1、1. 分解质因数 package d2;import java.util.Scanner;public class Zys public static void main(Stringargs)Scanner sc=new Scanner(System.in);System.out.print(“请输入一个数：“);int a=sc.nextInt();int n=2;System.out.println(a+“=“);while(a=n)if(a%n=0)System.out.print(n+“*“);a=a/n;if(a%n!=0)n+;2. 判断是否是回文数ackage c2;impor
2、t java.util.Scanner;public class huiwenshu public static void main(Stringargs)/System.out.println(“请输入一个数“);Scanner a=new Scanner(System.in);System.out.println(“请输入一个数“);String b=a.nextLine();boolean c=false;for(int i=0;i=0;i-)System.out.println(ai);4. 水仙花数public class sxh public static void main(St
3、ringargs)int a,b,c;for(int i=100;i= w.length) System.out.println(“军队装备足够了!“);return; else wsize = weapon;size+;public void attacAll() for (Weapon wea : w) if (wea != null) wea.attack();public void moveAll() for (Weapon wea : w) if (wea != null) wea.move();package A1;class Flighter extends Weapon pub
4、lic void attack() System.out.println(“Flighter attacks“);public void move() System.out.println(“Flighter moves“);public class NotSimple public static void main(String args) Army a = new Army(3);a.addWeapon(new Tank();a.addWeapon(new Flighter();a.addWeapon(new WarShip();a.attacAll();a.moveAll();inter
5、face Assaultable abstract public void attack();interface Mobile abstract public void move();abstract class Weapon implements Assaultable, Mobile class Tank extends Weapon public void attack() System.out.println(“Tank attacks“);public void move() System.out.println(“Tank moves“);package A1;class WarS
6、hip extends Weapon public void attack() System.out.println(“WarShip attacks“);public void move() System.out.println(“WarShip moves“);class Army private Weapon w = null;private int size = 0;private Army() public Army(int i) w = new Weaponi;public void addWeapon(Weapon weapon) if (size = w.length) Sys
7、tem.out.println(“军队装备足够了!“);return; else wsize = weapon;size+;public void attacAll() for (Weapon wea : w) if (wea != null) wea.attack();public void moveAll() for (Weapon wea : w) if (wea != null) wea.move();package A1;class Flighter extends Weapon public void attack() System.out.println(“Flighter at
8、tacks“);public void move() System.out.println(“Flighter moves“);package A1;public class NotSimple public static void main(String args) Army a = new Army(3);a.addWeapon(new Tank();a.addWeapon(new Flighter();a.addWeapon(new WarShip();a.attacAll();a.moveAll();interface Assaultable abstract public void
9、attack();interface Mobile abstract public void move();abstract class Weapon implements Assaultable, Mobile package A1;class Tank extends Weapon public void attack() System.out.println(“Tank attacks“);public void move() System.out.println(“Tank moves“);package A1;class WarShip extends Weapon public v
10、oid attack() System.out.println(“WarShip attacks“);public void move() System.out.println(“WarShip moves“);一个公司有2辆小汽车(car)，一辆公共汽车(bus)，其中：第一小辆汽车每天跑300公里；第二辆小汽车每天跑400公里；公共汽车每天跑500公里，已知小汽车每百公里耗油量为7升，公共汽车每百公里耗油量为10升，用接口编程计算每天所有交通工具的耗油量。public interface Vehicle int getfuel();import c1.Vehicle;public clas
11、s bus implements Vehicle int kil;bus(int k1)kil=k1;public int getfuel()return(10*kil/100);import c1.Vehicle;class car implements Vehicle int kil;car(int k1)kil=k1;public int getfuel()return(7*kil/100);import c1.bus;import c1.car;import pany1;import c1.Vehicle;public class company1 Vehicle a;company1
12、()a=new Vehicle3;a0=new car(300);a1=new bus(500);a2=new car(400);int rf()int i=0;for(i=0;i setWorker=new HashSet();Scanner sc=new Scanner(System.in);String str=sc.nextLine();Iterator it =setWorker.iterator();while (it.hasNext() if (it.equals(str) System.out.println(“放入 HashSet 中时不会出现重复元素“);Set）有如下两个
13、类（只写了类的属性，请自行添加相应的构造方法和 get/set 方法）要求，完善 Worker 和 Address 类，使得 Worker 对象能够正确放入 HashSet 中：即将Worker 放入 HashSet 中时不会出现重复元素。并编写相应测试代码。package z3;public class Address private String addressName;private String zipCode;public void address(String aN,String zC)this.addressName=aN;this.zipCode=zC;public Strin
14、g getAddressName() return addressName;public void setAddressName(String addressName) this.addressName = addressName;public String getZipCode() return zipCode;public void setZipCode(String zipCode) this.zipCode = zipCode;public class Workerprivate String name;private int age;private double salary;pri
15、vate Address address;public void worker(String n,int a,double s,Address ad)this.name=n;this.age=a;this.salary=s;this.address=ad;public String getName() return name;public void setName(String name) this.name = name;public int getAge() return age;public void setAge(int age) this.age = age;public doubl
16、e getSalary() return salary;public void setSalary(double salary) this.salary = salary;public Address getAddress() return address;public void setAddress(Address address) this.address = address;编写一个异常类 MyException，再编写一个类Student，该类有一个产生异常的方法 speak(int m)。要求参数 m的值大于 1000时，方法抛出一个MyException对象。最后编写主类，在方法中
17、创新Student对象，让该对象调用 speak()方法。public class MyException extends Exceptionpublic MyException()this(“发生异常了“);public MyException(String message) super(message);public class Student public void speak(int m)throws MyExceptionif(m1000)throw new MyException(“发生了异常“);public class Test1 public static void main
18、(String args) Student s=new Student();/ MyException me=new MyException();int m;trys.speak(1200);catch(MyException e)System.out.println(“出现了异常“);q创建类 Computer，该类中有一个计算两个数的最大公约数的方法。如果向该方法传递负整数，该方法就会抛出自定义异常。package a2;public class MyException extends Exception private String reason;public MyException(i
19、nt x,int y)reason=“出现异常“;public String getReason()return reason;package a2;import java.util.Scanner;public class Computer int m,n;public void zdgys(int x,int y)throws MyExceptionif(xmax)max=aj;if(aj=0)count+;index=sentense.indexOf(hello,index+hello.length();catch (Exception e) System.out.println(“文件
20、目录错误“);return count;public static void main(String args) throws IOException String article=“./src/aritle.txt“;String hello=“hello“;HelloCount h=new HelloCount();System.out.println(“单词“+hello+“在文章中出现的次数：“+h.getHelloCount(article, hello);4. 编写一个程序 WriteLog.java实现如下功能：从键盘输入若行文字（可能包含中文），当最后一行输入 quit#时，退
21、出程序且将输入内容除 quit#外全部存入文件 c:log.txt中package z5;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.util.Scanner;public class WriteLog private static PrintWriter out;public static void main(String args) try out =
22、new PrintWriter(new OutputStreamWriter(new FileOutputStream(“c:/log.txt“); catch (FileNotFoundException e) e.printStackTrace();Scanner in = new Scanner(System.in);String line =null;while (!“quit#“.equals(line = in.nextLine() out.println(line);out.flush();out.close();1. 编写程序:使用字符输入、输出流读取文件，将一段文字加密后存入
23、文件，然后再读取，并将加密前与加密后的文件输出。package IOTest;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.util.Scanner;public class Jiami public static void ma
24、in(String args) throws IOException BufferedReader br=new BufferedReader(new FileReader(new File(“./abc.txt“) );BufferedWriter bw=new BufferedWriter(new FileWriter(new File(“./abc.txt“),true);Scanner scan=new Scanner(System.in);String str=scan.nextLine();char c=str.toCharArray();System.out.println();
25、char w=new charc.length;for (int i = 0; i chi System.out.println(“英文字母有“+eng);System.out.println(“空格有“+kong);System.out.println(“数字有“+shu);System.out.println(“其他字符有“+qi);一、数据库综合应用练习 1：1.在数据库中建立一个表，表名为 student，其结构为：学号（num）、姓名（name）、性别（sex）、年龄（age）、成绩（score）2.在 student表中输入四条记录（自己设计具体数据内容）3.在屏幕上显示表中的所有
26、内容4.增加两条学生记录：05，李芳，女，20,7606，张良，男，19,705.将每人的年龄增加 2岁6.删除成绩不及格的学生记录7.显示最终表格的内容package a1;import java.io.InputStream;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.Properties;public class JDBCUt
27、ils private static String url = “jdbc:sqlserver:/localhost:1433;DatabaseName=student“;private static String driver = “com.microsoft.sqlserver.jdbc.SQLServerDriver“;private static String user = “sa“;private static String password =“123456“;statictryClass.forName(driver);catch(ClassNotFoundException e
28、)System.out.println(“找不到驱动程序类 ，加载驱动失败！“); e.printStackTrace() ; public static Connection getConnection() throws SQLExceptionreturn DriverManager.getConnection(url, user, password);public static void release(Connection conn,Statement st,ResultSet rs)if(rs!=null)tryrs.close();catch (Exception e) e.pri
29、ntStackTrace();finallyif(st!=null)tryst.close();catch (Exception e) e.printStackTrace();finallyif(conn!=null)tryconn.close();catch (Exception e) e.printStackTrace();finallypackage a1;import java.sql.*;public class JdbcXianshi public static void main(String args) Connection conn = null;PreparedStatem
30、ent st = null;ResultSet rs = null;try conn =JDBCUtils.getConnection();String str=“select * from student order by num“;st = conn.prepareStatement(str);rs = st.executeQuery();while (rs.next() System.out.print(rs.getString(“num“);System.out.print(rs.getString(“name“);System.out.print(rs.getString(“sex“
31、);System.out.print(rs.getString(“age“);System.out.println(rs.getString(“score“); catch (SQLException e) / TODO Auto-generated catch blocke.printStackTrace(); finally JDBCUtils.release(conn, st, rs);package a1;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;impo
32、rt java.sql.SQLException;public class Add public static void main(String args) Connection conn = null;PreparedStatement st = null;ResultSet rs = null;try conn=JDBCUtils.getConnection();String str=“insert into student values(?,?,?,?,?)“;st=conn.prepareStatement(str);st.setString(1, “05“);st.setString(2, “李芳“);st.setString(3, “女“);st.setInt(4, 20);st.setInt(5, 76);st.execute(); catch (SQLException e) / TODO Auto-generated catch blocke.printStackTrace();finallyJDBCUtils.release(conn, st, rs);
