Usage Notes
1. The implementation class is not a generic class, and the interface must have a clear data type.
2. The implementation class is also a generic class, so the generic types must be consistent.
3. Generic type parameters can only be class types, not simple types. The instanceof operation cannot be used on exact generic types.
Example
interface Info<T>{
public T getValue();
}
class InfoImpl implements Info {
public String getVar() {
return null;
}
}The basic data types of Java are divided into:
1. Integer type , a data type used to represent integers.
2. Floating point type, a data type used to represent decimals.
3. Character type. The keyword of character type is "char".
4. Boolean type is the basic data type that represents logical values.
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