Make an object by calling a method in java

Question

if we have MakeObject(String Name) and calling this method will create Object [Name] = new Object();
How can we do that? And, if we want to move the Object [Name] from the method to a public variable in class Clazz ?
Example:

public class clazz {
    void MakeObject(String name) {
        Object[name] = new Object();
        [name].UpgradeToClassVariable(); // It should be a global variable
    }
}

Usage of clazz :

public class main {
    public static void main(String[] args) {
        clazz c = new clazz();
        c.makeObject("Hello");
        c.Hello.doOperations(); // For example, if it's a String, doOperation() can be equals()
    }
}

Answer 1

In java, . is the dereference operator: Take the thing to the left of the 'dot'. This must be a reference. If it is a reference to nothing (null), a NullPointerException occurs.

The thing to the right is the message you send to it.

Thus, sending an object the message 'make yourself global' doesn't make any sense. Something like MyClass.makeGlobal([name]) would, but java doesn't support this.

A class's structure is defined at compile time. You cannot, at runtime, add properties, or change a field from being instance to static.

The general idea of 'I want to add a property' still exists, but, not at the level you're talking about. Perhaps you want a Map<String, Integer> for example.

Take your second snippet:

clazz c = new clazz();
c.makeObject("Hello");
c.Hello.doOperations(); // For example, if it's a String, doOperation() can be equals()

That's just not how java works. Java will first compile code ( javac ), and then run it. javac does not run any code , it only compiles it. Thus, javac sees c.Hello and stops you right there, and says: Hello? What? I have no idea what you're talking about.

That's why it is not possible to use a string literal to make a field like this.

Java isn't javascript, or python, or ruby.