java题目例题

1、利用随机函数定义10对任y)值，由此创建的Point类实例存入一个数组中，按与原点(0,0)的距离由小到人的顺序输出所有的点及到原点的距离。【参考程序】publicclasspointprivateintx,privateinty,privatedoubledie,publicpointOOpublicpoint(intxl,intyl)this.x=xl,this.y=yl,publicvoiddistanceOdoubletemp=Math.pow(tliis.x,2)+Matlipow(tlns.y,2),this.dic=Matlisqrt(temp);publicstaticvoid

2、main(Stringargs)points=newpoint10”for(inti=0,i10,1+)mtx,y,si=nevzpoint(x=(int)(Math.randomO*10),y=(int)(Math.randomO*10),si.distanceO,output(s),for(inti=0,i9,i+)for(intj=i+1,jsjdic)pointtemp=si,si=sj,sj=temp,System,outpnntlnO,output(s),staticvoidoutput(points)for(inti=0,ic&abc)doublep=(a+b+c)/2;doub

3、leans=p*(p-a)*(pb)*(pc);area=Math.sqrt(ans);elsedoubletempMathmin(a,b);temp=Math.min(ten,c);area=(ten5?*tenip*(Math,sqrt(3)/4;publicstaticvoidmain(St:ringargs)trySystem,out.printInC输入三个实数：)；BufferedReaderbr=newBufferedReader(newInputStreamReader(Systentin);Strings=brreadLine();doublex二DoubleparsEDou

4、ble(s);Stringq=brreadLine();doubley二DoubleparsEDouble(q);Stringw=brreadLine();doublez=DoubleparsEDouble(w);triangleans=newtriangle(x?y,z);Systentout.printIn(/?a=，+x+b二+y+，c二+z);anstrianglearea0;Systern.out.printIn(ansarea);catch(IOExceptione)1)编程根据一个已存在的链表创建一个倒序链表。利用如卜方法实现一个链表的倒序。staticLinkreverse(L

5、inklist)Linkrev=null;Linkrunner=list;vdiile(runner!=null)LinkneIode=newLink;newNodedata=runnerdata;newNodenxt二rev;rev=newNode;runner=runnernext;returnrev;)【参考程序】classNodemtdata;/存放数据；Nodenext,存放卜一个节点；publicclassLinkNodeheader,publicLmk：0/构造无参数的构造方法；构造带参数的构造方法，构造新的链表：publicLink(intn)Nodep,q,定义头节点；hea

6、der=newNodeO,headei:data=(int)(MathrandomO*l00),使p指向头节点；p=header,for(intk=l,k;if(p!=iull)Systemoutprint(-),System.out.printlnO,publicstaticvoidmain(Shingargs)Linkx=iewLink(l0),输出原链表；x.outputLinkO,Linky=null,/System.out.pnntlnC*)y=x.reveise(x),输出原链表的倒叙的琏表；youtputLinkO,k*I设有一个由10个英文单词构成的字符串数组，要求：统计以字母

7、w开头的单词数；统计单词中含“or”字符串的单词数；统计长度为3的单词数。*/importjavaio.*,publicclassCountpublicstaticStringmputQthrowsIOExceptionBufferedReaderbievzBufferedReader(nev/InputSheamReadeiSystem.in),Strings=newString10,for(inti=O,isi=br.readLineO,returns,publicstaticintcountW(Shings)intcount=0,for(inti=O,is.lengtli,i+)if(s

8、i,charAt(0)=,w,)count+;returncount,publicstaticintcountOr(Shnngs)intcount=0,for(inti=O,is.lengtli,i+)if(si.contains(or1)count+,returncount,publicstaticintcounts(Stiings)intcount=0,for(inti=O,i(2)输入一个算术表达式，例如：45*2+23*(234-24),求出其中有多少整数常数。importjavaio.*,publicclassbiaodashipublicstaticStringinput。thro

9、wsIOExceptionBufferedReaderbiFewBufferedReader(nevzInputStreamReader(Systemin),Stringsi;Systemout.printlnC请输入一个算术表达式s=br.readLineOreturns,publicstaticintcountInt(Stnngs)intcount=0,charch;获取串中的单个字符ch=s.charAt(O),/if(Chaiacter.isDigit(ch)/count=lbooleanflag=false;标记当前字符是否为数字for(inti=0,ivzidth20,heigli

10、t20)g.drawOval(x,y,v/idth,height),x+=l0,y+=io；if(width10)break,(3)棋盘oooooooimportjavaawt.*”importjavaapplet.*,publicclasscheckboardextendsAppletpublicvoidpaint(Graphicsg)introvz,col,intx,y,white,black,fdr(rovz=0,rovzl9,row+)for(col=0,col/orange=(uit)Math.floor(L4atli.random0*256),/pink=(int)Matli.fl

11、oor(Matliiandom()*256),x=col*20,y=qov/*20,g.setColoi(newColor(vzhite,black,white,black),g.fillRect(x,y,20,20),*4)利用鼠标事件实现一个拉橡皮筋方式绘制直线的程序。鼠标按卜开始算始点，拖动鼠标至*终点，在始点和终点之间绘制直线，在拖动鼠标的过程中，总在始点和鼠标位置绘制直线，*但只有最后释放鼠标时直线为最终需要的直线。*/importjavaav/t.*,importjavaav/t.event.*,SuppressWamings(serial11)publicclassDrawLin

12、eextendsFrameintx,y,记住鼠标开始pressed时的坐标位置！intposx,posy,publicDrawLineO/TODOAuto-geneiatedconstructorstubthis.addMouseListeneinewMouseAdapterOOvemdepublicvoidmousePiessed(MouseEvente)/TODOAuto-geneiatedmetliodstubx=e.getX0,Y=egetYO,OvemdepublicvoidmouseReleased(MouseEvente)/TODOAuto-geneiatedmetliodstu

13、bposx=egetXO,posy=egetYO,repaintO,),this.addMouseMotionListenei(newMouseMotionAdapterOpublicvoidmouseDragged(MouseEvente)posx=egetXO,posy=egetYO,repaintO,),this.addWindov/ListeneiCnevzWuidowAdapteiOpublicvoidv/indov/Closing(WindowEvente)dispose。”),setsize(500,400);setVisible(tme),publicvoidpaint(Gia

14、phicsg)g.setColor(Color.red),/gdrav/Line(lastx,lasty,posx,posy);g.drawLine(x,y,posx,posy),*paramargs*/publicstaticvoidmain(Stringargs)/TODOAuto-geneiatedmetliodstubnevzDrawLineO,/*1)输入若干行文本，以end作为结束行，统计该文本由多少行组成，字符总数，有多少*“the”，将整个文本中所有单词首字母为小写的改为人写输出。*/irnportjavaio.*,importjavautil.*,publicclassEnd

15、privateint1me,charCount,countThe,privateShingBuffersb,privateVectorv,privateVectorvsb,publicEndOsbnewStiingBufferO,v=newVector0vsb=nevzVector0publicvoidinputOthrowsIOExceptionStringsi;Systemout.println(请输入若干行文本，以end作为结束彳亍:)，BufferedReaderbievzBufferedReader(nevzInputStreamReader(Systemin),s=br.readL

16、ineOwhileGsequalsCend-)addCs),ShingBufferssb=newStringBuffer(s),vsb.add(ssb),s+line+,sb.append(s),s=br.readLineOpublicvoidcountOfor(inti=0,iStringsH11;for(intj=O,js.length,j+)if(sj.contains(Hthe11)countThe+,ss+=sj);charCount+=sslengthO,publicvoidtranslateOfor(inti=O,irepainto,/*2)通过Applet参数提供两个间距在10

17、0以内的整数，找出这两个整数Z间的所有素数,*按每行5个在Applet画面上输出。*/importjavaapplet.*,importjavaavzt.*,SuppressWamings(serial11)publicclassPiimeNumberextendsAppletinta=100,b=3,/100以内的整数intx=l0,y=l0,/坐标位置publicvoidpaint(Giaphicsg)intcount=l,for(inti=b,i=a,i+)mtj=2;for(,j(L4atlisqit(i)g.drawString(,IB+i,x,y),if(count%5=0)x=1

18、0,换行y+WO,/lfif(count%5!=O)x+=20,count+,/if/for创建带有标签和文本域的窗体。当用户在文本域中输入其姓名后，显示欢迎用户使用java编程的消息。例如用户输入姓名flyhorse,则显示消息“你好，flyhorse,欢迎你使用java编程！”，并能正常关闭窗II。【参考程序】importjavaawt*;importjavaawt.event*;classcloseWin已xtendsWindowAdapterpublicvoidwindowClosing(WindowEvente)Windoww=e.getWindow();w.dispose0;publicclassmyFramelextendsFrameiniplementsActionListenetLabelwelcome;TextFieldinput