how to create a new class in java?

Question

Other than class Main if I create another class, how can I run that program?

Answer 1

Here is a simple example for you.

Main.java

public class Main
{
    public static void main(String[] args)
    {
        Person person = new Person("John Doe", 47);
        System.out.println(person.name + ", " + person.age);
    }
}

Person.java

public class Person
{
    public String name;
    public int age;
    
    public Person(String _name, int _age)
    {
        name = _name;
        age = _age;
    }
}

In Java, every class has to go to its own file (with the same name as the class itself).

To use code from your classes, you'll need to reference them from your main().

In the example above, the Person class is instantiated via the constructor. In the next line, we print out the fields held by the Person class.

One program can have only one entry point (main() function). If you want a different program, create a new project.

Answer 2

You can create just class without extension "public" and write all classes including main in one file .

Answer 3

Hello this is Gulshan Negi

Well, you can understand it with the help of below example:

public class MyClass {
    // Fields (variables)
    private int myField;

    // Constructor (optional)
    public MyClass(int initialValue) {
        myField = initialValue;
    }

    // Methods
    public void setMyField(int newValue) {
        myField = newValue;
    }

    public int getMyField() {
        return myField;
    }

    public static void main(String[] args) {
        // Create an instance of MyClass
        MyClass myInstance = new MyClass(42);

        // Call methods on the instance
        System.out.println("Initial value of myField: " + myInstance.getMyField());
        myInstance.setMyField(99);
        System.out.println("Updated value of myField: " + myInstance.getMyField());
    }
}

Thanks            

Answer 4

for making class in java you can simply open java editor and write class and give a space and enter class name which do you want to give.here is the example,
class AML
{
    public static void main(String[] args)
    {
        System.out.println("I HOPE YOU UNDERSTAND WHAT AM I TRYING TO SAY");
    }
}
Here  i used class name AML you can take it by your prefrence but remember always class name never strat with number or any signs
i hope you understand
                                                                   ~AML