反射分析代码实例 打印一个类的全部信息

话不多说，直接看代码

public static void main(String[] args) {
// TODO Auto-generated method stub

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{
Class c1=Class.forName(name);
Class supercl = c1.getSuperclass();
String modifiers = Modifier.toString(c1.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(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[] constructor =c1.getDeclaredConstructors();
for(Constructor c :constructor){
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+”(");

Class[] paramTypers =c.getParameterTypes();
for(int j=0;j<paramTypers.length;j++){
if(j>0) System.out.print(", “);
System.out.print(paramTypers[j].getName());
}
System.out.println(”);");
}
}

public static void printMethods(Class c1){
Method[] methods=c1.getDeclaredMethods();

for(Method m:methods){
Class reType =m.getReturnType();
String name =m.getName();
System.out.print(" “);
String modifies= Modifier.toString(m.getModifiers());
if(modifies.length()>0) System.out.print(modifies + " “);
System.out.print(reType.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(Field f:fields){
Class type=f.getType();
String name=f.getName();
System.out.println(" “);
String modifiers =Modifier.toString(f.getModifiers());
if(modifiers.length() >0) System.out.print(modifiers+” “);
System.out.println(type.getName()+” “+name+”：");
}
}