These are the common classes, corresponding to classes defined within the standard Java environment. It is up to you if you wish to change them.
These are found in all four subpackages of the
java
subpackage.
For a definition of these classes see the Java language and library definitions.
These are the classes within the java.lang
package.
Boolean
Byte
Char
Double
Float
Integer
Long
Object
Short
String
These are the classes within the java.math
package.
Big Decimal
Big Integer