Java Learning--reflection properties operations

1     //gets the properties of the corresponding run-time class2 @Test3      Public voidtest1 () {4Class clazz = person.class;5         //1.getFields (): Can only get properties declared as public in the runtime class and its parent class6field[] Fields =clazz.getfields ();7         8          for(inti =0; I < fields.length;i++){9System. out. println (Fields[i]);Ten         } OneSystem. out. println (); A         //2.getDeclaredFields (): Gets all the properties declared by the runtime class itself -field[] Fields1 =clazz.getdeclaredfields (); -          for(Field f:fields1) { theSystem. out. println (F.getname ()); -         } -}

1 //permission modifier variable type variable name2     //gets the contents of the various parts of the property3 @Test4      Public voidtest2 () {5Class clazz = person.class;6field[] Fields1 =clazz.getdeclaredfields ();7          for(Field f:fields1) {8             //1. Get permission modifiers for each property9             inti =f.getmodifiers ();TenString str1 =modifier.tostring (i); OneSystem. out. Print (str1 +" "); A             //2. Get the type of the property -Class type =F.gettype (); -System. out. Print (Type.getname () +" "); the             //3. Get the property name -System. out. Print (F.getname ()); -              -System. out. println (); +         } -}

1 //calling properties specified in the run-time class2 @Test3      Public voidTest3 () throws exception{4Class clazz = person.class;5         //1. Get the specified property6         //GetField (String fieldName): Gets the property named FieldName of the specified property declared as public in the run-time class7Field name = Clazz.getfield ("name");8         //2. Creating objects for the runtime class9Person p =(person) clazz.newinstance ();TenSystem. out. println (p); One         //3. Assign a value to the specified property of the run-time class AName.Set(P,"Jerry"); -System. out. println (p); -System. out. println ("%"+name.Get(P)); the          -System. out. println (); -         //Getdeclaredfield (String fieldName): Gets the property named FieldName specified in the run-time class -Field age = Clazz.getdeclaredfield (" Age"); +         //because of the restriction of the property permission modifier, in order to ensure that the property can be assigned a value, it is necessary to make this property operational before the operation.  -Age.setaccessible (true); +Age.Set(P,Ten); ASystem. out. println (p); at          - //Field id = clazz.getfield ("id"); -          -}

1  classPerson extends creature<string>implements comparable,myinterface{2      PublicString name;3     Private intAge ;4     intID;5     //When you create a class, try to keep an empty parameter constructor. 6      PublicPerson () {7 super ();8 //System.out.println ("The weather is very sultry today");9     }Ten      PublicPerson (String name) { One super (); A          This. Name =name; -     } -     PrivatePerson (String name,intAge ) { the super (); -          This. Name =name; -          This. Age =Age ; -     } +      PublicString GetName () { -         returnname; +     } A      Public voidsetName (String name) { at          This. Name =name; -     } -      Public intGetage () { -         returnAge ; -     } -      Public voidSetage (intAge ) { in          This. Age =Age ; -     } to      +      Public intgetId () { -         returnID; the     } *      Public voidSetId (intID) { $          This. ID =ID;Panax Notoginseng     } -@MyAnnotation (value ="abc123") the      Public voidShow () { +System. out. println ("I am a person! "); A     } the      +     PrivateInteger Display (String Nation,integer i) throws exception{ -System. out. println ("My nationality is:"+nation); $         returni; $     } - @Override -      PublicString toString () { the         return "Person [Name="+ name +", age="+ Age +"]"; -     }Wuyi @Override the      Public intcompareTo (Object o) { -         //TODO auto-generated Method Stub Wu         return 0; -     } About      $      Public Static voidinfo () { -System. out. println ("The Chinese! "); -     } -      A     classbird{ +          the     } -      $}

ImportStaticJava.lang.annotation.elementtype.constructor;importStaticJava.lang.annotation.elementtype.field;importStaticJava.lang.annotation.elementtype.local_variable;importStaticJava.lang.annotation.elementtype.method;importStaticJava.lang.annotation.elementtype.parameter;importStaticJava.lang.annotation.elementtype.type;import Java.lang.annotation.retention;import Java.lang.annotation.retentionpolicy;import Java.lang.annotation.Target; @Target ({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, local_variable}) @Retention (retentionpolicy.runtime) Public@interface myannotation {String value ();}

 Public class Creature<t>{    publicdouble  weight;          Public void Breath () {        System. out. println (" breathe! ");    }}

import java.io.Serializable;  Public Interface MyInterface extends serializable{}

Java Learning--reflection properties operations