complete tutorials on core java in java

An abstract class may not be declared as final. No, an abstract class cannot be declared as final in Java. The final keyword in Java is used to indicate that a class cannot be subclassed, and an abstract class is meant to be subclassed. By making a class final, you prevent any further extension or inheritance. On the … Read more

A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O, by unsuccessfully attempting to acquire an object’s lock, or by invoking an object’s wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method. In Core Java, a thread can enter the waiting state in three main ways: By invoking Object.wait() … Read more

Integer / and % can result in the throwing of an ArithmeticException. In Core Java, the arithmetic operations that can result in the throwing of an ArithmeticException include: Division by zero: If you attempt to divide a number by zero, it will result in an ArithmeticException. For example: java int result = 5 / 0; // This will throw an … Read more

A layout manager is an object that is used to organize components in a container. In Core Java, a layout manager is an object that is used to organize and control the placement of graphical components (such as buttons, text fields, and labels) within a container (such as a JFrame or JPanel). The layout manager … Read more

An uncaught exception results in the uncaughtException() method of the thread’s ThreadGroup being invoked, which eventually results in the termination of the program in which it is thrown. In Java, if an exception is not caught (handled) by an appropriate exception handler, it will propagate up the call stack. This process is known as “propagation of exceptions.” Here’s what … Read more