# Task

You are given a ``Parent`` class and a ``Child`` class that **inherits** from the ``Parent`` class. Your task is to **override** the parent method named ``method`` in the ``Child`` class so that it returns "*This is the overridden method!*".

Next, you need to **overload** this method by adding a parameter ``int parameter`` so that the method returns: "*This is the overloaded method with int parameter: " + parameter*.

Note that the methods should **return** these values, not display them on the screen!

Feel free to use the "`Hint`" and "`Solution`" buttons if you have difficulties understanding the task.




<link
  rel="stylesheet"
  href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.62.3/codemirror.min.css"
/>
<link
  rel="stylesheet"
  href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.62.3/theme/dracula.min.css"
/>


<link
  rel="stylesheet"
  href="https://content-media-cdn.codefinity.com/courses/c1087363-9025-4c37-8d5e-983a32a007e9/buttons-section/hint-solution-with-copyable-%26%3Dhighlighted-code.css"
/>

<div class="button-container">
  <button
    class="button"
    onclick="toggleBlock6('hint-block6', 'solution-block6')"
  >
    Hint
  </button>
  <button
    class="button"
    onclick="toggleBlock6('solution-block6', 'hint-block6')"
  >
    Solution
  </button>
</div>


<div id="hint-block6" class="block hint-styling-block">
  <li>
    Open the <b>src</b> folder, then open the
    <b>main/java/codefinity</b> package.
  </li>
  <li>
    There will be <code>Parent</code> and <code>Child</code> classes, open the
    <code>Child</code> class.
  </li>
  <li>Use the <code>@Override</code>.</li>
  <li>
    Use syntax: <code>return "This is the overridden method!";</code> for the
    first method.
  </li>
  <li>
    Overload this method by adding <code>int parameter</code> to the new one.
  </li>
  <li>
    Use syntax
    <code
      >return "This is the overloaded method with int parameter: " +
      parameter.</code
    >
    for the second method;
  </li>
  <li>Run tests by pressing the "<b>Run Code</b>" button.</li>
</div>

<div id="solution-block6" class="block solution-styling-block">
  
  <textarea id="code-6" class="language-java">
public class Child extends Parent {
    @Override
    public String method() {
        return "This is the overriden method!";
    }

    public String method(int parameter) {
        return "This is the overloaded method with int parameter: " + parameter;
    }
}</textarea
  >

  <button class="copy-button" onclick="handleClick6('code-6')">
    <svg
      width="20"
      height="20"
      x="0"
      y="0"
      viewBox="0 0 32 32"
      style="enable-background: new 0 0 512 512"
      xml:space="preserve"
      class=""
    >
      <g>
        <path
          d="m26.121 6.707-3.828-3.828A2.98 2.98 0 0 0 20.172 2H12a3.003 3.003 0 0 0-3 3v1H8a3.003 3.003 0 0 0-3 3v18a3.003 3.003 0 0 0 3 3h12a3.003 3.003 0 0 0 3-3v-1h1a3.003 3.003 0 0 0 3-3V8.829a2.982 2.982 0 0 0-.879-2.122ZM22 5.414 23.586 7H22ZM20 28H8a1.001 1.001 0 0 1-1-1V9a1.001 1.001 0 0 1 1-1h8v3a2.002 2.002 0 0 0 2 2h3v14a1 1 0 0 1-1 1ZM18 9.414 19.586 11H18ZM24 24h-1V12.829a2.982 2.982 0 0 0-.879-2.122l-3.828-3.828A2.98 2.98 0 0 0 16.171 6H11V5a1.001 1.001 0 0 1 1-1h8v3a2.002 2.002 0 0 0 2 2h3v14a1 1 0 0 1-1 1Zm-6-8h-8a1 1 0 0 1 0-2h8a1 1 0 0 1 0 2Zm0 4h-8a1 1 0 0 1 0-2h8a1 1 0 0 1 0 2Zm0 4h-8a1 1 0 0 1 0-2h8a1 1 0 0 1 0 2Z"
          fill="#a6b8e6"
          opacity="1"
          data-original="#000000"
          class=""
        ></path>
      </g>
    </svg>
  </button>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.62.3/codemirror.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.62.3/mode/clike/clike.min.js"></script>


<script src="https://cdn.jsdelivr.net/npm/notiflix@2.7.0/dist/notiflix-aio-2.7.0.min.js"></script>

<script>
  document.addEventListener("readystatechange", (event) => {
    if (event.target.readyState === "complete") {
      onPageLoad6();
    }
  });

  function onPageLoad6() {
    var editor = CodeMirror.fromTextArea(document.getElementById("code-6"), {
      lineNumbers: true,
      mode: "text/x-java",
      theme: "dracula",
    });

    // ----------> HIGHLIGHT <----------
    editor.markText(
      { line: 0, ch: 0 },
      { line: 0, ch: 0 },
      { className: "specific" }
    );

    editor.markText(
      { line: 0, ch: 0 },
      { line: 0, ch: 0 },
      { className: "specific" }
    );

    editor.markText(
      { line: 0, ch: 0 },
      { line: 0, ch: 0 },
      { className: "specific" }
    );

    editor.markText(
      { line: 0, ch: 0 },
      { line: 0, ch: 0 },
      { className: "specific" }
    );

    editor.markText(
      { line: 0, ch: 0 },
      { line: 0, ch: 0 },
      { className: "specific" }
    );

    // Initially hide both the hint and solution blocks
    hideBlock6("hint-block6");
    hideBlock6("solution-block6");
  }

  // Copy Button handler
  const handleClick6 = (codeBlock) => {
    const textarea = document.getElementById(codeBlock);
    const copiedText = textarea.value;

    navigator.clipboard.writeText(copiedText);

    Notiflix.Notify.Success("Copied to clipboard!", {
      timeout: 2000,
      width: "260px",
      position: "center-top",
      textColor: "#ff5549",
    });
  };

  // Function to toggle the visibility of a block
  const toggleBlock6 = (blockId) => {
    const block = document.getElementById(blockId);

    if (block.style.display === "none" || block.style.display === "") {
      hideBlock6("hint-block6");
      hideBlock6("solution-block6");
      showBlock6(blockId);
    } else {
      hideBlock6(blockId);
    }
  };

  // Function to show a block
  const showBlock6 = (blockId) => {
    const block = document.getElementById(blockId);
    block.style.display = "block";
  };

  // Function to hide a block
  const hideBlock6 = (blockId) => {
    const block = document.getElementById(blockId);
    block.style.display = "none";
  };
</script>

Those who know OOP can program well. That's what many programmers say. Get ready for an important part of your Java learning journey, mastering which will greatly boost your programming skills in general. You will learn how to effectively use the Java development environment, the principles of Object-Oriented Programming (OOP), and best practices in OOP. You will learn to make your code flexible and deepen your knowledge of previously covered topics. Let's get started!


Finally, we can start learning Object-Oriented Programming (OOP) in Java. It will be challenging, but I'm confident that you'll succeed! In this section, we'll cover all the principles of OOP, explain why OOP is important. You'll learn how to inherit classes, overload and override methods, encapsulate data from other classes, and work with abstraction. Moreover, you'll reinforce all these theoretical concepts with practical exercises, working on assignments in your IDE. You'll gain a wealth of knowledge, both practical and theoretical, so let's get started!

In the previous section, we concluded that all Object-Oriented Programming is mainly built on abstraction. However, an abstract class has one significant limitation – you can inherit from only one abstract class. But what if we need more?
Interfaces come to the rescue. In this section, you will learn what an interface is, why it's necessary, how to use it correctly, and you will continue practicing Object-Oriented Programming. Let's turn you into a professional!

Java OOP

Challenge: Polymorphism

Task