method invoking refers to the action in which we call a Java method from within another java method or class.
Method invocation is analogous to a function call in procedural programming.
The virtual method invocation is a little tricky to explain. But I rather show you an example. Suppose you have a super class like this:
public class Super{
public int number = 1;
public String getColor(){
return "red";
}
}
and now we have a subclass of Super:
public class Sub extends Super{
public int number = 2;
public String getColor(){
return "blue";
}
}
All right, so what is the out put of the next program?
public static void main(String[] args){
Super supersub = new Sub(); //You can do this thanks polymorphism
System.out.println( supersub.getColor() + supersub.number );
}
The output could be "blue2" or maybe "red1". Nooo, the real input is "blue1" and this is due the virtual method invocation. Let me explain it better, you are using a variable of the 'Super' type, but you store there a 'Sub' object instead, the output must be either of the two that I predict before, but the java is capable of track in run time the real method implementation that you are using ("the one that return blue") but it can do the same with your object variable.
A Method definition in Java needs the below info:
Ex:
public String getName(int empId) {}
here
object.method();
No, Java only allows a method to be defined within a class, not within another method.
java exception
The getContentPane() method is used to get the main component in a Java Swing JFrame. It is usually a JPanel.
native is a key word used in java method. there is no variable as native in java
A void method is one that returns no value. The Java main() method is the first method to be called, therefore it doesn't need to return a value to another Java method, therefore it is declared as void. If something needs to be returned to the operating system, this is done differently, not by "returning a value" in the sense of Java.
Virtual method invocation is a term borrowed from C++. It means that methods are invoked polymorphically. Instead of invoking the method in the compile-time type, the method is invoked as its runtime type. In C++, you declare methods virtual that are executed this way.
The presence of the keywords "throws exception" on a method signature means that, the method may throw an exception whhich it does not handle. It also means that the method that is calling or invoking it has to handle such exceptions. If the calling method does not handle that exception it would have to in turn use the same "throws exception" clause and throw it to its parent method.
There is no such thing as overlording in Java.
It is the method that gets called when a Java application is started.
No, Java only allows a method to be defined within a class, not within another method.
In Java, a function is called a "method". In Java as well as other languages, a method is a function defined specifically for one class. In Java, this is the only way to define functions, therefore, all functions are methods.In Java, a function is called a "method". In Java as well as other languages, a method is a function defined specifically for one class. In Java, this is the only way to define functions, therefore, all functions are methods.In Java, a function is called a "method". In Java as well as other languages, a method is a function defined specifically for one class. In Java, this is the only way to define functions, therefore, all functions are methods.In Java, a function is called a "method". In Java as well as other languages, a method is a function defined specifically for one class. In Java, this is the only way to define functions, therefore, all functions are methods.
You probably mean "System.out.println", which is a system method in Java that allows you to print text to the screen.
A Java method is a sequence of statements. It is comparable to a function, subroutine, or procedure in other languages.
java exception
The Java superclass Object says that all Java objects have an equals method. Thus Comparator has an equals method.
a method is a variable
The final and finally keywords have no impact on the return type of a method in Java.