1、 System.out.println (Ying Li: + Yingli);Qian Mi: +Qianmi);2.6public class TimeConverter1 int Hour=5,Minute=35,Second=51; int SECONDS; SECONDS=Hour*60*60+Minute*60+Second; System.out.println (+Hour+时+Minute+分+Second+秒);换算成秒: + SECONDS);2.7public class TimeConverter2 int SECONDS=10853; int Hour,Minute
2、,Second; Second=SECONDS%60; Minute=(SECONDS-Second)%60; Hour=(SECONDS-Second-Minute*60)/3600; System.out.println (SECONDS+秒,转化为 System.out.println (Hour+2.9import java.util.*;public class Dollarbill float Dollar1,Dollar2; int Ten,Five,One,Quarters,Dimes,Nickles,Pennies; Scanner reader=new Scanner(Sy
3、stem.in);输入币值: Dollar1=reader.nextFloat(); Dollar2=Dollar1*100; Pennies= (int)Dollar2%5; Nickles=(int)Dollar2%10-Pennies)/5; Dimes=(int)Dollar2-Pennies-Nickles*5)%50/10; Quarters=(int)Dollar2%100/50; One=(int)Dollar2- Pennies-Nickles*5-Dimes*10-Quarters*50)%500/100; Five=(int)Dollar2%1000/500; Ten=(
4、int)Dollar2/1000; System.out.println(Ten+ ten dollar bills System.out.println(Five+ five dollar bills System.out.println(One+ one dollar bills System.out.println(Quarters+ quarters dollar bills System.out.println(Dimes+ dimes dollar bills System.out.println(Nickles+ nickles dollar bills System.out.p
5、rintln(Pennies+ pennies dollar bills!2.11public class Fenshuzhuanhuan int x,y; double Result=0;输入x: x=reader.nextInt();输入y: y=reader.nextInt(); Result+=x/y;分数 +x+/+y);转换成小数是: + Result);2.16import javax.swing.JApplet;import java.awt.*;public class Olympiclogo extends JApplet public void paint (Graphi
6、cs page) 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, 4
7、0, 40);/ circle page.setColor(Color.cyan); page.drawString (OLYMPIC LOGO, 40, 30); 2.19import java.applet.*;public class Ex2_19 extends Applet public void paint (Graphics page) page.setColor(Color.BLACK); page.setFont(new Font(楷体,Font.ITALIC+Font.BOLD,30); page.drawString (林少锋 page.setColor(Color.bl
8、ue);宋体,Font.BOLD,30);, 70, 80); 2.20public class Ex2_20 extends Applet page.drawOval(35, 35, 130, 130); page.setColor(Color.red); page.fillArc(35, 35, 130, 130,0,45); page.fillArc(35, 35, 130, 130,45,45); page.setColor(Color.yellow); page.fillArc(35, 35, 130, 130,90,45); page.setColor(Color.cyan); p
9、age.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, 130,31
10、5,45);PP4.1方法1public class CreateSphere /* * param args */ / TODO 自动生成方法存根 System.out.println(请输入直径d: Scanner scan=new Scanner(System.in); double d=scan.nextDouble(); Sphere D=new Sphere(d); D.Square(); D.Volum(); System.out.println(D.toString();public class Sphere final double PI=3.14; double V,S;
11、double d; Sphere(double d) this.d=d; public void Volum() V=(4/3)*PI*(d/2)*(d/2)*(d/2); public void Square() S=4*PI*(d/2)*(d/2); public String toString() String s=; String result1=Double.toString(S); String result2=Double.toString(V); s=(体积为:+result2+面积为:+result1); return s;方法2/Sphere.java public cla
12、ss Sphere private double diameter; public Sphere()/构造方法:无参数 this.diameter = 1.0; public Sphere(double d) /构造方法:带一个参数 this.diameter = d; public void setDiameter(double d) /设置直径值的方法 public double getDiameter()/获取直径值的方法 return this.diameter; public double volume()/计算球的体积 return 4*Math.PI*Math.pow(this.
13、diameter/2,3)/3; public double area()/计算球的表面积 return 4*Math.PI*Math.pow(this.diameter/2,2); String out = 该球体的直径为: + this.diameter + n + 该球体的表面积为: + this.area() + +该球体的体积为: + this. volume(); return out;/MultiSphere.javaimport java.util.Scanner;public class MultiSphere public static void main(String a
14、rgs) Scanner scan = new Scanner(System.in); Sphere sphere1 = new Sphere(); Sphere sphere2 = new Sphere(3.5);sphere1: + sphere1 + sphere2: + sphere2 + sphere1和sphere2分别调用无参构造方法和带一个参数的构造方法进行初始化。 System.out.print(现在,请输入一个数作为球sphere1的直径值: sphere1.setDiameter(scan.nextDouble();更改过的sphere1: + sphere1);/PP
15、 4.2public class CreateDog 请输入狗的年龄age: int age=scan.nextInt();请输入狗的姓名name: Scanner scan1=new Scanner(System.in); String name=scan1.next(); Kennel AGE=new Kennel(age); AGE.Age(); System.out.println(AGE.toString();狗的名字是: +name);public class Kennel final int mul=7; int age; int agep; char name; Kennel(
16、int age) this.age=age; this.name=name; public void Age() agep=age*mul; String r1=Integer.toString(age); String r2=Integer.toString(agep);狗的年龄为:+r1+ 对应人的年龄为:+r2);class Dog1 String name; public Dog1() name=heizi age=1; public Dog1(String n, int a ) name=n; age=a; public int DogAge(int Age) int age=Age
17、/7; return(age); public void setName(String name1) name=name1; public String getName() return(name); public String toString() Dog1 d=new Dog1(); return(这只狗叫+d.name+已经有+d.age+岁了。 public class Kennel Dog1 dog1=new Dog1();dog1的 name=+dog1.name);dog1的 age=+dog1.age); Dog1 dog2=new Dog1(xiaobai,2);dog2的
18、name=+dog2.name);dog2的age=+dog2.age); dog1.setName(diandian dog1.getName(); int age=dog1.DogAge(35);age=+age); String r=dog1.toString();r=+r); PP 4.4public class Book String info = null; Bookshelf book; Bookshelf INFO=new Bookshelf(info); INFO.BOOK(); System.out.println(INFO.toString();public class
19、Bookshelf String bookname; String author; String publish; String date; String books; String info; public Bookshelf(String info) bookname=JAVA author=qwe publish=Tsing HUA date=19890322 this.info=info; public String BOOK() info=bookname+author+publish+date; return info; String bookinfo; bookinfo=书名:+
20、bookname+ 作者:+author+ bookinfo+=出版社:+publish+出版日期:+date; return bookinfo;class Book String title,author,publisher,copyright; Book() title=JAVA 编程语言设计John Lewis publisher=电子工业出版社 copyright=xuesheng Book(String t,String a,String p,String c) title= t; author=a; publisher=p; copyright=c; void setBook(String t1,String a1,String p1,String c1) title= t1; author=a1; publisher=p1; copyright=c1; String getBookTitle() return(title); String getBookAuthor() return(author); String getBookPublisher() return(publisher); String getBookCopyright()
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