Java开发健康记录程序入门教程

public class HealthRecord {
    private String date;        // 记录日期
    private double weight;      // 体重（kg）
    private int systolic;       // 收缩压（高压）
    private int diastolic;      // 舒张压（低压）
    private int heartRate;      // 心率（次/分钟）

    public HealthRecord(String date, double weight, int systolic, int diastolic, int heartRate) {
        this.date = date;
        this.weight = weight;
        this.systolic = systolic;
        this.diastolic = diastolic;
        this.heartRate = heartRate;
    }

    // Getter 方法
    public String getDate() { return date; }
    public double getWeight() { return weight; }
    public int getSystolic() { return systolic; }
    public int getDiastolic() { return diastolic; }
    public int getHeartRate() { return heartRate; }

    @Override
    public String toString() {
        return "日期: " + date +
               " | 体重: " + weight + "kg" +
               " | 血压: " + systolic + "/" + diastolic +
               " | 心率: " + heartRate + "bpm";
    }
}

import java.util.*;

public class HealthTracker {
    private List records;
    private Scanner scanner;

    public HealthTracker() {
        records = new ArrayList();
        scanner = new Scanner(System.in);
    }

    public void start() {
        while (true) {
            showMenu();
            int choice = scanner.nextInt();
            scanner.nextLine(); // 消费换行符

            switch (choice) {
                case 1:
                    addRecord();
                    break;
                case 2:
                    viewAllRecords();
                    break;
                case 3:
                    searchByDate();
                    break;
                case 4:
                    System.out.println("退出程序。");
                    return;
                default:
                    System.out.println("无效选择，请重试。");
            }
        }
    }

    private void showMenu() {
        System.out.println("\n=== 健康记录小程序 ===");
        System.out.println("1. 添加健康记录");
        System.out.println("2. 查看所有记录");
        System.out.println("3. 按日期查询");
        System.out.println("4. 退出");
        System.out.print("请选择操作：");
    }

    private void addRecord() {
        System.out.print("输入日期 (如 2025-04-05): ");
        String date = scanner.nextLine();

        System.out.print("体重 (kg): ");
        double weight = scanner.nextDouble();

        System.out.print("收缩压 (高压): ");
        int sys = scanner.nextInt();

        System.out.print("舒张压 (低压): ");
        int dia = scanner.nextInt();

        System.out.print("心率 (bpm): ");
        int hr = scanner.nextInt();
        scanner.nextLine(); // 消费换行符

        records.add(new HealthRecord(date, weight, sys, dia, hr));
        System.out.println("记录已添加！");
    }

    private void viewAllRecords() {
        if (records.isEmpty()) {
            System.out.println("暂无记录。");
        } else {
            for (HealthRecord r : records) {
                System.out.println(r);
            }
        }
    }

    private void searchByDate() {
        System.out.print("输入要查询的日期: ");
        String date = scanner.nextLine();
        boolean found = false;

        for (HealthRecord r : records) {
            if (r.getDate().equals(date)) {
                System.out.println(r);
                found = true;
            }
        }

        if (!found) {
            System.out.println("未找到该日期的记录。");
        }
    }

    public static void main(String[] args) {
        new HealthTracker().start();
    }
}