When performing implicit casting in Java, what is true?

• A. The source type has a larger range than the target type
• B. The source type has a smaller range than the target type
• C. It requires explicit syntax from the programmer
• D. It can only be performed on objects

Answer: (B)

Implicit casting, also known as widening conversion, occurs in Java when a variable of a smaller data type is automatically converted to a larger data type without the need for explicit syntax. This is a fundamental feature of the Java programming language that helps prevent data loss and maintains the integrity of the values being used.

In the context of data types, if the source type (the type being converted from) has a smaller range than the target type (the type being converted to), implicit casting is not only permissible but also safe. For instance, converting an int (which has a smaller range) to a long (which can represent much larger values) is an example of this widening conversion. Since all possible values of the int type can be represented in a long, this conversion does not lose any information, which is why it is done implicitly by the Java compiler.

Conversely, when a source type has a larger range than the target type, as in the case of casting a double to an int, the operation cannot be performed implicitly because it could lead to data loss (the possibility of losing the decimal part when converting a floating-point number to an integer). This is why explicit casting is required in such situations.