What is a comparable interface – Coders can also order objects using java comparable interface. And rather than any type of class for that object. As a result, java uses user-defined class for this interface.
You can find java comparable interface inside the java.lang package since it is located inside that package. Therefore it contains only 1 method which seems like to be CompareTo(objects). Furthermore the interface provides single sorting element on a single data member only. So For an example it may be rollno, name, age or anything else.
compareTo(Object obj) method
Therefore to compare the current object with the specified object we used the syntax :
public int compareTo(Object obj)
Hence, Here is a list of what the element we can sort :
So from the last article I already explain to you what is a Data Structure in general and what is a Java Data Structure. Just like I promised in that craftingez6-coding post, within this 2 post I’ll explain to you the Java Data Structure (interface and classes) one by one.
Enumeration is a type of Interface, enumeration itself is not actually a data structure, but it surely is very very important to the context of the other data structures. The enumeration interface means to retrieve a successive elements from a data structure.
Enumeration could define a method called nextElement. And that method is used to get the next element inside the data structure that contains more than 1 elements.
BitSet is a type of class that implements a group of, guess what? “bits” or flags that you / the person can set and clear individually. This type of class is very useful in some cases where you need to keep up to code a set of Boolean values; you could just assign a bit to each value then set or clear it as appropriate
Vector class actually have similarities with a traditional Java array. Well except that Vector class can grow as necessary to accommodate new elements.
Just like an array, the elements that is inside the Vector object can be accessed via index into the vector. You know what, the nice thing about Vector is that you doesn’t have to worry anymore about setting the elements into a specific size upon creation, it’ll actually grows and shrinks automatically when it is necessary.
Stack class in java implements the last-in-first-out (LIFO) stack of elements. Imagine this illustration, you can imagine stack literally as a vertically stacked objects on top of each other.
When you add new objects, it will get stacked on top of the others (the last object).
Then, when you pull an element off from that stacked objects. The last object will be the first object to come back off again.
This dictionary doesn’t literally mean a dictionary, but it is rather an abstract class that defines data structure for mapping key to values. This kind class is useful whenever you want to access data via particular key rather than using an integer index.
Since the dictionary class is abstract, the class only provides the framework for a key mapped data. Rather than some specific implementation.
first of all lets break it down to pieces : Data and Structure.
What is a data? Googling on the internet said :
Philosophy “things that is probably known or assumed as facts, making the basis of reasoning or calculation”. Computing “the quantities, characters, or symbols on which operations are performed by a computer, being stored and transmitted in the form of another electrical signals and recorded on magnetic, optical, or mechanical recording media“
So, folks.. first of all what goes through your mind when you hear “modify”, well for me when I hear that word the simplest meaning is to “change”. So what is a modifier, basically modifiers (In java) are a keywords that you can add to those definitions to change their meanings. In the java language there are a wide range of variety for java modifiers types, including the following modifiers :
What is the multi threading programming that we used is Java, hear this.. Java is actually a multi-threaded programming language and by that Java can let us develop a multi-threaded program.
Do you know what a multi-threaded program is? well a multi-threaded program contains two or more than two parts. Which runs concurrently and each of that one part can handle different task (i.e codes that contains methods, constructors etc) at the same equal time. This can actually improves the optimal use of the available resource, if you have multiple CPUs.
Basically multi threading programming takes the idea of multi tasking. Which is “doing more than 1 activities at the same time”. Multi tasking in our terms it means when a multiple processes share a common process resource such as a CPU. Continue reading Multi Threading Programming (Java)
If there is an entity reference in a class, then you what you have is a code aggregation. Aggregation usually represents HAS-A relationship.
Consider the following situation situation.
A Worker object contains many informations such as id, name, phone number etc. It contains one more object named address, which contains its own informations such as city, state, country etc. see it as given below.
Okay lads, today we’re talking about Spinner. But hey! it’s not a fidget spinner that we’re talking. Because It is a Java JSpinner and JSpinner allows the users to select a number or an object value from an already sequence using single line input.
The Syntax :
public class JSpinner extends JComponent implements Accessible
First of all here are common constructor of Java JSpinner:
JSpinner() : This class is used to construct a spinner with an Integer SpinnerNumberModel and in addition of an initial value of 0 and with no minimum or maximum limits.
JSpinner(SpinnerModel model) : This is another one of Java JSpinner that is used to construct a spinner for a given model.
Especially relevant here are common methods ofmJava JSpinner :
void addChangeListener(ChangeListener listener) : This method is used to add another listener to the list which will be notified each time a change to the model occurs.
Object getValue() :While this method is used to return the current value of the model.
Due to Java 8 new features, that provides us java coders a method named forEach() to iterate the elements. forEach() method is defined in iterable and Stream interface. The collection classes which is the one that extends the iterable interface can use forEach loop to iterate elements. As a result you can pass lambda expressions as an argument in this method because it takes a single parameter which is a functional interface.