学习JAVA第三、四天！完成了，三个作业！拷贝出来。

题目：

1、   新建java项目，实现一个类Person，包含属性、多个构造器（构造方法）、自有方法。

设置Person类，属性有：姓名，年龄，性别，工号，set、get方法，要求：创建对象，并写一个函数进行自我介绍，输出:我叫XXX，性别X，工号XXX，今年X岁， 至2026年X岁。

(俩个类：firstQuestion.java,Person.java)

firstQuestion.java

package firstQuestion;import java.util.Scanner;import java.util.Calendar;public class firstQuestion {public static void main(String[] args) {// TODO Auto-generated method stubPerson p = new Person();Scanner sc = new Scanner(System.in);System.out.print("输入姓名：");p.setName(sc.next());System.out.print("输入年龄：");p.setAge(sc.nextInt());System.out.print("输入ID：");p.setId(sc.nextInt());System.out.print("输入性别：");p.setSex(sc.next());mySelf(p.getAge(),p.getId(),p.getName(),p.getSex());sc.close();}public static void mySelf(int age,int id ,String name,String sex){Calendar c = Calendar.getInstance();int year = c.get(Calendar.YEAR);System.out.println("我叫:"+name+"，性别:"+sex+"，工号"+id+"，今年"+age+"岁， 至2026年"+(2026-year+age)+"岁");}}

Person.java

package firstQuestion;public class Person {public String name; //姓名public int age;//年龄public String sex;//性别public int id;//工号/* * 构造函数 */public void  setName(String name){this.name = name;}public void  setAge(int age){this.age = age;}public void  setSex(String sex){this.sex = sex;}public void  setId(int id){this.id = id;}public String  getName(){return name;}public int  getAge(){return age;}public String  getSex(){return sex;}public int  getId(){return id;}}

2、   实现一个类Rectangle（长方形），属性有长，宽，面积。

要求：创建两个长宽不一的对象r1，r2，编写一个方法，输出两者的面积之差，差值不能为负值。

(俩个类：secondQuestion.java，Rectangle.java)

secondQuestion.java

package secondQuestion;import java.util.Scanner;public class secondQuestion {public static void main(String[] args) {// TODO Auto-generated method stubRectangle r1 = new Rectangle();Rectangle r2 = new Rectangle();Scanner sc = new Scanner(System.in);System.out.println("请输入第一个长方形的长和宽！");System.out.print("长：");r1.setL(sc.nextDouble());System.out.print("宽：");r1.setK(sc.nextDouble());System.out.println("请输入第二个长方形的长和宽！");System.out.print("长：");r2.setL(sc.nextDouble());System.out.print("宽：");r2.setK(sc.nextDouble());comPare(r1.getArea(),r2.getArea());sc.close();}public static void comPare(double s1,double s2){if (s1 > s2){System.out.println("第一个大于第二个,面积差"+(s1-s2));}else{System.out.println("第二个大于第一个,面积差"+(s2-s1));}}}

Rectangle.java

package secondQuestion;public class Rectangle {public double s;public double l;public double k; public double getL(){return l;}public double getK(){return k;}public void setL(double l){this.l = l;}public void setK(double k){this.k = k;}public double getArea(){return l *  k;}}

3、   实现一个类MyAccount（账户），属性有：账号账户姓名 地址 存款余额 利率。方法：存款 取款 查询余额 计算利息（会有涉及8种基本类型，可以提前熟悉），带参和不带参的构造方法，带参的存取款方法等，要求创建对象并输出账户详情；存进1000元后的账户详情；取出500元的账户详情，余额不足要给出提示；修改利率后的账户详情

(三个类：thirdQuestion.java，MyAccount.java，lilvjs.java)

thirdQuestion.java

package thirdQuestion;import java.util.Scanner;import java.math.BigDecimal;public class thirdQuestion {/** * @param args */static MyAccount man = new MyAccount();public static void main(String[] args) {// TODO Auto-generated method stub//基本信息配置man.setId(123456);man.setName("陈浩");man.setAddr("北京天安门");man.setLilv("0.0001");man.setYuE("88888");menu();}//菜单选项public static void menu(){System.out.println("菜单选项：\r\n" +"1.账户基本信息查看\r\n" +"2.取款\r\n" +"3.存款\r\n" +"4.利率计算\r\n" +"5.退出\r\n" +"请输入选项前数字进行选择：");Scanner sc = new Scanner(System.in);int x = 0;try{ x = sc.nextInt();}catch(Exception e){//System.out.println("请输入数字！！");}switch(x){case 1:info();break;case 2:qukuan();break;case 3:cunkun();break;case 4:lljs();break;case 5:exit();break;default:System.out.printf("输入无效，请重新输入！");menu();}sc.close();}//个人信息查询public static void info(){System.out.println("账户的基本信息：\r\n" +"姓名:"+man.getName()+"\r\n账号:"+man.getId()+"\r\n地址:"+man.getAddr()+"\r\n余额:"+man.getYuE()+"\r\n");System.out.println("查询完成\r\n" +"1:返回菜单。2:直接退出\r\n" +"请输入选项:");Scanner sc = new Scanner(System.in);int x = 0;try{ x = sc.nextInt();}catch(Exception e){System.out.println("请输入数字！！");};queren(x);sc.close();}//取款public static void qukuan(){System.out.println("当前账户余额为:" +man.getYuE()+"\r\n请输入您要取款的金额:");Scanner sc = new Scanner(System.in);double x = 0;try{ x = sc.nextDouble();}catch(Exception e){System.out.println("请输入有效数字！！取款失败！");exit();}BigDecimal s1 = new BigDecimal(man.getYuE());BigDecimal s2 = new BigDecimal(Double.toString(x));int r = s1.subtract(s2).compareTo(BigDecimal.ZERO);if(r>0||r==0){man.setYuE(s1.subtract(s2).toString());System.out.println("取款成功！\r\n" +"当前余额为:"+man.getYuE()+"\r\n1:返回菜单。2:直接退出\r\n" +"请输入选项:");int x1 = 0;try{ x1 = sc.nextInt();}catch(Exception e){//System.out.println("请输入数字！！");};queren(x1);}else{System.out.println("对不起，余额不足,取款失败！\r\n" +"\r\n1:返回菜单。2:直接退出\r\n" +"请输入选项:");int x1 = 0;try{ x1 = sc.nextInt();}catch(Exception e){//System.out.println("请输入数字！！");};queren(x1);}sc.close();}//存款public static void cunkun(){System.out.println("当前账户余额为:" +man.getYuE()+"\r\n请输入您要存款的金额:");Scanner sc = new Scanner(System.in);double x = 0;try{ x = sc.nextDouble();}catch(Exception e){System.out.println("请输入有效数字！！存款失败！");exit();}BigDecimal s1 = new BigDecimal(man.getYuE());BigDecimal s2 = new BigDecimal(Double.toString(x));man.setYuE(s1.add(s2).toString());System.out.println("存款成功！\r\n" +"当前余额为:"+man.getYuE()+"\r\n1:返回菜单。2:直接退出\r\n" +"请输入选项:");int x1 = 0;try{ x1 = sc.nextInt();}catch(Exception e){//System.out.println("请输入数字！！");};queren(x1);sc.close();}public static void lljs(){Scanner sc = new Scanner(System.in);System.out.print("当前本金为:" +man.getYuE()+"\r\n请以小数的形式输入存款利率:");double lv = 0;try{ lv = sc.nextDouble();}catch(Exception e){System.out.println("请输入有效利率！！存款失败！");exit();}//BigDecimal r = new BigDecimal(Double.toString(lv));System.out.print("请以整数数的形式输入存款年限:");int n = 1 ;try{ n = sc.nextInt();}catch(Exception e){System.out.println("请输入有效年限！！存款失败！");exit();}man.setLilv(Double.toString(lv));man.setNian(n);lilvjs l = new lilvjs();l.setMoney(man.getYuE());l.setLilv(man.getLiLv());l.setNian(man.getNian());l.getYe();System.out.println("计算成功！\r\n" +"\r\n1:返回菜单。2:直接退出\r\n" +"请输入选项:");int x1 = 0;try{ x1 = sc.nextInt();}catch(Exception e){//System.out.println("请输入数字！！");};sc.close();queren(x1);}public static void exit(){System.out.println("谢谢使用，再见！");}public static void queren(int x){if (x == 1){menu();}else if (x == 2){exit();}else{System.out.println("输入错误！");exit();}}}

MyAccount.java

package thirdQuestion;public class MyAccount {public int id;public String name;public String addr;public String yuE;public String liLv;public int nian;public void setId(int id){this.id = id;}public int getId(){return id;}public void setName(String name){this.name = name;}public String getName(){return name;}public void setAddr(String addr){this.addr = addr;}public String getAddr(){return addr;}public void setYuE(String yuE){this.yuE = yuE;}public String getYuE(){return yuE;}public void setLilv(String liLv){this.liLv = liLv;}public String getLiLv(){return liLv;}public int getNian() {return nian;}public void setNian(int nian) {this.nian = nian;}}

lilvjs.java

package thirdQuestion;import java.math.BigDecimal;public class lilvjs {public String money,lilv;public int nian;public String getMoney() {return money;}public void setMoney(String money) {this.money = money;}public String getLilv() {return lilv;}public void setLilv(String lilv) {this.lilv = lilv;}public int getNian() {return nian;}public void setNian(int nian) {this.nian = nian;}//Scanner sc = new Scanner(System.in);//System.out.print("请输入本金：");//money = sc.next();//System.out.print("请输入利息：");//lilv = sc.next();//System.out.print("请输入年限：");//nian = sc.nextInt();public void getYe(){BigDecimal mon = new BigDecimal(money);BigDecimal Lil = new BigDecimal(lilv);BigDecimal one = new BigDecimal("1");System.out.println("本金:"+money+"\r\n利率："+lilv+"\r\n在"+nian+"年后,变成了:"+mon.multiply((one.add(Lil).pow(nian))));}}