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125 lines (110 loc) · 3.16 KB
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package com.ch05.reflection;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Scanner;
public class ReflectionTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
// read class name from command line args or 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 c1 = Class.forName(name);
Class superC1 = c1.getSuperclass();
String modifiers = Modifier.toString(c1.getModifiers());
if(modifiers.length() > 0) {
System.out.print(modifiers + " ");
System.out.print("class " + name);
if(superC1 != null && superC1 != Object.class) {
System.out.println(" extends " + superC1.getName());
}
System.out.print("\n{\n");
printConstructors(c1);
System.out.println();
printMethods(c1);
System.out.println();
printFields(c1);
System.out.println("}");
}
} catch (ClassNotFoundException e) {
// TODO: handle exception
e.printStackTrace();
}
System.exit(0);
}
/**
* Prints all constructors of a class
*/
public static void printConstructors(Class c1) {
Constructor[] constructors = c1.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
*/
public static void printMethods(Class c1) {
Method[] methods = c1.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 parameters types
Class[] paramTypes = m.getParameterTypes();
for(int j = 0; j < paramTypes.length; j++) {
if(j > 0) {
System.out.print(", ");
}
System.out.println(paramTypes[j].getName());
}
System.out.println(");");
}
}
/**
* Prints all fields of a class
*/
public static void printFields(Class c1) {
Field[] fields = c1.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.println(modifiers + " ");
}
System.out.println(type.getName() + " " + name + ";");
}
}
}