《Java程序设计案例教程》考试卷B答案.docx

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1、Java程序设计案例教程考试卷B答案()略 (二) import java.util.Scanner;public class QuestionB2 public static void main(String args) Scanner sc = new Scanner(System.in);(输入正方形的边长：);double side = sc.nextDouble();(正方形的周长：+ 4 * side);(正方形的面积：+ Math.pow(side, 2); ) (三)public class QuestionB3 public static void main(String a

2、rgs) int fl = 1, f2 = 1;for(int i = l;i = 18;i+)System.out.print(fl + “t” + f2 + f)；if(i % 2 = 0)System.out.println();f 1 = f 1 + f2;f 2 = f2 + fl;) (四)public abstract class Vehicle private String fuel;燃料 private double speed;速度public String getFuel() return fuel;)public void setFuel(String fuel) th

3、is.fuel = fuel;)public double getSpeed() return speed;public void setSpeed(double speed) this.speed = speed;)public abstract void run();)(五)public class Automobile extends Vehicle private String brand;品牌public String getBrand() return brand;)public void setBrand(String brand) this.brand = brand;)Ove

4、rridepublic void run() (在公路上行驶)；)(六)import java.util.Scanner;public class QuestionB6 public static void main(String args) Scanner sc = new Scanner(System.in);(输入杨辉三角的级数：)； int level = sc.nextlnt();int y = new intlevel川;行数 int i, j;for(i = 0;i y.length;i+)yi = new int+ 1;歹ij数y00 = 1;第一行笫一列元素 for(i =

5、l;i y.length;i+)yi0 = 1;从第二行开始所有第一列所有元素 for(j = l;j= 0;i-)输出for(j = 0;j yi.length;j+)System.out.print(yij + );System.out.printlnf);)(七)public class QuestionB7 extends Thread public void run() try(for(int i = l;i = 10;i+)System.out.println(int)(Math.random() * 100);sleep(SOO);)catch(lnterruptedExcept

6、ion ie)ie.printStackTrace();)public static void main(String args) QuestionB7 qb7 = new QuestionB7();qb7.start();)(八)import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.Scanner;import mons.c

7、odec.digest.DigestUtils; 力 口密组件包public class QuestionB8 public static void main(String args) Scanner sc = new Scanner(System.in);(请输入用户名：);String name = sc.next();(请输入密码：);String password = sc.next();try(Class.forName(com.mysql.jdbc.Driver)；catch(ClassNotFoundException ce)System.out.println(ce);)try

8、Connectioncon=DriverManager.getConnection(jdbc:mysql:/localhost:3306/myShujiku, root, mysql)；PreparedStatement ps = con.prepareStatement(select * from zhanghu where xm =?)；ps.setString(l, xm);ResultSet rs = ps.executeQuery();if(rs.next()if(DigestUtils.md5Hex(password).equals(rs.getString(mm)用户密码摘要 处理(欢迎访问数据库!)；else(密码不正确!);elseSystem.out.println(用户不存在!);rs.close();ps.closef);con.close();catch(SQLException ce)System.out.println(ce);