Explain Typecasting in Java?

In Java, typecasting refers to the process of converting a value from one data type to another. It allows developers to treat an object or variable as if it belongs to a different type, enabling compatibility and flexibility in the program.

There are two types of typecasting in Java:

1. Implicit Typecasting (Widening):
Implicit typecasting occurs when the conversion is done automatically by the Java compiler. It happens when we assign a value of a smaller data type to a variable of a larger data type. For example, assigning an integer value to a floating-point variable. Since the target type has a larger range, no data loss occurs, and the conversion happens seamlessly.

Example:

   int num = 10;
   double decimal = num; // Implicit typecasting from int to double

2. Explicit Typecasting (Narrowing):
Explicit typecasting occurs when the conversion is performed explicitly by the programmer. It is necessary when we want to convert a value from a larger data type to a smaller data type. Explicit typecasting may result in data loss or truncation if the value exceeds the range of the target type.

Example:

   double decimal = 10.5;
   int num = (int) decimal; // Explicit typecasting from double to int

It's important to note that explicit typecasting should be used with caution, as it may lead to loss of precision or unexpected behavior if not done carefully. The programmer is responsible for ensuring the compatibility of the data types and handling any potential issues that may arise during the conversion.

Typecasting is commonly used in situations where data needs to be converted to perform specific operations or to meet the requirements of a particular method or API. It allows developers to work with different data types and manipulate values effectively in Java programs. By obtaining Java Certification, you can advance your career in Java. With this course, you can demonstrate your expertise in Core Java & J2EE basic and advanced concepts and popular frameworks like Hibernate, Spring & SOA, many more fundamental concepts, and many more critical concepts among others.