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Java Class


Writing a Custom Class :


Syntax of a custom class :

class <class_name>{  
    field;  
    method;  
}  


Example :
public class Employee {
	int id;			// Attribute 1
	String name;		// Attribute 2
}

Note: The first letter of a class should always be capital.

Any real-world object          = Properties + Behavior
Object in OOPs                 = Attributes + Methods

A Class with Methods :


We can add methods to our class Employee as follows:
public class Employee {
	public int id;
	public String name;

	public int getSalary(){
		//code
	}
	public void getDetails(){
		//code
	}
};

Examples


package com.company;

static class Employee{
    int id;
    int salary;
    String name;
    public void printDetails(){
        System.out.println("My id is " + id);
        System.out.println("and my name is "+ name);
    }

    public int getSalary(){
        return salary;
    }
}

public class custom_class {
    public static void main(String[] args) {
        System.out.println("This is our custom class");
        Employee harry = new Employee(); // Instantiating a new Employee Object
        Employee john = new Employee(); // Instantiating a new Employee Object

        // Setting Attributes for Harry
        harry.id = 12;
        harry.salary = 34;
        harry.name = "CodeWithHarry";

        // Setting Attributes for John
        john.id = 17;
        john.salary = 12;
        john.name = "John Khandelwal";

        // Printing the Attributes
        harry.printDetails();
        john.printDetails();
        int salary = john.getSalary();
        System.out.println(salary);
        
    }
}

Output

This is our custom class
My id is 12
and my name is CodeWithHarry
My id is 17
and my name is John Khandelwal
12


Conclusion

In this page (written and validated by ) you learned about Java Class . What's Next? If you are interested in completing Java tutorial, your next topic will be learning about: Java Access modifiers getters and setters in Java.



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