115 lines
3.1 KiB
Java
115 lines
3.1 KiB
Java
/**
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@version 1.1 2004-02-21
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@author Cay Horstmann
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*/
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import java.util.*;
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import java.lang.reflect.*;
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public class ReflectionTest
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{
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public static void main(String[] args)
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{
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// read class name from command line args or user input
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String name;
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if (args.length > 0)
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name = args[0];
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else
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{
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Scanner in = new Scanner(System.in);
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System.out.println("Enter class name (e.g. java.util.Date): ");
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name = in.next();
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}
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try
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{
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// print class name and superclass name (if != Object)
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Class cl = Class.forName(name);
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Class supercl = cl.getSuperclass();
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System.out.print("class " + name);
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if (supercl != null && supercl != Object.class)
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System.out.print(" extends " + supercl.getName());
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System.out.print("\n{\n");
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printConstructors(cl);
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System.out.println();
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printMethods(cl);
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System.out.println();
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printFields(cl);
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System.out.println("}");
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}
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catch(ClassNotFoundException e) { e.printStackTrace(); }
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System.exit(0);
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}
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/**
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Prints all constructors of a class
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@param cl a class
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*/
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public static void printConstructors(Class cl)
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{
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Constructor[] constructors = cl.getDeclaredConstructors();
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for (Constructor c : constructors)
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{
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String name = c.getName();
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System.out.print(" " + Modifier.toString(c.getModifiers()));
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System.out.print(" " + name + "(");
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// print parameter types
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Class[] paramTypes = c.getParameterTypes();
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for (int j = 0; j < paramTypes.length; j++)
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{
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if (j > 0) System.out.print(", ");
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System.out.print(paramTypes[j].getName());
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}
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System.out.println(");");
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}
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}
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/**
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Prints all methods of a class
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@param cl a class
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*/
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public static void printMethods(Class cl)
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{
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Method[] methods = cl.getDeclaredMethods();
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for (Method m : methods)
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{
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Class retType = m.getReturnType();
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String name = m.getName();
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// print modifiers, return type and method name
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System.out.print(" " + Modifier.toString(m.getModifiers()));
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System.out.print(" " + retType.getName() + " " + name + "(");
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// print parameter types
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Class[] paramTypes = m.getParameterTypes();
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for (int j = 0; j < paramTypes.length; j++)
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{
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if (j > 0) System.out.print(", ");
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System.out.print(paramTypes[j].getName());
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}
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System.out.println(");");
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}
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}
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/**
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Prints all fields of a class
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@param cl a class
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*/
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public static void printFields(Class cl)
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{
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Field[] fields = cl.getDeclaredFields();
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for (Field f : fields)
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{
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Class type = f.getType();
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String name = f.getName();
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System.out.print(" " + Modifier.toString(f.getModifiers()));
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System.out.println(" " + type.getName() + " " + name + ";");
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}
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}
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}
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