Creation statement: Contains AI-assisted creation
In Java, type conversion is the process of converting one data type to another data type. Type conversion is divided into two types: implicit type conversion (automatic type conversion) and explicit type conversion (forced type conversion).
Implicit type conversion (automatic type conversion):
Implicit type conversion refers to the automatic conversion of a smaller range of data types to a larger range of data types without explicit type conversion. This is because data types of a smaller range can safely fit within a data type of a larger range.
Example:
int x = 10;
double y = x;
In this example, the variable x of type int is automatically converted to the variable y of type double. Since the range of the double type is greater than that of the int type, a value of type int can be assigned to a variable of type double without loss of precision.
Explicit type conversions (casts):
Explicit type conversion refers to the coercion of one data type to another data type, which needs to be converted using the cast operator (target data type). Explicit type conversions may result in data loss or overflow, so they need to be used with caution.
Example:
double x = 3.14;
int y = (int) x;
In this example, a variable x of type double is cast to a variable y of type int. Since the range of the int type is smaller than that of the double type, the decimal part will be truncated during the forced conversion, which may result in data loss.
It should be noted that type conversion can only be performed between mutually compatible data types. For example, an integer type can be converted to a floating point type, but a string type cannot be directly converted to an integer type. When performing type conversion, you should ensure that the converted data type is legal and safe to avoid data loss or overflow problems.