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What is dynamic method dispatch in java?
Dynamic Method Dispatch in Java is when a method call is resolved at runtime based on the actual object the reference points to. For example, if a parent class has a method and a child class overrides it, a parent reference pointing to a child object will execute the child’s version of the method. This allows Java to decide which method to run during execution, enabling runtime polymorphism. To dive deeper into this topic, visit the Uncodemy blog for detailed insights.
Can an object have several different classes?
Inheriting multiple base classes is not allowed in Java. If you are curious asking me why doesn't java allow multiple inheritance, think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below: Public class FerrariF12011 extends Ferrari, Car, Automobile {…} And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature.
What does import javax.swing.jaframe mean?
Its a Java programming language call to include a method called Jaframe which is is the Javax.Swing class Library.
Can you refer non static method from static content in java?
Shortly, you can not.Different approaches are however available.1. Put your non static method in different class. Then call it from your static content by first instantiating the class.2. Make a duplicate static method for your non static method and use from your static content.
Can you call an abstract method from a non abstract method in java?
We can't call (i.e, execute) an abstract method in java because these methods don't contain any code to execute!In some special cases like when an abstract method is overridden in a subclass, and when we are using super class reference variable( which is referring that subclass object), it appears that we are calling abstract method in super class. But actually the code in the subclass method is being executed.Example:abstract class SuperClass{abstract void show(); //abstract method in super class}class SubClass extends SuperClass{void show(){ //show() of SuperClass overridden in SubClassSystem.out.println("SubClass Method");}}class Example{public static void main(String... args){SuperClass sup=new SubClass();sup.show(); //SubClass show() will be executed !!!}}
How do you call main class with in main class in java?
We can't call a class. We always call a method in java.
What is method call in java?
Calling a method in Java is when you run code associated with a specific class, using the name of an instance object of a class, followed by the dot operator, followed by the name of the method, followed by the arguments of the method, enclosed in parentheses.
How do you call a method in Java?
It's when you take a object and run some code in the class of that object.
How do you call a method from inside the main method?
I assume the question is about Java. How you call a method from inside the main method depends on whether this is an instance method or a static method. To call an instance method, you need to have a valid instance. Say foo is an instance of class Foo, which was created inside the main method. Then to call the instance method implode() use foo.implode() To call the static method bar() of class Foo, use Foo.bar().
Is it possible to override the main method in Java?
Theoretically yes. You will use only one main method for your whole java application and hence such a situation will not come up in real life. Imagine: You have a main in class A and one more in class B which extends class A. When you try to run the class B, only that main method will be executed and not the main in class A. So this override is irrelevant and we cannot call class A's main method at all
What is dynamic method dispatch in java?
Dynamic Method Dispatch in Java is when a method call is resolved at runtime based on the actual object the reference points to. For example, if a parent class has a method and a child class overrides it, a parent reference pointing to a child object will execute the child’s version of the method. This allows Java to decide which method to run during execution, enabling runtime polymorphism. To dive deeper into this topic, visit the Uncodemy blog for detailed insights.
Why multiple inheritance is not used in java?
If you are curious asking me why doesn't java allow multiple inheritance, think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below: Public class FerrariF12011 extends Ferrari, Car, Automobile {…} And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature.
Can an object have several different classes?
Inheriting multiple base classes is not allowed in Java. If you are curious asking me why doesn't java allow multiple inheritance, think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below: Public class FerrariF12011 extends Ferrari, Car, Automobile {…} And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature.
What does import javax.swing.jaframe mean?
Its a Java programming language call to include a method called Jaframe which is is the Javax.Swing class Library.
Why multiple inheritance not in java?
think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below: Public class FerrariF12011 extends Ferrari, Car, Automobile {…} And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature.
What are the inconsistencies of using multiple inheritace in java?
If you are curious asking me why doesn't java allow multiple inheritance, think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below: Public class FerrariF12011 extends Ferrari, Car, Automobile {…} And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature.
Why java doesn't support multiple inheritance and pointers concept?
think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below: Public class FerrariF12011 extends Ferrari, Car, Automobile {…} And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature. Similarly, Pointers is where most C programmers make catastrophic errors and the creators of Java thought that the job of messing with memory locations is better left to the experts and hence there is no pointers in java
