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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		myFinalClass a=new myFinalClass();
  14.  
  15. 		//======= 底下證明就算被宣告成 final 的 class 還是可以 "修改"
  16. 		a.val=100;
  17. 		System.out.println(a.val);
  18. 		a.val=200;
  19. 		System.out.println(a.val);
  20.  
  21. 		a=new myFinalClass();
  22. 		System.out.println(a.val);
  23. 		a.val=1000;
  24. 		System.out.println(a.val);
  25.  
  26. 	}
  27. }
  28.  
  29. final class myFinalClass{
  30. 	public int val=-1;
  31. }
  32.  
  33. class myClass{
  34. 	public int val=-2;
  35. }
  36.  
  37. //因為 myClass 不是 Final ，所以可以被繼承
  38. class HiClass extends myClass{
  39. 	public float MIT=0;
  40. }
  41.  
  42. //但是因為 myFinalClass 宣告為 final 無法被繼承
  43. //把底下註解拿掉，會無法編譯通過
  44. /*
  45. class HelloClass extends myFinalClass{
  46. 	public float XDD=0;
  47. }
  48. */
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
100
200
-1
1000
https://ideone.com/VbYiMc
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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