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  1. import java.lang.reflect.Field;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) {
  5.     	HasPrivate hasPrivate = new HasPrivate();
  6.  
  7.         Nakami nakami = new Nakami();
  8.         System.out.println("Nakamiをセットします。");
  9.         setNakami(hasPrivate, nakami);
  10.         System.out.println("セットしたNakamiを取得します。");
  11.         getNakami(hasPrivate, nakami);
  12.         System.out.println("もともと入れてあるNakamiを取得します。");
  13.         getArimasu(hasPrivate);
  14.     }	
  15.  
  16.  
  17.     public static void setNakami(HasPrivate hasPrivate, Nakami nakami) {
  18.         try {
  19.             Field privateField = HasPrivate.class.getDeclaredField("nakami");
  20.             privateField.setAccessible(true);
  21.             privateField.set(hasPrivate, nakami);
  22.         } catch (NoSuchFieldException | SecurityException e) {
  23.             // TODO Auto-generated catch block
  24.             e.printStackTrace();
  25.         } catch (IllegalArgumentException e) {
  26.             // TODO Auto-generated catch block
  27.             e.printStackTrace();
  28.         } catch (IllegalAccessException e) {
  29.             // TODO Auto-generated catch block
  30.             e.printStackTrace();
  31.         } catch (NullPointerException e){
  32.             e.printStackTrace();
  33.         }
  34.     }
  35.  
  36.     public static void getNakami(HasPrivate hasPrivate, Nakami nakami) {
  37.         try {
  38.             Field privateField = HasPrivate.class.getDeclaredField("nakami");
  39.             privateField.setAccessible(true);
  40.             Nakami nakami2 = (Nakami) privateField.get(hasPrivate);
  41.             System.out.println("取得したnakami:" + nakami2);
  42.             System.out.println("HasPrivateからもらったnakami:"+hasPrivate.getNakami());
  43.             System.out.println("Nakamiのnakami:" + nakami2.nakami);
  44.         } catch (Exception e){
  45.             e.printStackTrace();
  46.         }
  47.     }
  48.  
  49.     public static void getArimasu(HasPrivate hasPrivate) {
  50.         try {
  51.             Field arimasu = HasPrivate.class.getDeclaredField("arimasu");
  52.             arimasu.setAccessible(true);
  53.             Nakami nakami = (Nakami) arimasu.get(hasPrivate);
  54.             System.out.println("取得したarimasu:" + nakami);
  55.             System.out.println("HasPrivateからもらったariamsu:"+hasPrivate.getArimasu());
  56.             System.out.println("arimasuのnakami:" + nakami.nakami);
  57.         } catch (Exception e){
  58.             e.printStackTrace();
  59.         }
  60.     }
  61. }
  62.  
  63. class HasPrivate {
  64.     private Nakami nakami;
  65.     private Nakami arimasu=new Nakami();
  66.  
  67.     public Nakami getNakami(){
  68.         return nakami;
  69.     }
  70.  
  71.     public Nakami getArimasu(){
  72.         return arimasu;
  73.     }
  74. }
  75.  
  76.  
  77.  
  78. class Nakami {
  79.     public String nakami="中身";
  80. }
Success #stdin #stdout 0.11s 320512KB
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Standard input is empty
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Nakamiをセットします。
セットしたNakamiを取得します。
取得したnakami:Nakami@10dea4e
HasPrivateからもらったnakami:Nakami@10dea4e
Nakamiのnakami:中身
もともと入れてあるNakamiを取得します。
取得したarimasu:Nakami@647e05
HasPrivateからもらったariamsu:Nakami@647e05
arimasuのnakami:中身
https://ideone.com/w3Xui9
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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