Javaのinstanceof判定

[Test Code]

view plainprint?

1. class a {  
2.     a() {  
3.     }  
4.     String getname() {  
5.         return "this is a.";  
6.     }  
7. }  
8. class b extends a {  
9.     b() {  
10.         super();  
11.     }  
12.     String getname() {  
13.         return super.getname()+"but this is also b";  
14.     }  
15. }  
16. Class<!-- extends a--> bclazz = b.class;  
17. a bx = new a();  
18. try {  
19.     bx = bclazz.newInstance();  
20. } catch (IllegalAccessException e) {  
21.     e.printStackTrace();  
22. } catch (InstantiationException e) {  
23.     e.printStackTrace();  
24. }  
25. if(bx instanceof b)  
26.     Log.w("Test", "this is instanceof b");  
27. if(bx instanceof a)  
28.     Log.w("Test", "this is instanceof a");  
29. Log.w("Test", bx.getname());  

		class a {
			a() {
			}
			String getname() {
				return "this is a.";
			}
		}
		class b extends a {
			b() {
				super();
			}
			String getname() {
				return super.getname()+"but this is also b";
			}
		}
		Class bclazz = b.class;
		a bx = new a();
		try {
			bx = bclazz.newInstance();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			e.printStackTrace();
		}
		if(bx instanceof b)
			Log.w("Test", "this is instanceof b");
		if(bx instanceof a)
			Log.w("Test", "this is instanceof a");
		Log.w("Test", bx.getname());

[Result]


08-29 09:41:31.314: WARN/Test(14370): this is instanceof b
08-29 09:41:31.314: WARN/Test(14370): this is instanceof a
08-29 09:41:31.314: WARN/Test(14370): this is a.but this is also b