The keyword super is used to refer to the parent class instance of the current class.
Lets say we have a class
class A extends B {
...
public void getName(){
}
...
}
Lets assume the parent class B also has a method getName()
Inside class A if you call getName() it would by default call the current class's method. To make the JVM intentionally call the super class method we can use super
if we say super.getName() then the parent class instance of the method would be called.
super keyword is used for two reasons:
1. To Call the super class or base class constructor
2.To call super class methods.
If you don't create constructor in a class...Java automatically put for you.
Always remember..that the first statement in derived class constructor must be a call to super or this.
The super keyword is used to refer to the superclass of the current class. Common uses include when extending from a Component. The paint() method may need to be overridden, but the parent's paint method still needs to be called.
class MyFrame extends JFrame() {
public void paint(Graphics g) {
super.paint(g);
// do our specialized paint here
}
}
Super refers to the parent class object instance. In case of static methods, they do not belong to any object instance and hence they cannot call anything related to the parent class instance.
These are two different things.
"Super" is used in inheritance - if class B inherits from class A, and we want the constructor of B to do the same things the constructor of A does (and maybe more things), we can call A's constructor in B's constructor:
public B() {
super();
......
}
Notice that it must be the first line in B's constructor.
"This" is used in case of overloading, to call a function aith the same name.
For example, if we have a constructor that receives one argument, and we it want to have a default value of 0, we can write:
public C() {
this(0);
}
"super " is a key word in java. this is used for referring to super class members ( variables and methods ) from subclass .( when sub class and super class have members with same names).
Super refers to the base class of your object. For example, if you have a class named Foo...
@Override
public String getClassName()
{
String thisClass = "Foo";
String baseClass = super.getClassName();
return thisClass + ", which derives from " + baseClass;
}
...which derives from base class Bar...
public String getClassName()
{
return "Bar";
}
... calling Bar.getClassName would print "Bar", while calling Foo.getClassName would print "Foo, which derives from Bar".
super is a keyword in java.uses of super are:
1.it is used to call super class constructor.
2.It is used to call a method of super class that is hidden by sub-class.
Java 7 is the most current version of Java. Many movies and games use Java.
Not usually. There are numerous languages out there with similar functionality. The only time you must use Java is if your employer or client demands that a project be done in Java, or a particular platform requires the use of Java, such as Android OS.
Java doesn't use header files.
Yes, it is possible to write a keylogger in Java, but you would need to use the Java Native Interface to do so.
to connect java and data base...use connection stament
Java does not support Pointers and hence you cannot use it in Java.
It's part of the language specification that all objects in Java must inherit from Object. Java defines a strict class hierarchy, and enforcing a "super most class" ensures that this ordering is maintained.
Java is exclusive to surfing the web. Some web sites use Java to embed videos, others use Java for advertisements.
No
Java does not have pointers
Java 7 is the most current version of Java. Many movies and games use Java.
You can use Head First Java or Java Complete Reference to learn Java.
When any constructor is deffined in your class, the java compiler create a default no argument constructor for you. This constructor only have an invocation to the super class constructor (" super( ) ").
Many programs use those keywords.super refers to the direct superclass of the class referencing itfinal declares a variable or class unchangable
Not usually. There are numerous languages out there with similar functionality. The only time you must use Java is if your employer or client demands that a project be done in Java, or a particular platform requires the use of Java, such as Android OS.
RuneScape bots use Java. Use a Java Binary Code.
Many reasons, one of them: there is no 'clrscr' in Java.