项目要求：
在控制台输出一个DVD管理系统
拥有六个功能：
1、新增
2、查看
3、删除
4、借出
5、归还
6、退出
源码：
DVD类：
public class DVD {
//DVD类
private String name;
private int state;
private int date;
private int count;
//private表示私有，增加安全性
//无参方法
public DVD() {
}
//有参构造
public DVD(String name, int state, int date, int count) {
this.name = name;
this.state = state;
this.date = date;
this.count = count;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getState() {
return state;
}
public void setState(int state) {
this.state = state;
}
public int getDate() {
return date;
}
public void setDate(int date) {
this.date = date;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
//toString方法
@Override
public String toString() {
return "DVD [name='" + name +
", state=" + state +
", date=" + date +
", count=" + count +
']';
}
}
实现类：
public class newGongNeng {
DVD[] dvd = new DVD[6];
//初始化
void chushihuan() {
dvd[0] = new DVD("诡秘之主", 1, 0, 18);
dvd[1] = new DVD("完美世界", 0, 0, 22);
dvd[2] = new DVD("悲惨世界", 0, 0, 10);
}
void qidong() {
Scanner s = new Scanner(System.in);
//菜单
System.out.println("------------------------------");
System.out.println("|-----欢迎使用 DVD租借器-----|");
System.out.println("------------------------------");
System.out.println("| 1.新增 |");
System.out.println("| 2.查看 |");
System.out.println("| 3.删除 |");
System.out.println("| 4.租借 |");
System.out.println("| 5.归还 |");
System.out.println("| 6.退出 |");
System.out.println("------------------------------");
System.out.println("请选择：");
int xuhao = s.nextInt();
switch (xuhao) {
case 1://新增
xinzeng();
fanhui();
break;
case 2://查看
chakan();
fanhui();
break;
case 3://删除
shanchu();
fanhui();
break;
case 4://租借
zujie();
fanhui();
break;
case 5://归还
guihuan();
fanhui();
break;
case 6://退出
System.out.println("再见！");
break;
default:
System.out.println("输入错误！");
}
}
//返回方法
void fanhui() {
System.out.println("------------------------------------");
System.out.println("返回输入0");
Scanner s = new Scanner(System.in);
//判断输入的是否为0
if (s.nextInt() == 0) {
qidong();
} else {
System.out.println("输入错误！");
//失败的话重新调用，递归
fanhui();
}
}
//新增
void xinzeng() {
Scanner s = new Scanner(System.in);
System.out.println("新增");
System.out.print("请输入名称：");
//获取输入的名称
String name = s.next();
//使用for循环查找内容为空的DVD
for (int i = 0; i < dvd.length; i++) {
//如果查找到为空的DVD 就将输入名称赋给它
if (dvd[i] == null) {
dvd[i] = new DVD(name, 0, 0, 0);
System.out.println("成功！");
break;
}
}
}
//查看
void chakan() {
System.out.println("查看");
System.out.println("序号\t状态\t名称\t\t日期\t次数");
//循环遍历整个数组
for (int i = 0; i < dvd.length; i++) {
//如果不为空，将判断是否借出的属性转换为文本
if (dvd[i] != null) {
String x = null;
//如果stata为1 便为已借出
if (dvd[i].getState() == 1) {
x = "已借出";
} else if (dvd[i].getState() == 0) {
x = "未借出";
}
//打印
System.out.println((i + 1) + "\t" + "\t" + x + "\t" + dvd[i].getName() + "\t" + dvd[i].getDate() + "号" + "\t" + "\t" + dvd[i].getCount() + "次");
}
}
}
//删除
void shanchu() {
Scanner s = new Scanner(System.in);
System.out.println("删除");
System.out.print("删除的名称：");
//获得要删除的名称
String name = s.next();
//设一个o判断条件
int o = -1;
//遍历寻找名称对应的DVD
for (int i = 0; i < dvd.length; i++) {
if (dvd[i] != null) {
if (dvd[i].getName().equals(name)) {
o = i;
break;
}
}
}
//如果找到对应DVD
if (o != -1) {
//如果已借出，则失败
if (dvd[o].getState() == 1) {
System.out.println("DVD已借出，暂时不能删除.");
} else if (dvd[o].getState() == 0) {
System.out.println("删除成功！");
dvd[o] = null;
}
} else if (o == -1) {//没有找到
System.out.println("没有此DVD");
}
}
void zujie() {
Scanner s = new Scanner(System.in);
System.out.println("租借");
System.out.print("输入租借的名称：");
String name = s.next();
int o = -1;
for (int i = 0; i < dvd.length; i++) {
if (dvd[i] != null) {
if (dvd[i].getName().equals(name)) {
o = 1;
break;
}
}
}
if (o != -1) {
if (dvd[o].getState() == 1) {
System.out.println("DVD已借出.");
} else if (dvd[o].getState() == 0) {
System.out.print("输入日期：");
int date = s.nextInt();
dvd[o].setDate(date);
dvd[o].setCount(dvd[o].getCount() + 1);
dvd[o].setState(1);
System.out.println("租借成功 ！");
}
} else if (o == -1) {
System.out.println("没有此DVD");
}
}
void guihuan() {
Scanner s = new Scanner(System.in);
System.out.println("归还");
System.out.print("归还名称：");
String name = s.next();
int o = -1;
for (int i = 0; i < dvd.length; i++) {
if (dvd[i] != null) {
if (dvd[i].getName().equals(name)) {
o = 1;
break;
}
}
}
if (o != -1) {
if (dvd[o].getState() == 1) {
System.out.print("输入日期 ：");
int data = s.nextInt();
System.out.println("租金为：" + (data - dvd[o].getDate()) * 2 + "元");
dvd[o].setState(0);
dvd[o].setDate(0);
} else if (dvd[o].getState() == 0) {
System.out.println("此DVD没有借出，归还失败");
}
} else if (o == -1) {
System.out.println("没有此DVD");
}
}
}