用Java设计一个停车场信息管理系统，能够实现对停车位的信息管理（车位号、车主姓名、性别、年龄、 车牌号）。包含增删改查，最后，停车信息输出到out.txt中，下次打开可以读取数据的代码...

好的，我会为您解答这个问题。

首先，我们需要设计一个停车位信息的类，属性包括车位号、车主姓名、性别、年龄、车牌号。代码如下：

public class ParkingInfo {
    private int parkingNumber;
    private String ownerName;
    private String gender;
    private int age;
    private String carNumber;

    // 构造函数
    public ParkingInfo(int parkingNumber, String ownerName, String gender, int age, String carNumber) {
        this.parkingNumber = parkingNumber;
        this.ownerName = ownerName;
        this.gender = gender;
        this.age = age;
        this.carNumber = carNumber;
    }

    // getter和setter方法
    public int getParkingNumber() {
        return parkingNumber;
    }

    public void setParkingNumber(int parkingNumber) {
        this.parkingNumber = parkingNumber;
    }

    public String getOwnerName() {
        return ownerName;
    }

    public void setOwnerName(String ownerName) {
        this.ownerName = ownerName;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getCarNumber() {
        return carNumber;
    }

    public void setCarNumber(String carNumber) {
        this.carNumber = carNumber;
    }
}

接下来，我们设计一个停车场信息管理系统类，包含增删改查和输出到文件的方法。代码如下：

import java.io.*;

public class ParkingManagementSystem {
    private ParkingInfo[] parkingInfoList;
    private int size;

    // 构造函数
    public ParkingManagementSystem() {
        parkingInfoList = new ParkingInfo[100];
        size = 0;
    }

    // 增加停车信息
    public void addParkingInfo(ParkingInfo parkingInfo) {
        parkingInfoList[size] = parkingInfo;
        size++;
    }

    // 删除停车信息
    public void deleteParkingInfo(int parkingNumber) {
        for (int i = 0; i < size; i++) {
            if (parkingInfoList[i].getParkingNumber() == parkingNumber) {
                for (int j = i; j < size - 1; j++) {
                    parkingInfoList[j] = parkingInfoList[j + 1];
                }
                size--;
                break;
            }
        }
    }

    // 修改停车信息
    public void modifyParkingInfo(int parkingNumber, ParkingInfo newParkingInfo) {
        for (int i = 0; i < size; i++) {
            if (parkingInfoList[i].getParkingNumber() == parkingNumber) {
                parkingInfoList[i] = newParkingInfo;
                break;
            }
        }
    }

    // 查找停车信息
    public ParkingInfo searchParkingInfo(int parkingNumber) {
        for (int i = 0; i < size; i++) {
            if (parkingInfoList[i].getParkingNumber() == parkingNumber) {
                return parkingInfoList[i];
            }
        }
        return null;
    }

    // 输出到文件
    public void outputToFile() {
        try {
            FileWriter fileWriter = new FileWriter("out.txt");
            for (int i = 0; i < size; i++) {
                fileWriter.write(parkingInfoList[i].getParkingNumber() + " ");
                fileWriter.write(parkingInfoList[i].getOwnerName() + " ");
                fileWriter.write(parkingInfoList[i].getGender() + " ");
                fileWriter.write(parkingInfoList[i].getAge() + " ");
                fileWriter.write(parkingInfoList[i].getCarNumber() + "\n");
            }
            fileWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 从文件中读取数据
    public void readFromFile() {
        try {
            BufferedReader bufferedReader = new BufferedReader(new FileReader("out.txt"));
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                String[] splitLine = line.split(" ");
                ParkingInfo parkingInfo = new ParkingInfo(Integer.parseInt(splitLine[0]), splitLine[1], splitLine[2], Integer.parseInt(splitLine[3]), splitLine[4]);
                addParkingInfo(parkingInfo);
            }
            bufferedReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

最后，我们可以在主函数中测试我们的停车场信息管理系统。代码如下：

public class Main {
    public static void main(String[] args) {
        ParkingManagementSystem parkingManagementSystem = new ParkingManagementSystem();

        // 增加停车信息
        ParkingInfo parkingInfo1 = new ParkingInfo(1, "张三", "男", 30, "粤A12345");
        ParkingInfo parkingInfo2 = new ParkingInfo(2, "李四", "女", 25, "粤B23456");
        ParkingInfo parkingInfo3 = new ParkingInfo(3, "王五", "男", 35, "粤C34567");
        parkingManagementSystem.addParkingInfo(parkingInfo1);
        parkingManagementSystem.addParkingInfo(parkingInfo2);
        parkingManagementSystem.addParkingInfo(parkingInfo3);

        // 删除停车信息
        parkingManagementSystem.deleteParkingInfo(2);

        // 修改停车信息
        ParkingInfo newParkingInfo = new ParkingInfo(1, "张三", "男", 30, "粤D45678");
        parkingManagementSystem.modifyParkingInfo(1, newParkingInfo);

        // 查找停车信息
        ParkingInfo parkingInfo = parkingManagementSystem.searchParkingInfo(1);
        if (parkingInfo != null) {
            System.out.println(parkingInfo.getOwnerName() + " " + parkingInfo.getCarNumber());
        }

        // 输出到文件
        parkingManagementSystem.outputToFile();

        // 读取文件中的数据
        parkingManagementSystem.readFromFile();

        // 查看停车信息
        for (int i = 0; i < parkingManagementSystem.size; i++) {
            System.out.println(parkingManagementSystem.parkingInfoList[i].getOwnerName() + " " + parkingManagementSystem.parkingInfoList[i].getCarNumber());
        }
    }
}

以上就是用Java设计一个停车场信息管理系统的全部内容。