How can data types be converted in Java?

In Java, data type conversion is typically classified into two types: automatic type conversion and forced type conversion.

1. Automatic type conversion (implicit type conversion) refers to the process in Java where the compiler automatically converts one data type to another when needed. For example, when assigning an int value to a double variable, the compiler will automatically convert the int type to double type.

Code example:

int a = 10;
double b = a; // 自动将int类型转换为double类型

1. Explicit type conversion, also known as type casting, refers to converting one data type to another using a specific casting operator. It is important to be cautious when performing explicit type conversions as it may result in loss of precision or data overflow.

Example code:

double c = 10.5;
int d = (int) c; // 强制将double类型转换为int类型

It is important to consider whether the target data type can fully store the values of the original data type during data type conversion, in order to avoid data loss or overflow.