package 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)
{
String name;
if(args.length>0)
//args.length是传递参数的长度,而它是怎么传递的,在本类中传递的参数有哪些
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
{
Class c1=Class.forName(name);
Class superc1=c1.getSuperclass(); //这里的getSuperclass()指的是什么
String modifiers=Modifier.toString(c1.getModifiers());
if(modifiers.length()>0)
System.out.println("class"+name);
if(superc1!=null&&superc1!=Object.class)
System.out.println("extends"+superc1.getName());
System.out.println("\n{\n");
printConstructors(c1);
System.out.println();
printMethods(c1);
System.out.println();
printFields(c1);
System.out.println("}");
}
catch(ClassNotFoundException e)
{
e.printStackTrace();
}
System.exit(0);
}
public static void printConstructors(Class c1)
{
Constructor[] constructors=c1.getDeclaredConstructors();
for(Constructor c:constructors)
{
String name=c.getName();
System.out.println(" ");
String modifiers=Modifier.toString(c.getModifiers());
if(modifiers.length()>0)
System.out.println(modifiers+" ");
Class[] paramTypes=c.getParameterTypes();
for(int j=0;j<paramTypes.length;j++)
{
if(j>0)
System.out.println(paramTypes[j].getName());
}
System.out.println(");");
}
}
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(" ");
String modifiers=Modifier.toString(m.getModifiers());
if(modifiers.length()>0)
System.out.print(modifiers+" ");
System.out.print(retType.getName()+" "+name+"(");
Class[] paramTypes=m.getParameterTypes();
for(int j=0;j<paramTypes.length;j++)
{
if(j>0)
System.out.println(",");
System.out.println(paramTypes[j].getName());
}
System.out.println(");");
}
}
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(type.getName()+" "+name+";");
}
}
}
// 谁能给我详细分析下此程序,每一步的作用是什么,有是怎么实现他每一个步骤的。 |
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