Wrapper Class in Java
The Wrapper class represents the base class for a set of data sources. This class provides library initialization services and access to the data source servers that the wrapper supports. The Wrapper class maintains the following information:
* The wrapper name.
* The wrapper core library name. The returned name is the name of the native library that loaded the wrapper.
* A WrapperInfo object that contains all of the information that pertains to this wrapper. This information gets stored in the federated server's system catalog as a result of issuing the DDL statements CREATE WRAPPER or ALTER WRAPPER.
* The FencedWrapper class and the UnfencedWrapper class are subclasses of the Wrapper class.
The Wrapper class is a wrapper class for the Java API.
Wrapper classes corresponding to respective simple data types are as given in table below.
Primitive Data Types
Wrapper class
byte - Byte
short - Short
int - Integer
long - Long
char - Character
float - Float
double - Double
boolean - Boolean
void - Void
This sample code shows the use of Character wrapper class:
public class IsDemo {
public static void main(String[] args) {
char a[] = {'a','b','5','?','A',' '};
for(int i=0;i<a.length;i++){
if(Character.isDigit(a[i]))
System.out.println(a[i] + "is a digit ");
if(Character.isLetter(a[i]))
System.out.println(a[i] + "is a letter ");
if(Character.isWhitespace(a[i]))
System.out.println(a[i] + "is a White Space ");
if(Character.isLowerCase(a[i]))
System.out.println(a[i] + "is a lower case ");
if(Character.isLowerCase(a[i]))
System.out.println(a[i] + "is a upper case ");
}
}
}
