《Java程序设计案例教程》考试卷B答案.doc

《《Java程序设计案例教程》考试卷B答案.doc》由会员分享，可在线阅读，更多相关《《Java程序设计案例教程》考试卷B答案.doc（4页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、Java程序设计案例教程考试卷B答案（一）略（二）import java.util.Scanner;public class QuestionB2 public static void main(String args) Scanner sc = new Scanner(System.in);System.out.print(输入正方形的边长：);double side = sc.nextDouble();System.out.println(正方形的周长： + 4 * side);System.out.println(正方形的面积： + Math.pow(side, 2);（三）public

2、 class QuestionB3 public static void main(String args) int f1 = 1, f2 = 1;for(int i = 1;i = 18;i+)System.out.print(f1 + t + f2 + t);if(i % 2 = 0)System.out.println();f1 = f1 + f2;f2 = f2 + f1;（四）public abstract class Vehicle private String fuel;/燃料private double speed;/速度public String getFuel() retu

3、rn fuel;public void setFuel(String fuel) this.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 setBra

4、nd(String brand) this.brand = brand;Overridepublic void run() System.out.println(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);System.out.print(输入杨辉三角的级数：);int level = sc.nextInt();int y = new intlevel;/行数int i, j

5、;for(i = 0;i y.length;i+)yi = new inti + 1;/列数y00 = 1;/第一行第一列元素for(i = 1;i y.length;i+)yi0 = 1;/从第二行开始所有第一列所有元素for(j = 1;j = 0;i-)/输出for(j = 0;j yi.length;j+)System.out.print(yij + );System.out.println();（七）public class QuestionB7 extends Thread public void run() tryfor(int i = 1;i = 10;i+)System.ou

6、t.println(int)(Math.random() * 100);sleep(500);catch(InterruptedException 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

7、;import java.sql.SQLException;import java.util.Scanner;import mons.codec.digest.DigestUtils;/加密组件包public class QuestionB8 public static void main(String args) Scanner sc = new Scanner(System.in);System.out.print(请输入用户名：);String name = sc.next();System.out.print(请输入密码：);String password = sc.next();tr

8、yClass.forName(com.mysql.jdbc.Driver);catch(ClassNotFoundException ce)System.out.println(ce);tryConnection con = DriverManager.getConnection(jdbc:mysql:/localhost:3306/myShujiku, root, mysql);PreparedStatement ps = con.prepareStatement(select * from zhanghu where xm = ?);ps.setString(1, xm);ResultSet rs = ps.executeQuery();if(rs.next()if(DigestUtils.md5Hex(password).equals(rs.getString(mm)/用户密码摘要处理System.out.println(欢迎访问数据库！);elseSystem.out.println(密码不正确！);elseSystem.out.println(用户不存在！);rs.close();ps.close();con.close();catch(SQLException ce)System.out.println(ce);