticvoidmainStringargs[]throwsIOException{intscore;charch;Stringstr;BufferedReaderbuf;buf=newBufferedReadernewInputStreamReaderSystem.in;str=buf.readLine;score=Integer.parseIntstr;ifscore=90ch=A;elseifscore=75ch=B;elseifscore=60ch=C;elsech=D;}}3.publicclassShuLie{publicstaticvoidmainStringargs[]{intaqn;q=150-135/5;a=135-20*q/5;forn=0;n10;n++}}4.publicclassPyramid{publicstaticvoidmainStringargs[]{intijk;fori=0;i=4;i++{forj=0;j20-i;j++fork=0;k=2*i;k++ifk=ielse}}}5.publicclassPrimeNumber{publicstaticvoidmainStringargs[]throwsIOException{intn=0;intm;Stringstr;booleanmark=false;BufferedReaderbuf;buf=newBufferedReadernewInputStreamReaderSystem.in;str=buf.readLine;m=Integer.parseIntstr;forinti=3;i=m;i+=2{forintj=2;ji;j++{ifi%j==0{mark=true;break;}}if!mark{n++;//outputanewlineifn%10==0//after10numbers}mark=false;}}}6.publicclassFactor12{publicstaticvoidmainStringargs[]throwsIOException{intm;Stringstr;BufferedReaderbuf;buf=newBufferedReadernewInputStreamReaderSystem.in;str=buf.readLine;m=Integer.parseIntstr;forinti=1;i=m;i++ifm%i==0}}7.publicclassMSteel{publicstaticvoidmainStringargs[]{intd=0;floatm=2000;whilem=5{m=m/2;d++;}}}8.publicclassAlmostPi{publicstaticvoidmainStringargs[]{intn;longm;doublest;n=1;m=0;s=0;do{t=doublen/2*m+1;m++;n=-n;s=s+t;}while4*s-
3.
141590.0000001||4*s-
3.14159-
0.0000001;}}
9.publicclassLSRnd{publicstaticvoidmainStringargs[]{intmunnmax1min1;max1=0;min1=100;forn=1;n=10;n++{mun=int100*Math.random;ifmunmax1max1=mun;ifmunmin1min1=mun;}}}
10.publicclassStrArry{publicstaticvoidmainStringargs[]throwsIOException{intm;Stringstr;Stringmonth[]={JanuaryFebruaryMarchAprilMayJuneJulyAugustseptemberOctoberNovemberDecember};BufferedReaderbuf;buf=newBufferedReadernewInputStreamReaderSystem.in;str=buf.readLine;m=Integer.parseIntstr;ifm=1m=12else}}第四章1.publicclassPerson{privateStringname;privatecharsex;privateintyearmonth;publicPerson{}publicPersonStringnmcharsxintyintm{name=nm;sex=sx;year=y;month=m;}publicvoidprintPerson{Calendarnow=Calendar.getInstance;intage=now.getCalendar.YEAR-year;}publicstaticvoidmainStringargs[]{Personpe1=newPersonTomm198010;pe
1.printPerson;}}2.publicclassRectangle{doublewidthlengthgirtharea;publicRectangle{};publicRectangledoublewddoublele{width=wd;length=le;}publicvoidsetWidthdoublewd{width=wd;}publicvoidsetLengthdoublele{length=le;}publicdoublegetWidth{returnwidth;}publicdoublegetLength{returnlength;}publicdoublegirth{return2*width+length;}publicdoublearea{returnwidth*length;}publicvoidprintRectangle{}publicstaticvoidmainStringargs[]{Rectanglere1=newRectangle1020;Rectanglere2=newRectangle;re
2.setWidth3;re
2.setLength4;re
1.printRectangle;re
2.printRectangle;}}3.publicclassMatrix{privateintmx[][]mn;publicMatrixintrintc{m=r;n=c;mx=newint[m][n];iniMatrix;}publicMatrix{m=3;n=3;mx=newint
[3]
[3];iniMatrix;}publicvoidiniMatrix{intij;fori=0;i=m-1;i++forj=0;j=n-1;j++mx[i][j]=intMath.random*100;}publicvoidtranMatrix{intijt;intmt[][]=newint[m][n];fori=0;i=m-1;i++forj=0;j=n-1;j++mt[i][j]=mx[i][j];t=m;m=n;n=t;mx=newint[m][n];fori=0;i=m-1;i++forj=0;j=n-1;j++mx[i][j]=mt[j][i];}publicvoidprintMatrix{intij;fori=0;i=m-1;i++{forj=0;j=n-1;j++}}publicvoidaddMatrixMatrixb{intij;fori=0;i=m-1;i++forj=0;j=n-1;j++mx[i][j]=mx[i][j]+b.mx[i][j];}publicstaticvoidmainStringargs[]{Matrixma=newMatrix43;Matrixmb=newMatrix43;ma.printMatrix;mb.printMatrix;ma.addMatrixmb;ma.printMatrix;mb.tranMatrix;mb.printMatrix;}}4.publicclassSubstring{publicstaticvoidmainStringargs[]{Stringstr1=newStringaddActionListener;Stringstr2=newStringAction;intn;n=str
1.indexOfstr2;ifn=0{}}}
五、写出程序运行后的结果1.
2.。