一段学习反射的代码

package testreflect;
import javax.swing.*;

import java.lang.reflect.Field;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.lang.reflect.Method;

public class Test {
public Test() {
}

public static void printConstructors(Class c1){
Constructor[] constructors=c1.getDeclaredConstructors();
for(int i=0;i<constructors.length;i++){
Constructor c=constructors[i];
String name=c.getName();
System.out.print(Modifier.toString(c.getModifiers()));
System.out.print(" "+name+"(");

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(");");
}
}

public static void printMethods(Class c1){
Method[] methods=c1.getDeclaredMethods();
for(int i=0;i<methods.length;i++){
Method m=methods[i];
Class retType=m.getReturnType();
String name=m.getName();
System.out.print(Modifier.toString(m.getModifiers()));
System.out.print(" "+retType.getName()+" "+name+"(");

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(");");
}
}

public static void printFields(Class c1){
Field[] fields=c1.getDeclaredFields();

for(int i=0;i<fields.length;i++){
Field f=fields[i];
Class type=f.getType();
String name=f.getName();
System.out.print(Modifier.toString(f.getModifiers()));
System.out.println(" "+type.getName()+" "+name+";");
}
}

public static void main(String[] args) {
String name;
if(args.length>0){
name=args[0];

}else{
name=JOptionPane.showInputDialog("Class name (e.g. java.util.Date):");
}
try{
Class c1=Class.forName(name);
Class superc1=c1.getSuperclass();
System.out.println("class "+name);
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);
}

}