notes on core java in java

The paint() method supports painting via a Graphics object. The repaint() method is used to causepaint() to be invoked by the AWT painting thread. In Java, specifically in graphical user interface (GUI) programming using AWT or Swing, the paint() and repaint() methods serve different purposes. paint() method: The paint() method is part of the Component class (or its subclasses … Read more

A static variable is associated with the class as a whole rather than with specific instances of a class. Non-static variables take on unique values with each object instance. In Java, the terms “static” and “non-static” are used to describe different types of variables and methods. Here’s the difference between static and non-static variables: Static … Read more

A local inner class may be final or abstract. In Java, a local inner class is a class defined within a block of code, typically within a method. Local inner classes can have the following modifiers: Final: A local inner class can be marked as final, which means it cannot be extended by other classes. Abstract: A local … Read more

The Collection interface provides support for the implementation of a mathematical bag – an unordered collection of objects that may contain duplicates. In Java, the Collection interface is a part of the Java Collections Framework and is present in the java.util package. It is at the top of the hierarchy of collection interfaces. The Collection interface represents … Read more

Java uses layout managers to lay out components in a consistent manner across all windowing platforms. Since Java’s layout managers aren’t tied to absolute sizing and positioning, they are able to accomodate platform-specific differences among windowing systems. In Java, layout managers provide several advantages over traditional windowing systems when it comes to designing graphical user … Read more