[Java] Reflection 筆記

1. @SuppressWarnings("unused") 
2. Object obj = new Object() { 
3.    String id = "123"; 
4.    public String name = "Jax"; 
5. }; 
6.  
7. Class<?> cl = obj.getClass(); 
8.  
9. for (Field field : cl.getFields()) { 
10.    System.out.printf("%s = %s {%s}\n", 
11.        field.getName(), field.get(obj), field.getType()); 
12. } 
13.  
14. System.out.println("======================="); 
15.  
16. for (Field field : cl.getDeclaredFields()) { 
17.    System.out.printf("%s = %s {%s}\n", 
18.        field.getName(), field.get(obj), field.getType()); 
19. } 

@SuppressWarnings("unused")
Object obj = new Object() {
    String id = "123";
    public String name = "Jax";
};

Class<?> cl = obj.getClass();

for (Field field : cl.getFields()) {
    System.out.printf("%s = %s {%s}\n",
        field.getName(), field.get(obj), field.getType());
}

System.out.println("=======================");

for (Field field : cl.getDeclaredFields()) {
    System.out.printf("%s = %s {%s}\n",
        field.getName(), field.get(obj), field.getType());
}

Output:

1. name = Jax {class java.lang.String} 
2. ======================= 
3. id = 123 {class java.lang.String} 
4. name = Jax {class java.lang.String} 

name = Jax {class java.lang.String}
=======================
id = 123 {class java.lang.String}
name = Jax {class java.lang.String}