Requirement list

src/org/ReflectionTest.java

@@ -0,0 +1,119 @@
+import java.util.*;   
+import java.lang.reflect.*;   
+
+/**  
+* This program uses reflection to print all features of a class.  
+* Not the author 
+* Minor mod  
+*/   
+public class ReflectionTest   {   
+	public static void main(String[] args) {   
+    // read class name from command line args and if args is empty prompt user input   
+    String name;   
+    if (args.length > 0)
+		name = args[0];   
+    else  {   
+		Scanner in = new Scanner(System.in);   
+        System.out.println("Enter class name (e.g. java.util.Date): ");   
+        name = in.next();   
+    }   
+
+    try  {   
+		// print class name and superclass name (if != Object)   
+		Class cl = Class.forName(name);   
+		Class supercl = cl.getSuperclass();   
+		String modifiers = Modifier.toString(cl.getModifiers());   
+		if (modifiers.length() > 0) {
+			System.out.print(modifiers + " "); 
+		}  
+        System.out.print("class " + name);   
+        if (supercl != null && supercl != Object.class) 
+			System.out.print(" extends " + supercl.getName());   
+		System.out.print("\n{\n");
+
+		printConstructors(cl);   
+        System.out.println();   
+        printMethods(cl);   
+        System.out.println();   
+        printFields(cl);   
+        System.out.println("}");   
+	}   
+    catch (ClassNotFoundException e)  {   
+		e.printStackTrace();   
+    } 
+    catch (Exception e) {
+		e.printStackTrace();  
+	}  
+     System.exit(0);   
+}//end of main   
+
+	/**  
+	 * * Prints all constructors of a class  
+     * @param cl a class  
+    */   
+	public static void printConstructors(Class cl)   {   
+		Constructor[] constructors = cl.getDeclaredConstructors();   
+		for (Constructor c : constructors)   {   
+			String name = c.getName();   
+            System.out.print("   ");   
+            String modifiers = Modifier.toString(c.getModifiers());   
+            if (modifiers.length() > 0) {
+				System.out.print(modifiers + " "); 
+			}           
+            System.out.print(name + "(");   
+
+           // print parameter types   
+           Class[] paramTypes = c.getParameterTypes();   
+           for (int j = 0; j < paramTypes.length; j++)   {   
+			   if (j > 0) System.out.print(", ");   
+               System.out.print(paramTypes[j].getName());   
+             }   
+             System.out.println(");");   
+          }   
+	}   
+
+/**  
+ * * Prints all methods of a class  
+* @param cl a class  
+*/   
+	public static void printMethods(Class cl)   {   
+		Method[] methods = cl.getDeclaredMethods();   
+		for (Method m : methods)   {   
+			Class retType = m.getReturnType();   
+            String name = m.getName();   
+
+            System.out.print("   ");   
+            // print modifiers, return type and method name   
+            String modifiers = Modifier.toString(m.getModifiers());   
+            if (modifiers.length() > 0) System.out.print(modifiers + " ");            
+            System.out.print(retType.getName() + " " + name + "(");   
+
+            // print parameter types   
+            Class[] paramTypes = m.getParameterTypes();   
+            for (int j = 0; j < paramTypes.length; j++)   {   
+				if (j > 0) System.out.print(", ");   
+                System.out.print(paramTypes[j].getName());   
+             }   
+             System.out.println(");");   
+          }   
+       }   
+
+/**  
+* Prints all fields of a class  
+* @param cl a class  
+*/   
+	public static void printFields(Class cl)   {   
+		Field[] fields = cl.getDeclaredFields();   
+
+        for (Field f : fields)   {   
+			Class type = f.getType();   
+            String name = f.getName();   
+            System.out.print("   ");   
+            String modifiers = Modifier.toString(f.getModifiers());   
+            if (modifiers.length() > 0) {
+				System.out.print(modifiers + " "); 
+			}           
+            System.out.println(type.getName() + " " + name + ";");   
+          }   
+       }   
+    }