Rozwiązanie krok po kroku: Notatki konsolowe i mobilne (Java + Android)

public class Main {
    public static void main(String[] args) {
    }
}

public class Notatka {
    private static int counter = 0;
    private int id;
    protected String title;
    protected String content;
}

public class Notatka {
    private static int counter = 0;
    private int id;
    protected String title;
    protected String content;

    public Notatka(String title, String content) {
        counter++;
        id = counter;
        this.title = title;
        this.content = content;
    }
}

public class Notatka {
    private static int counter = 0;
    private int id;
    protected String title;
    protected String content;

    public Notatka(String title, String content) {
        counter++;
        id = counter;
        this.title = title;
        this.content = content;
    }

    public void show() {
        System.out.println("Tytuł: " + title);
        System.out.println("Treść: " + content);
    }
}

public class Notatka {
    private static int counter = 0;
    private int id;
    protected String title;
    protected String content;

    public Notatka(String title, String content) {
        counter++;
        id = counter;
        this.title = title;
        this.content = content;
    }

    public void show() {
        System.out.println("Tytuł: " + title);
        System.out.println("Treść: " + content);
    }

    public void showDiagnostics() {
        System.out.println("Diagnostyka: " + counter + ";" + id + ";" + title + ";" + content);
    }
}

public class Main {
    public static void main(String[] args) {
        Notatka shopping = new Notatka("Zakupy", "chleb, masło, ser");
        shopping.show();
        shopping.showDiagnostics();
    }
}

public class Main {
    public static void main(String[] args) {
        Notatka shopping = new Notatka("Zakupy", "chleb, masło, ser");
        shopping.show();
        shopping.showDiagnostics();
        System.out.println();

        Notatka todo = new Notatka("Do zrobienia", "obiad, umyć podłogi");
        todo.show();
        todo.showDiagnostics();
    }
}

package com.example.notatki;

import android.os.Bundle;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/noteInput"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Nowy element"
            android:inputType="text" />

    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/noteInput"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Nowy element"
            android:inputType="text" />

        <Button
            android:id="@+id/addButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:backgroundTint="#DC143C"
            android:text="DODAJ"
            android:textColor="#FFFFFF" />

    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/noteInput"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Nowy element"
            android:inputType="text" />

        <Button
            android:id="@+id/addButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:backgroundTint="#DC143C"
            android:text="DODAJ"
            android:textColor="#FFFFFF" />

    </LinearLayout>

    <ListView
        android:id="@+id/notesList"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

package com.example.notatki;

import android.os.Bundle;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;
import java.util.Arrays;

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> notes;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes = new ArrayList<>(Arrays.asList(
                "Zakupy: chleb, masło, ser",
                "Do zrobienia: obiad, umyć podłogi",
                "weekend: kino, spacer z psem"));
    }
}

package com.example.notatki;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;
import java.util.Arrays;

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> notes;
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes = new ArrayList<>(Arrays.asList(
                "Zakupy: chleb, masło, ser",
                "Do zrobienia: obiad, umyć podłogi",
                "weekend: kino, spacer z psem"));
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, notes);
        ListView notesList = findViewById(R.id.notesList);
        notesList.setAdapter(adapter);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/noteInput"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Nowy element"
            android:inputType="text" />

        <Button
            android:id="@+id/addButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:backgroundTint="#DC143C"
            android:text="DODAJ"
            android:textColor="#FFFFFF" />

    </LinearLayout>

    <ListView
        android:id="@+id/notesList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="#DC143C"
        android:dividerHeight="2dp" />

</LinearLayout>

package com.example.notatki;

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;
import java.util.Arrays;

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> notes;
    private ArrayAdapter<String> adapter;
    private EditText noteInput;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes = new ArrayList<>(Arrays.asList(
                "Zakupy: chleb, masło, ser",
                "Do zrobienia: obiad, umyć podłogi",
                "weekend: kino, spacer z psem"));
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, notes);
        ListView notesList = findViewById(R.id.notesList);
        notesList.setAdapter(adapter);
        noteInput = findViewById(R.id.noteInput);
    }

    public void addNote(View view) {
        notes.add(noteInput.getText().toString());
        adapter.notifyDataSetChanged();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/noteInput"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Nowy element"
            android:inputType="text" />

        <Button
            android:id="@+id/addButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:backgroundTint="#DC143C"
            android:onClick="addNote"
            android:text="DODAJ"
            android:textColor="#FFFFFF" />

    </LinearLayout>

    <ListView
        android:id="@+id/notesList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="#DC143C"
        android:dividerHeight="2dp" />

</LinearLayout>

/*
 ******************************************************
  klasa:  Notatka
  opis:   reprezentuje notatkę z tytułem i treścią; każda utworzona
          notatka dostaje kolejny identyfikator, a klasa zlicza notatki
  pola:   counter - liczba utworzonych notatek, wspólna dla wszystkich obiektów
          id - unikalny identyfikator notatki (1 dla pierwszej, 2 dla drugiej...)
          title - tytuł notatki
          content - treść notatki
  autor:  Bartosz Bryniarski
 ******************************************************
 */
public class Notatka {
    private static int counter = 0;
    private int id;
    protected String title;
    protected String content;

    public Notatka(String title, String content) {
        counter++;
        id = counter;
        this.title = title;
        this.content = content;
    }

    public void show() {
        System.out.println("Tytuł: " + title);
        System.out.println("Treść: " + content);
    }

    public void showDiagnostics() {
        System.out.println("Diagnostyka: " + counter + ";" + id + ";" + title + ";" + content);
    }
}

Zrzuty ekranu: konsola1 - wynik programu; mobile1 - stan początkowy; mobile2 - w trakcie pisania; mobile3 - po dodaniu notatki
System operacyjny: Windows 11
Środowiska programistyczne: IntelliJ IDEA (aplikacja konsolowa), Android Studio (aplikacja mobilna)
Emulator: Pixel 8 (Android 16, API 36) z Android Studio
Języki programowania: Java (aplikacja konsolowa i mobilna), XML (układ aplikacji mobilnej)

/*
 ******************************************************
  klasa:  Notatka
  opis:   reprezentuje notatkę z tytułem i treścią; każda utworzona
          notatka dostaje kolejny identyfikator, a klasa zlicza notatki
  pola:   counter - liczba utworzonych notatek, wspólna dla wszystkich obiektów
          id - unikalny identyfikator notatki (1 dla pierwszej, 2 dla drugiej...)
          title - tytuł notatki
          content - treść notatki
  autor:  Bartosz Bryniarski
 ******************************************************
 */
public class Notatka {
    private static int counter = 0;
    private final int id;
    protected String title;
    protected String content;

    public Notatka(String title, String content) {
        counter++;
        id = counter;
        this.title = title;
        this.content = content;
    }

    public void show() {
        System.out.println("Tytuł: " + title);
        System.out.println("Treść: " + content);
    }

    public void showDiagnostics() {
        System.out.println("Diagnostyka: " + counter + ";" + id + ";" + title + ";" + content);
    }
}

package com.example.notatki;

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;
import java.util.Arrays;

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> notes;
    private ArrayAdapter<String> adapter;
    private EditText noteInput;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes = new ArrayList<>(Arrays.asList(
                "Zakupy: chleb, masło, ser",
                "Do zrobienia: obiad, umyć podłogi",
                "weekend: kino, spacer z psem"));
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, notes);
        ListView notesList = findViewById(R.id.notesList);
        notesList.setAdapter(adapter);
        noteInput = findViewById(R.id.noteInput);
    }

    public void addNote(View view) {
        String text = noteInput.getText().toString().trim();
        if (text.isEmpty()) {
            return;
        }
        notes.add(text);
        adapter.notifyDataSetChanged();
        noteInput.setText("");
    }
}