java 13 interview questions and answers

Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place. In numerical promotion, byte, char, and short values are converted to int values. The int values are also converted to long values, if necessary. The long and float values are converted to double values, as required. In Core Java, numeric promotion refers to the automatic … Read more

The exception propagates up to the next higher level try-catch statement (if any) or results in the program’s termination. In Java, a try-catch-finally statement must have either a catch clause or a finally clause (or both). If a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the … Read more

The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program’s appearance to the particular locale in which it is being run. The ResourceBundle class in Java is a part of the java.util package and is used for internationalization (i18n) and localization (l10n) of Java applications. It provides … Read more

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