Java OOPC - Object Generation, Data Types, Parameters and Arguments

 

    Object Generation






Object generation in java is the process of creating objects of a class. Using class reference and using class constructor object is generated .

They are created using the new keyword followed by a constructor.

We can create any number of object for specific class and there is no limit for it. Object add more reliable code.



public class ObjectGenerationExample {

    public static void main(String[] args) {

        // Creating objects

        Car car1 = new Car();

        Car car2 = new Car();

 

        // Using objects

        car1.displayInfo();

        car2.displayInfo();

    }

}

 Data Types


Java is a statically-typed programming language, which means that the data types of variables must be explicitly declared before using it. Understanding the various data types available in the Java help us to writing efficient and more correct errorless code.


Further, there are two main data types.

1.Primitive Data type

2.Reference Data type







 

1.Primitive Data type

 

Firstly, if we get primitive data type mainly there are eight data types. Those are Boolean, char, byte, short, int, long, float and double.


1. boolean type:

A boolean data type can only store True or False values.


2. byte type:

The smallest data type between all integer data types is the byte.


3. short type:

The short data type (16-bit signed two’s complement integer) can store whole numbers from -32768 to 32767.


4. int type:

The int data type (32-bit signed two’s complement integer) can store whole numbers from -2147483648 (-2^31) to 2147483647 (2^31 -1).


5. long type:

The longest data type among all integer data types is the long (64-bit two’s complement integer).


6. char type:

The char data type is a single 16-bit Unicode character and is used to store a single character. It stores both lower case and upper case characters which must be enclosed in single quotes.


7. float type:

It is a form of floating-point data that stores values with decimal precision.


8. double type:

The double data type resembles the float data type.






2.Reference Data type


Non-primitive data types are called reference types because they refer to objects.

Arrays, class ,interface, string, Enum are the reference data types, and if we consider about the interface it similar to class. String ,Enum are classes and String we used as a data type.

 

                 Java Parameters and arguments.


Parameters in Java


Parameters act as placeholders for valus that will  be provide when the method is called. Parameters define the input that a method expects to receive.

Here’s  an example of a method with parameters:

 

public class ParameterExample {

    // Method with two parameters

    public static void printSum(int a, int b) {

        int sum = a + b;

        System.out.println("Sum: " + sum);

    }

 

    public static void main(String[] args) {

        // Calling the method with arguments

        printSum(5, 7);

    }

}

 

 

 

Arguments in java


Arguments are the actual values passed to a method when it is called. They match the data types and order of the parameters defined in the method. When a method is called, the values provided as arguments are assigned to the corresponding parameters within the method body.

 

According to the above example, printSum(5,7) ,the values 5,7 are arguments. They are passed to the parameters a and b when the printSum method is invoked.

 

printSum(5, 7); // 5 and 7 are arguments

 

Some facts about the parameters and arguments:


-   A method must include a return type.

-   When, Method type is void(Default), from that we can return any data type, but when data type  become a return type that data type only returned. Also It takes that data types only.

 




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