BC CREATIONOBJECTJAVA

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Vikas Rajput
@vikasrajputin 1 year, 9 months ago 156 views

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Five Different Ways to Create Objects in Java

a thread...

1. Using a new keyword.

It's the most popular one. We create an object by using a new operator followed by a constructor call.

Eg:

2. Using the newInstance() method of class "Class":

Eg:

3️. Using the newInstance() method in class "Constructor":

Eg:

Note:

Both the above ways (Shown in 2 and 3),
are known as reflective ways of creating objects.

Fun-fact:

Class's newInstance() method internally uses Constructor's newInstance() method.

4️. Using "Object" class clone() method

The clone() method creates a copy of an existing object.

The clone() method is part of the "Object" class which returns a clone object.

Eg:

When using the clone() method:

Always Remember,

1. The "Cloneable" interface is implemented.
2. The clone() method must be overridden with other classes.
3. Inside the clone() method, the class must call super.clone().

5️. Using Deserialization:

When we deserialize any object then JVM creates a new object internally.

For this, we need to implement the Serializable interface.

Eg:

Conclusion:

We've seen all five ways to create Objects in Java:

1. Using a new keyword.
2. Using Class.newInstance() method
3️. Using Constructor.newInstance() method
4️. Using Object.clone() method
5️. Using Deserialization

Thanks for reading!

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Streams are a way to perform operations on the whole collection of data.

Stream never modifies the source data, it processes it and gives us the result without modifying the original data.

Let's see few popular ways to create stream:

1. Collection. stream()
2. Stream.of(T... values)
3. Arrays. stream()
4. Stream.builder()

Eg:️

Consider stream as a pipeline, where we perform mainly two different operations on the source data:

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2. Terminal Operations(TO)

Here's what the stream pipeline looks like:

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a thread...

Multithreading is a concept of applying multitasking in Java.

Java supports thread-based multitasking.

Java program can be divided into several threads and those threads can be executed in parallel to support multi-tasking.

Two ways to create a thread in Java:

1. By Implementing Runnable Interface
2. By extending the Thread class

Let's create a thread by implementing the "Runnable" interface:

Steps:
1. Implement Runnable Interface
2. Override the run() method, and put your code inside it.
3. Pass the instance of your class to the Thread class constructor.
4. Call the start() method to run your thread.

Let's create a thread by extending the "Thread" class:

Steps:
1. Extend your class with Thread class
2. Override the run() method, and put your code inside it.
3. Instantiate your class.
4. Call the start() method to run your thread.

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What is an access modifier?

Access Modifiers are a way of providing limited visibility to methods, variables, classes.

Different access modifiers provide different visibility due to which our program because less prone to unwanted changes.

Java has four access modifiers, let's see each one by one

public:
It's the least restrictive access modifier when any class, method, or variable is defined as public then it is accessible from anywhere.

protected:
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default:
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private:
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Core Java can be Overwhelming, in the beginning!

Let's see what are those topics you should cover and what you can skip in Core Java.

1. Theoretical Concepts (2 days)

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- JVM, JRE & JDK
- Memory areas in Java
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- Polymorphism
- Encapsulation

This topic forms the basis of your Java learning. Spent enough time on this topic and understanding it using real-world examples and some

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தொல்லை இரும்பிறவிச் சூழும் தளை நீக்கி
அல்லல் அறுத்து ஆனந்தம் ஆக்கியதே – எல்லை
மருவா நெறியளிக்கும் வாதவூர் எங்கோன்
திருவாசகம் என்னும் தேன்

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4.அறியாமையாகிய இடரை (தளை)

5.அகற்றி (நீக்கி),

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8.பிறந்து இறக்கும் காலவெளிகளில் (எல்லை)

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