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A class is a template. An object of a class fills out the template with specific values. If you have a class Pizza (size, toppings) you can create an object pizza1 of type Pizza, meaning you use the constructor to fill in all the values a concrete Pizza needs: Pizza(size=30, toppings=[cheese,ham]). It is important to notice that this object represents exactly this one pizza. Manipulating this object has no effects on other objects of types pizza. If you do pizza1.eatPieces(2), pizza1 will have 2 pieces less, but pizza2 or any other objects still have all pieces Answer from Acceptable-War-6423 on reddit.com

Oracle

docs.oracle.com › javase › 8 › docs › api › java › lang › Object.html

Object (Java Platform SE 8 )

October 20, 2025 - Java™ Platform Standard Ed. 8 ... Class Object is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the methods of this class.

reddit.com › r/learnprogramming › classes, objects, and methods...still confused

r/learnprogramming on Reddit: Classes, Objects, and Methods...Still Confused

September 26, 2018 -

I have started teaching myself Java but I still have this nagging issue where I am not 100% understanding these concepts. I have read multiple threads, subs, and user explanations but am still so slow at picking up this concept. I think I understand the following:

A class is a blueprint

A method is a function(action) within a class

An object is a specific instance of that blueprint, (can contain multiple methods).

Here is the basic issue I am having, (I feel like it is a really dumb hang-up):

I use Eclipse to create a project by selecting File/New Java Project and name it LunchOrder.

With my newly created project selected, I select New/Class to start writing my code. I name that class LunchOrder and start coding, (I would probably also create a LunchOrderRunner class that would accept methods passed from the LunchOrder sub class).

That .java file that is created is called a class...but I can have multiple "classes" within that .java file. How can I have a bunch of classes within a class? I really feel like that .java...thing...should be called something else. How can it be a class?

I really hope someone out there understands my confusion. Please help.

Top answer

1 of 5

Each .java file can (and must) contain only one public class. Public means that it can be used from other files. You can also have non-public classes that are only usable in the file where you defined them. That .java file that is created is called a class It contains a class definition, but the file itself is not a class. I can see how it's a little confusing because of the "one file = one public class" rule that I explained above. I don't think any other programming language works like that.

2 of 5

A .class file is created by compiling those .java files. People who use your application won't be to see the .java files (the code you wrote to create the application). I wouldn't worry too much about the .class files tbh.. What you said about objects having multiple methods, the same obviously goes for classes. The instance of those classes (objects) will have the methods that the class defines.

Videos

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YouTube

Java Classes & Objects - YouTube

Object & Instance Methods | Java | Tutorial 30 - YouTube

# 42 What is an Object class and it's methods in Java?| Object ...

Java Tutorial 5 - Methods, Classes, and Objects Explained

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#22 Class and Object Practical in Java - YouTube

January 18, 2023

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2 of 14

An object is an instance of a class. A constructor builds an object according to the class definition, which will indicate the properties and methods associated with the class.

Scaler

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Object Class in Java - Scaler Topics

March 21, 2024 - If a class doesn't extend any other class, it's a direct child of Object; if it extends another class, it's indirectly derived. Consequently, all Java classes inherit the methods of the Object class, making it the cornerstone of inheritance hierarchy in Java programs.

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W3Schools

w3schools.com › java › java_class_methods.asp

Java Class Methods

The dot (.) is used to access the object's attributes and methods. To call a method in Java, write the method name followed by a set of parentheses (), followed by a semicolon (;).

Sololearn

sololearn.com › en › Discuss › 2030165 › what-is-the-difference-between-a-method-and-an-object-java

What is the difference between a method and an object? (JAVA) | Sololearn: Learn to code for FREE!

October 9, 2019 - Methods are parts of Classes. If you create an instance of a class you have an Object. Know you can call the methods from this class. If the class have one. If you scroll down you see the page for methods. https://www.sololearn.com/learn/Java/2151/?ref=app

Upgrad

upgrad.com › home › tutorials › software & tech › object class in java

Object Class in Java – Methods and Examples

May 19, 2025 - The class also provides methods related to concurrency, object cloning, and garbage collection. Since every Java class is a descendant of the Object class, the methods defined in it are inherited by all classes. This makes the Object class the backbone of object management in Java.

Medium

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Understanding the Object Class in Java | by Vicksheet Shanbhag | Medium

March 20, 2024 - In Java, every class is implicitly a subclass of the Object class. The Object class is the root of the class hierarchy, and it defines the behavior that is common to all objects. Even if you don’t explicitly extend the Object class, your class automatically inherits its methods and fields.

GeeksforGeeks

geeksforgeeks.org › java › classes-objects-java

Classes and Objects in Java - GeeksforGeeks

10:37

Explanation: Here, creates a new Geeks object g2 by cloning the existing object g1 using the overridden clone() method. The cloned object copies the field values of g1, which is confirmed by printing g2.name. De-serialization is a technique of reading an object from the saved state in a file. Object is recreated from a stored byte stream. ... import java.io.*; class Student implements Serializable { private String name; public Student(String name) { this.name = name; } public String toString() { return "Student: " + name; } } public class Main { public static void main(String[] args) { try (Ob

Published January 20, 2026

Oracle

docs.oracle.com › javase › 8 › docs › api › java › lang › reflect › Method.html

Method (Java Platform SE 8 )

October 20, 2025 - Returns the name of the method represented by this Method object, as a String. ... Returns the Java language modifiers for the executable represented by this object.

Slainstitute

slainstitute.com › object-methods-in-java

What are the Object Class Methods in Java?

January 20, 2025 - In Java, the Object class serves as the parent for all classes, providing the basis for inheriting traits. Every Java class, whether directly or indirectly, is associated with the Object class in the java.lang package. This connection is essential for Object class methods in Java, establishing how different classes share common behaviors.

Tutorialspoint

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Java Object Classes

September 1, 2008 - So, in software development, methods operate on the internal state of an object, and the object-to-object communication is done via methods. As mentioned previously, a class provides the blueprints for objects. So basically, an object is created from a class. In Java, the new keyword is used to create new objects.

Oracle

docs.oracle.com › javase › 8 › docs › api › java › util › Objects.html

Objects (Java Platform SE 8 )

October 20, 2025 - Java™ Platform Standard Ed. 8 ... This class consists of static utility methods for operating on objects.

Stack Overflow

stackoverflow.com › questions › 9864300 › how-to-get-method-object-in-java-without-using-method-string-names

reflection - How to get Method object in Java without using method string names - Stack Overflow

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Java 8 method references would be ideal for this - the tricky part is getting to the underlying method, because the method reference syntax itself results in an opaque lambda object.

Found this after a bit of searching:

http://benjiweber.co.uk/blog/2013/12/28/typesafe-database-interaction-with-java-8/

Neat trick - call the method on a proxy object that records the method name. Haven't tried it but looks promising.

2 of 8

In your method call: Method me = (new MethodNameHelper(){}).getMethod();

/**
 * Proper use of this class is
 *     Method me = (new MethodNameHelper(){}).getMethod();
 * the anonymous class allows easy access to the method name of the enclosing scope.
 */
public class MethodNameHelper {
  public Method getMethod() {
    return this.getClass().getEnclosingMethod();
  }
}

DataCamp

datacamp.com › doc › java › class-methods

Java Class Methods

Java keywordsIntroduction To JavaJava File HandlingJava Language BasicsJava ArraysJava Object-Oriented Programming ... In Java, class methods are functions defined within a class that describe the behaviors or actions that objects of the class can perform. These methods can manipulate object ...

Stack Overflow

stackoverflow.com › questions › 78175309 › method-definition-and-objects-in-java

class - Method definition and objects in Java - Stack Overflow

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1 of 1

Interesting question. Computer memory within a single running program is one big pool. And all your code resides within a single copy. No, your individual threads do not get their own copies. For that matter, they don't get their own copies of your data, either, unless you create new objects within the thread and don't let anyone else have them.

It's safe, though, because the code is static and isn't going to get modified. Variables your methods use will be unique and safe, though. So if you do this:

public void foo() {
    int value = 10;
}

Then everyone running foo will have their own version of value. For that matter, if foo recurses (calls itself), then you now have two copies of value -- one in the first invocation and a different one in the second.

Programiz

programiz.com › java-programming › library › object

Java Object Methods | Programiz

Java Object is the superclass for all the classes in Java. All the methods of Object class can be used by all the subclasses and arrays. The Object class provides different methods to perform different operations on objects. In this reference page, you will find all the Object methods available in Java.

Codecademy

codecademy.com › learn › apcs-object-oriented-programming › modules › apcs-what-are-classes-objects-and-methods › cheatsheet

Object-Oriented Programming: What Are Classes, Objects, and Methods? Cheatsheet | Codecademy

In Java, instances of a class are known as objects. Every object has state and behavior in the form of instance fields and methods respectively.