Java Tutorial

by Dinesh Thakur Category: Java Methods

Accessor methods are used for initializing and accessing the value of instance variables. The value of these instance variables can be used further in the program. For creating accessor methods, it is required to create two methods among which one method is used to initialize the value and other is used to retrieve the value. An accessor method makes the program more readable and understandable. Moreover, accessor methods are similar to any other method, as can be seen from Program.

 
by Dinesh Thakur Category: Java Methods

A Java method is a collection of statements, all performing a particular operation.  Let’s say that you were calling the method called System.out.println(); Java executes some different statements that print a message to your console.  We’re going to look at the creation of methods or, as they often called, functions.

 
 
by Dinesh Thakur Category: Java Methods

Since the string variable str is static, it is initialized to "This is second line displayed" (static variables are initialized before an object is initiated). Then, the static block is executed which will invoke the disp() method displaying the message: "This is first line displayed". Static() method can be invoked without the need of any object. In main(), again disp() method is called with the string str (This is second line displayed). After that an object SMV is made, and it will get a member str2 initialized to "This is last line displayed". Then disp() is called with SMV.str2 which displays: This is last line displayed on the screen

 
by Dinesh Thakur Category: Java Methods

Tail recursion occurring when the recursive call is at the end of the recursive instruction. This eliminates the potential problem of stack overflow. A call is tail recursive if nothing has to be done after the call returns. i.e. when the call returns, the returned value is immediately returned from the calling method.

 
by Dinesh Thakur Category: Java Methods

In this program, user is asked a number to enter which is stored in integer form in variable n. The value entered is say 1023.Now, this value of variable n is passed to parameter x by invoking revers() method. In revers() method, x is divided by 10 and the remainder is displayed (% returns remainder). When 1023 is divided by 10, the remainder will be 3 which is displayed on the screen. Then, again revers() is invoked with value 102/10 i.e. with 102 (because the output of dividing two integers is also an integer). 102 is assigned to variable x. Again, 102 is divided by 10 and the remainder is displayed. The remainder this time will be 2 which is displayed. Again revers() method is invoked with 10/10 i.e. which 1. And the process continues until value of x becomes 0.

 
by Dinesh Thakur Category: Java Methods

Recursion occurs when a function calls itself in its own body. That is, in the body of the function definition there is a call to itself. When the function calls itself in its body, it results in an infinite loop. So, there has to be an exit condition in every recursive program.

 
by Dinesh Thakur Category: Java Methods

There are two ways of passing arguments to a method (function/subroutine):

1. Call by Value

This method copies the value of an argument into the formal parameter of the method. Therefore, changes made to the parameter of the method are limited to that method only and there is no impact of changes on the argument. That is, when control returns back to the caller method, earlier values of the arguments will be seen.

 
by Dinesh Thakur Category: Java 2D Example

The Java2D API provides advanced two-dimensional graphics capabilities for programmers who require detailed and complex graphical manipulations. The API includes features for processing line art, text and images in packages java.awt, java.awt.image, java.awt.color, java.awt.font. java.awt.geom, java.awt.print and java.awt.image.renderable.



 
by Dinesh Thakur Category: Java 2D Example

The variable map is which allows you to assign design attributes of the object type source AttributedString. Through this variable may change any aspect of the font . TextAttribute example shown the code as follows:

 
by Dinesh Thakur Category: Java 2D Example

This code can be seen as built a clipping path with the text area of the word " Dinesh Thakur " located in the middle of the window. In the drawn area can be seen as the image is painted behind the chain. As seen, the effect is very colorful and easy to perform.

 

 
by Dinesh Thakur Category: Java 2D Example

This code can be seen as built a clipping path with the content of the text area of the word "Java " located in the middle of the window.In the drawn area can be seen as the image is painted behind the chain. As seen, the effect is very colorful and easy to perform.

 
by Dinesh Thakur Category: Java 2D Example

With this code we will study how text is drawn on a any image.

 
by Dinesh Thakur Category: Java 2D Example

much more powerful mechanism for drawing text is provided  the TextLayout class.This class not only allows you to draw text in a similar way  to as was done be fore but also provides a number of methods that  let youk now what is specific to draw features.

 
by Dinesh Thakur Category: Java 2D Example

In this example we show how the Set operations going to make a Addition of 2 circles. An example show the code below:

 
by Dinesh Thakur Category: Java 2D Example

In this example we show how the Set operations going to make a Intersection of 2 circles . Intersection examples how the code as follows:

 
by Dinesh Thakur Category: Java 2D Example

In this example we show how the Set operations going to make a Subtraction of 2 circles . Subtraction examples how the code as follows:

 
by Dinesh Thakur Category: Java 2D Example

In this example we show how the Set operations going to make a union of 2 circles. Union exclusive (XOR ) examples how the code as follows:

 
by Dinesh Thakur Category: Java 2D Example

Another way is to build figures using GeneralPath class, which but also inherits from Shapeisan interface, but a class. This class allows  define a shape by a sequence oflines that can be established through  functions in the following table:

 


About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.