java程序复习题.doc

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1、1./程序China.java:public class China public static void main(String args) man zhangsan=new man(); zhangsan.say(); class man void say() System.out.println() 2/CopyFile.javaimport java.io.*; class CopyFile public static void main(String args) throws IOException int i; FileInputStream fin; FileOutputStre

2、am fout; fin=new FileInputStream(myfile.txt); fout=new FileOutputStream(yourfile.txt); Do i=fin.read(); if(i!=-1) fout.write(i); while(i!=-1); fin.close(); fout.close(); System.out.println(myfile.txt内容已被复制到yourfile.txt文件中); 3.class Avoid f() int u=(int)(Math.random()*100); int v=0 ,p; if (u50) v=9;

3、p=v+u;4./App.javaclass Person private String name;private int age;/定义一个私有整型属性agepublic Person(String name, int age)this.name=name;this.age=age;public void show( )System.out.println(姓名：+name+年龄+age); public class App public static void main(String args) Person per;per=new Person1;per0=new Person(张三,1

4、9);per0.show(); 5./App.javaclass Person String name;private int age;/定义一个私有整型属性agepublic int getAge( )return age;/返回age属性public void setAge(int age)if(age=5&age=5&age=5&s1.getAge()=20)System.out.println(s1.name+的年龄是：+s1.getAge();elseSystem.out.println(年龄错误); 7.public class App9_1 public static void

5、main(String args) int i; int a=1,2,3,4; for(i=0;i5;i+) System.out.println( a+i+=+ai); System.out.println(5/0+(5/0); 8.public class App9_2 public static void main(String args) int i; int a=1,2,3,4; for(i=0;i5;i+) try System.out.println( a+i+=+ai); catch() System.out.println(5/0+(5/0); 9/C1.javaclass

6、PersonA private String name; public void setName(String newName) name=newName; public String getName() return name; class StudentA extends PersonA /继承PersonA类 private String department; public void setDepartment(String newDepartment) department=newDepartment; public String getDepartment() return dep

7、artment; class C1 /定义一个C1类，测试类 public static void main(String args) StudentA s1=new StudentA(); s1.setName(张三) ; s1.setDepartment(计算机系); System.out.println(你好，我是+s1.getName(); /显示s1的姓名 System.out.println(我是+s1.getDepartment()+的学生) ; /显示s1的系别 10./Hello.java class Avoid f() System.out.println(I am A);

8、 class B public class Hello public static void main(String args) System.out.println(hello); A a=new A(); a.f(); 11.public class Ji public static void main(String args) int i,s=0; for(i=1;i100;i=i+2) s=s+i; System.out.println(1+3+.+99=+s); 12.import java.util.*;public class jie public static void mai

9、n(String args) int n,i,s=1; Scanner buf=new Scanner(System.in); do System.out.print (输入正整数：); n=buf.nextInt( ); while (n=0); for(i=1;i=90)System.out.println(优秀);else if(a=80)System.out.println(良);else if(a=70)System.out.println(中);else if(a=60)System.out.println(及格);elseSystem.out.println(不及格);14./f

10、ilename:Li4_2.javapublic class Li4_2 public static void main(String args) int testScore; char grade; Scanner reader=new Scanner(System.in); System.out.print(请输入成绩：); grade=reader.nextInt(); switch(grade) case 90:; break; case B:testScore=80-90; break; case C:testScore=70-80; break; case D:testScore=

11、60-70; break; case EtestScore=0-60; System.out.println(评定成绩为：+grade); 15./filename:Li4_12.javapublic class Li4_12 public static void mian(String args) final int MAX=100; int j,k,n; System.out.println(2+MAX+之间的所有素数为;); System.out.print(2t); n=1; k=3; do j=3; while(jMath.sqrt(k) System.out.print(k+t);

12、 n+; if 16./filename: Max.javaimport java.util.*; /加载java.util类库里的所有类public class Max public static void main(String args) int num1,num2,num3; int max; Scanner reader=new Scanner(System.in); System.out.print(请输入3个整数：); num1= reader.nextInt(); num2= reader.nextInt(); num3= reader.nextInt(); max=num1;

13、 max=maxnum2?max:num2; max=maxnum3?max:num3; System.out.println(max); 17.class MyOver public int A(int a, int b) /定义两个参数的A方法，得到a+b的和 int s; s=a+b; return s; public int A(int a,int b,int c) int s; s=a+b; s=s+c; /要求调用两个参数的A方法，得到a+b+c的和 return s; public int A(int a,int b,int c,int d) int s; s=a+b; s=s+

14、c+d;/要求调用三个参数的A方法，得到a+b+c+d的和 return s; public static void main(String args) MyOver p=new MyOver(); System.out.println(1+2=+p.A(1,2); System.out.println(1+2+3=+p.A(1,2,3); System.out.println(1+2+3+4=+p.A(1,2,3,4); 18.class Student String name; int age; int chinese; int math; int english; public Stud

15、ent() /定义无参构造方法 name=; age=0; chinese=0; math=0; english=0; System.out.println(Student()构造方法被调用); public Student(String newName) /定义一个参数的构造方法 name=newName; public Student(String newName,int newChinese) /定义两个参数的构造方法 name=newName; chinese=newChinese; public Student(String newName,int newAge,int newChi

16、nese,int newMath,int newEnglish) /定义五个参数的构造方法 name=newName;age=newAge;chinese=newChinese;math=newMath;english=newEnglish; int total() return chinese+math+english; int average() return total()/3; public void show() /显示对象各属性的值 System.out.println(你好，我叫+name+，+我今年+age+岁); System.out.println(我的语文成绩是+chin

17、ese); System.out.println(我的数学成绩是+math); System.out.println(我的英语成绩是+english); System.out.println(我的总分是+total(); class Mystudent /主类 public static void main(String args) Student s1=new Student(); /创建Student类的一个对象，不传入参数 s1.show(); Student s2=new Student(张三);/创建Student类的一个对象，传入一个参数：张三 s2.show(); Student

18、 s3=new Student(张三,80); s3.show(); Student s4=new Student(张三,13,80,90,85); s4.show(); 19.class StudentString name;int age;int chinese,math,english;int total()return(chinese+math+english);double aver()return(chinese+math+english)/3;public class mystudent3public static void main(String args)Student s1

19、,s2;s1=new Student();s2=new Student();s1.name=张三;s1.age=13;s1.chinese=80;s1.math=90;s1.english=85;s2.name=李四;s2.age=12;s2.chinese=90;s2.math=80;s2.english=90;System.out.println(你好，我叫+s1.name+，+我今年+s1.age+岁);System.out.println(我的总分是+s1.total();System.out.println(我的平均分是+s1.aver();System.out.println(你好

20、，我叫+s2.name+，+我今年+s2.age+岁);System.out.println(我的总分是+s2.total();System.out.println(我的平均分是+s2.aver();if(s1.total()s2.total()System.out.println(s1.name+的成绩好);elseif(s1.total()s2.total()System.out.println(s2.name+的成绩好);elseSystem.out.println(两者的成绩一样); 20.import java.util.*;public class N public static

21、void main(String args) int i,n,s; Scanner reader=new Scanner(System.in); do System.out.print(请输入大于1的整数i：); i=reader.nextInt(); while(i=0); for(i=1;i=n;i+) s=s*i; System.out.println (n!=+s); 21.public class Xunhuan4public static void main (String args) outer: for (int i=1; i10; i+) inner: for (int j=

22、1; j10; j+) if (ij) System.out.println(); continue outer; System.out.print( +i+*+j+=+i*j); 22.public class Xunhuan3public static void main(String args)outer:for (int i=1; i=9;i+) for (int j=1; j i) break; if (i=7) break outer; System.out.print( +i+*+j+=+i*j); System.out.println(); 23.import java.uti

23、l.*;public class Xunhuan2 public static void main(String args) int n,i,sum=0; Scanner buf=new Scanner(System.in); do System.out.print (输入正整数：); n=buf.nextInt( ); while (n=0); for(i=1;i=n;i+) int s=1; for(int j=1;j=i;j+) s*=j; sum=sum+s; System.out.println (1!+2!+n+!+=+sum); 24./filename:Xi5_1.javapu

24、blic class Xi5_1 public static void main(String args) int i,j,sum=0; double ave; int a=new int10; System.out.print(请输入10个数： ); for(i=0;ia.length;i+) sum=sum+ai; ave=sum/10; for( j=0;jave) System.out.println(大于平均数的有：+aj); 25.public class Xi5_10 public static void main(String args) throws IOException

25、BufferedReader br = new BufferedReader(new InputStreamReader(System.in); String str = br.readLine(); StringBuffer sb = new StringBuffer(); sb.append(str); int a = 0, b = 0, c = 0; for (int j = 0; j sb.length(); j+) /4857代表09 if (sb.charAt(j) = 48) a+; /6590代表A-Z,97-122代表az if (sb.charAt(j) = 65 | sb

26、.charAt(j) = 97) b+; if (sb.charAt(j) = ) c+; System.out.println(数字个数: + a); System.out.println(字母数: + b); System.out.println(空格数: + c); System.out.println(其他字符数： + (sb.length() - a - b - c); 26.class Student String name,sex,ban; int num,math,chinese,english; int total()return(chinese+math+english);

27、double aver()return(chinese+math+english)/3;public class Xi6_13public static void main(String args)Student s1,s2;s1=new Student();s2=new Student();s1.num=1;s1.name=张三;s1.sex=男;s1.ban=是;s1.chinese=80;s1.math=90;s1.english=85;s2.num=2;s2.name=李四;s2.sex=男;s2.ban=否;s2.chinese=90;s2.math=80;s2.english=90

28、;System.out.println(学号 +s1.num+姓名 +s1.name+性别 +s1.sex+班干部否+s1.ban);System.out.println(我的总分是+s1.total();System.out.println(我的平均分是+s1.aver();System.out.println(学号 +s2.num+姓名 +s2.name+性别 +s2.sex+班干部否+s2.ban);System.out.println(我的总分是+s2.total();System.out.println(我的平均分是+s2.aver();if(s1.total()s2.total()

29、System.out.println(s1.name+的成绩好);elseif(s1.total()s2.total()System.out.println(s2.name+的成绩好);elseSystem.out.println(两者的成绩一样); 27.abstract class Shape protected String name; public Shape(String xm) name=xm; System.out.print(名称:+name); abstract public double getArea();class Circle extends Shape privat

30、e double pi=3.14; private double radius; public Circle(String shapeName,double r) super(shapeName); radius=r; public double getArea() return pi*radius*radius; class Retangle extends Shape private double width; private double height; public Retangle(String shapeName,double width,double height) super(

31、shapeName); this.width=width; this.height=height; public double getArea() return width*height; public class Xi8_10 public static void main(String args) Shape rect=new Retangle(长方形,6.5,10.3); System.out.print(;面积=+rect.getArea(); Shape circle=new Circle(圆,10.2); System.out.print(;面积=+circle.getArea()

32、; 28./filename:Xi8_11.javainterface Shape final double pi=3.14; abstract double getArea(); class Circle implements Shape double radius; public Circle(double r) radius=r; public double getArea() return pi*radius*radius; class Rectangle implements Shape private double width; private double height; pub

33、lic Rectangle(double width,double height) this.width=width; this.height=height; public double getArea() return width*height; public class Xi8_11 public static void main(String args) Shape circle=new Circle(5.0); System.out.print(圆面积=+circle.getArea(); Rectangle rect=new Rectangle(6.5,10.8); System.o

34、ut.print(矩形面积=+rect.getArea(); 29.import java.io.*;public class Xt5_10 public static void main(String args) throws Exception String usage=请输入任意字符以回车结束:; System.out.println(usage); BufferedReader br = new BufferedReader(new InputStreamReader(System.in); System.out.print(请输入:); String tmp = br.readLine(); System.out.println(处理前您的输入是:+tmp); int cc,ic,sc; cc=ic=sc=0; char array = tmp.toCharArray(); for(int i=0; iarray.length; i+) if(arrayi= )sc+; else if(arrayi=A | arrayi=a)cc+; else if(arrayi=0)ic+; Syst