Class
Primary Function
AccessibleObject
Allows you to bypass the default access control checks.
Array
Allows you to dynamically create and manipulate arrays.
Constructor
Provides information about a constructor.
Field
Provides information about a field.
Method
Provides information about a method.
Modifier
Provides information about class and member access modifiers.
Proxy
Suppor ts dynamic proxy classes.
ReflectPermission
Allows reflection of private or protected members of a class.
TABLE 27-4
Classes Defined in java.lang.reflect
several methods that can be used to obtain information about an object. You will want to
explore these on your own. However, each supports the toString( ) method. Therefore,
using Constructor, Field, and Method objects as arguments to the println( ) method is
straightforward, as shown in the program.
// Demonstrate reflection.
import java.lang.reflect.*;
public class ReflectionDemo1 {
public static void main(String args[]) {
try {
Class c = Class.forName("java.awt.Dimension");
System.out.println("Constructors:");
Constructor constructors[] = c.getConstructors();
for(int i = 0; i < constructors.length; i++) {
System.out.println(" " + constructors[i]);
}
System.out.println("Fields:");
Field fields[] = c.getFields();
for(int i = 0; i < fields.length; i++) {
System.out.println(" " + fields[i]);
}
System.out.println("Methods:");
Method methods[] = c.getMethods();
for(int i = 0; i < methods.length; i++) {
System.out.println(" " + methods[i]);
}
}
catch(Exception e) {
System.out.println("Exception: " + e);
}
}
}
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