java程序设计教程(第六版)课后习题答案

java程序设计教程（第六版）课后习题答案pp2.3publicclassfudian{publicstaticvoidmain(String[]args){floata=2.10f,b=3.70f;floatResult1,Result2,Result3;Result1=a+b;Result2=a-b;Result3=a*b;System.out.println(\System.out.println(\System.out.println(\}}2.4publicclassTempConverter{publicstaticvoidmain(String[]args){finalintBASE=32;finaldoubleCONVERSION_FACTOR=5.0/9.0;doublecelsiusTemp;convertintfahrenheitTemp=70;//valuetocelsiusTemp=(fahrenheitTemp-BASE)*CONVERSION_FACTOR;System.out.println(\System.out.println(\}}2.5publicclassyinglizhuanqianmi{publicstaticvoidmain(String[]args){floatBase=1.60935f;floatQianmi;floatYingli=19.85f;Qianmi=Yingli*Base;System.out.println(\System.out.println(\}}2.6第1页共6页

publicclassTimeConverter1{publicstaticvoidmain(String[]args){intHour=5,Minute=35,Second=51;intSECONDS;SECONDS=Hour*60*60+Minute*60+Second;System.out.println(+Hour+\时\分\秒\System.out.println(\换算成秒:\}}2.7publicclassTimeConverter2{publicstaticvoidmain(String[]args){intSECONDS=10853;intHour,Minute,Second;Second=SECONDS`;Minute=(SECONDS-Second)`;Hour=(SECONDS-Second-Minute*60)/3600;System.out.println(SECONDS+\秒，转化为\System.out.println(Hour+\时\分\秒\}}2.9importjava.util.*;publicclassDollarbill{publicstaticvoidmain(String[]args){floatDollar1,Dollar2;intTen,Five,One,Quarters,Dimes,Nickles,Pennies;Scannerreader=newScanner(System.in);System.out.println(\输入币值：\Dollar1=reader.nextFloat();Pennies=(int)Dollar2%5;Dollar2=Dollar1*100;Nickles=((int)Dollar2-Pennies)/5;第2页共6页

Dimes=((int)Dollar2-Pennies-Nickles*5)P/10;Quarters=(int)Dollar20/50;One=((int)Dollar2-Pennies-Nickles*5-Dimes*10-Quarters*50)P0/100;Five=(int)Dollar200/500;Ten=(int)Dollar2/1000;System.out.println(Ten+\System.out.println(Five+\System.out.println(One+\System.out.println(Quarters+\System.out.println(Dimes+\System.out.println(Nickles+\System.out.println(Pennies+\！\}}2.11importjava.util.*;publicclassFenshuzhuanhuan{publicstaticvoidmain(String[]args){intx,y;doubleResult=0;Scannerreader=newScanner(System.in);System.out.println(\输入x：\x=reader.nextInt();System.out.println(\输入y：\y=reader.nextInt();Result+=x/y;System.out.println(\分数\System.out.println(\转换成小数是:\}}2.16importjavax.swing.JApplet;importjava.awt.*;第3页共6页

publicclassOlympiclogoextendsJApplet{publicvoidpaint(Graphicspage){page.setColor(Color.blue);page.drawOval(25,65,40,40);page.setColor(Color.yellow);page.drawOval(55,65,40,40);page.setColor(Color.black);page.drawOval(85,65,40,40);page.setColor(Color.green);page.drawOval(115,65,40,40);page.setColor(Color.red);page.drawOval(145,65,40,40);//circlepage.setColor(Color.cyan);page.drawString(\YMPICLOGO\}}2.19importjava.applet.*;importjava.awt.*;publicclassEx2_19extendsApplet{publicvoidpaint(Graphicspage){page.setColor(Color.BLACK);page.setFont(newFont(\楷体\page.drawString(\林少锋\page.setColor(Color.blue);page.setFont(newFont(\宋体\page.drawString(\林少锋\}}2.20importjava.applet.*;importjava.awt.*;publicclassEx2_20extendsApplet{publicvoidpaint(Graphicspage){page.drawOval(35,35,130,130);page.setColor(Color.red);page.fillArc(35,35,130,130,0,45);page.setColor(Color.blue);page.fillArc(35,第4页共6页

35,130,130,45,45);page.setColor(Color.yellow);page.fillArc(35,35,130,130,90,45);page.setColor(Color.cyan);page.fillArc(35,35,130,130,135,45);page.setColor(Color.gray);page.fillArc(35,35,130,130,180,45);page.setColor(Color.green);page.fillArc(35,35,130,130,225,45);page.setColor(Color.darkGray);page.fillArc(35,35,130,130,270,45);page.setColor(Color.pink);page.fillArc(35,35,130,130,315,45);}}PP4.1方法1importjava.util.*;publicclassCreateSphere{/***@paramargs*/publicstaticvoidmain(String[]args){//TODO自动生成方法存根System.out.println(\请输入直径d：\Scannerscan=newScanner(System.in);doubled=scan.nextDouble();SphereD=newSphere(d);D.Square();D.Volum();System.out.println(D.toString());}}第5页共6页

publicclassSphere{finaldoublePI=3.14;doubleV,S;doubled;Sphere(doubled){this.d=d;}publicvoidVolum(){V=(4/3)*PI*(d/2)*(d/2)*(d/2);}publicvoidSquare(){S=4