sleep management software In Java.

Let's create a simple sleep management software in Java. This software will allow you to track your sleep duration, set sleep goals, and view sleep statistics. Here's an example implementation to get you started:

```java

import java.time.Duration;

import java.time.LocalDateTime;

import java.time.format.DateTimeFormatter;

import java.util.Scanner;

class SleepRecord {

    private LocalDateTime startTime;

    private LocalDateTime endTime;

    public SleepRecord(LocalDateTime startTime, LocalDateTime endTime) {

        this.startTime = startTime;

        this.endTime = endTime;

    }

    public LocalDateTime getStartTime() {

        return startTime;

    }

    public LocalDateTime getEndTime() {

        return endTime;

    }

    public Duration getSleepDuration() {

        return Duration.between(startTime, endTime);

    }

}

public class SleepManager {

    private SleepRecord currentSleepRecord;

    private Duration sleepGoal;

    private int totalSleepRecords;

    private Duration totalSleepDuration;

    public SleepManager() {

        this.currentSleepRecord = null;

        this.sleepGoal = Duration.ZERO;

        this.totalSleepRecords = 0;

        this.totalSleepDuration = Duration.ZERO;

    }

    public void setSleepGoal(Duration sleepGoal) {

        this.sleepGoal = sleepGoal;

        System.out.println("Sleep goal set: " + formatDuration(sleepGoal));

    }

    public void startSleep() {

        if (currentSleepRecord == null) {

            LocalDateTime startTime = LocalDateTime.now();

            currentSleepRecord = new SleepRecord(startTime, null);

            System.out.println("Sleep started at " + formatDateTime(startTime));

        } else {

            System.out.println("Sleep already in progress.");

        }

    }

    public void endSleep() {

        if (currentSleepRecord != null) {

            LocalDateTime endTime = LocalDateTime.now();

            currentSleepRecord = new SleepRecord(currentSleepRecord.getStartTime(), endTime);

            Duration sleepDuration = currentSleepRecord.getSleepDuration();

            totalSleepRecords++;

            totalSleepDuration = totalSleepDuration.plus(sleepDuration);

            System.out.println("Sleep ended at " + formatDateTime(endTime));

            System.out.println("Sleep duration: " + formatDuration(sleepDuration));

            currentSleepRecord = null;

        } else {

            System.out.println("No sleep in progress.");

        }

    }

    public void viewSleepStatistics() {

        System.out.println("Sleep Statistics:");

        System.out.println("Total sleep records: " + totalSleepRecords);

        System.out.println("Total sleep duration: " + formatDuration(totalSleepDuration));

        System.out.println("Sleep goal: " + formatDuration(sleepGoal));

    }

    private String formatDateTime(LocalDateTime dateTime) {

        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

        return dateTime.format(formatter);

    }

    private String formatDuration(Duration duration) {

        long hours = duration.toHours();

        long minutes = duration.toMinutesPart();

        return String.format("%02d:%02d", hours, minutes);

    }

    public static void main(String[] args) {

        SleepManager sleepManager = new SleepManager();

        Scanner scanner = new Scanner(System.in);

        while (true) {

            System.out.println("Sleep Manager");

            System.out.println("1. Set Sleep Goal");

            System.out.println("2. Start Sleep");

            System.out.println("3. End Sleep");

            System.out.println("4. View Sleep Statistics");

            System.out.println("5. Exit");

            System.out.print("Enter your choice: ");

            int choice = scanner.nextInt();

            scanner.nextLine(); // Consume newline

            switch (choice) {

                case 1:

                    System.out.print("Enter sleep goal (in hours and minutes, e.g., 7:30): ");

                    String sleepGoalInput = scanner.nextLine();