Java basic data type Addendum

It is easy to ignore.

1. All numeric types have positive and negative signs, so do not look for unsigned numeric types.

 

2. The size of the bucket occupied by the boolean type is not explicitly specified. It is defined as true or false.

 

3. The package class of the basic type allows you to create a non-basic object in the heap to indicate the corresponding basic type.

 

4. High-Precision numbers

Java provides two classes for high-precision computing: biginteger and bigdecimal. Although they generally fall into the "Wrapper class" category, neither of them has a corresponding basic type.

However, the methods contained in these two classes provide similar operations for basic types. That is to say, the int and float operations can also be applied to biginteger or bigdecimal operations. However, you must replace the operator with the method call method. This process is complicated, so the computing speed is slow. Here, we exchange speed for accuracy. Biginteger supports Integers of any precision. That is to say, in an operation, an integer of any size can be accurately expressed without any information loss. Bigdecimal supports the number of points with any precision. For example, it can be used for precise currency calculation.