mutable parameters in Java

Java allows methods to use variable parameters after 1.5, the advantage of a mutable parameter is that it allows 0 or more parameters to be passed. For example, there is a code to download the following:

Java code 650) this.width=650; "class=" star "src=" Http://yizhenn.iteye.com/images/icon_star.png "alt=" Favorite Code "style=" border:0px; "/>

2. Public class Test {

4. Public Static void Main (string[] args) {

6. Test ();

8. Test (new string[]{"a"});

10. Test (new string[]{"A", "B"});

12. }

16. Private Static void Test () {

18. System.out.println ("[]");

20. }

24. Private Static void Test (string[] args) {

26. System.out.println (arrays.tostring (args));

28. }

30. }

The code after using the mutable parameter is downloaded as follows:

Java code 650) this.width=650; "class=" star "src=" Http://yizhenn.iteye.com/images/icon_star.png "alt=" Favorite Code "style=" border:0px; "/>

2. Public class Test {

4. Public Static void Main (string[] args) {

6. Test ();

8. Test (new string[]{"a"});

10. Test (new string[]{"A", "B"});

12. }

16. Private Static void Test (String ... args) {

18. System.out.println (arrays.tostring (args));

20. }

22. }

> We know that in Java everything is a class except for 8 basic types. So what kind of variable parameter is it? Come, use the code download Verify!  

Java code 650) this.width=650; "class=" star "src=" Http://yizhenn.iteye.com/images/icon_star.png "alt=" Favorite Code "style=" border:0px; "/>

2. Public class Test {

4. Public Static void Main (string[] args) {

6. Whatclass ();

8. WhatClass1 ();

10. }

14. Private Static void whatclass (String ... args) {

16. System.out.println (Args.getclass ());

18. System.out.println (new string[]{}.getclass ());

20. }

24. Private Static void whatClass1 (int... args) {

26. System.out.println (Args.getclass ());

28. System.out.println (new int[]{}.getclass ());

30. }

32. }

The result of the above code is:
class [Ljava.lang.String;
class [Ljava.lang.String;
class [I
class [I

mutable parameters in Java