By setting a clipping shape in the graphics(graphics means to the creation, storage and manipulation of pictures and drawings using a digital computer) context, you constrain all drawing operations to the interior of that clipping shape. The clip method intersects the existing clipping shape with the new one .
Transformations are very useful in practice. They allow you to work with coordinate(x,y) values. The scale method of the Graphics2D class sets the coordinates transformation of the graphics context to a scaling transformation. There are four fundamental transformations 1)Scaling 2)Rotation 3)Translation 4)Shear
In the Java programming language, every thread has a thread priority. You can increase or decrease the priority of any thread with the setPriority(). You can set the priority to any value between MIN_PRIORITY(defined as 1 in the Thread class) and MAX_PRIORITY(defined as 10),NORM_PRIORITY(defined as 5).
Mouse events are generated when the user clicks a mouse button or moves the mouse.Java provides two mouse events and two mouse events masks, so that programs can deal separately with ordinary mouse events(pressed, released, entered, and exited) and mouse-motion events(moved and dragged).
Threads can be used for implementing animation in Java.Threads are ideals for anything that takes up a lot of time and run continuously. The Applet needs to implements the Runnable interface.
After the applet, the type of window, which is most often created, is derived from Frame. It is used to create child windows within applets, and top-level or child windows for application.
Start() method is used to start the execution and stop() method is used to stop the execution of the process. A process is a program that is executing.By using start and stop Button on a Frame the elapsed time display in the Label.
Borders are basically a margin around the edges of a Swing component. Borders are useful for providing titles and empty space around components.The setBorder() is used to put a border around a component.
Arrays are a way to store a list of items that have the same primitive data type or class. Each item on the list goes into its own slot, which is numbered, so that the information can be easily accessed. Array can store any type of information that can be stored in a variable.
A String is an object that is created using String class. The String class is more commonly used for display message, search or compare the strings,extract individual characters in a string s substring. The length is used for determining the length(number of characters in the String) of a String.