tag:blogger.com,1999:blog-8712770457197348465.post583721331090459701..comments2024-03-19T01:04:48.783-07:00Comments on Javarevisited: Is Java Pass by Value or Pass by Reference? Examplejavin paulhttp://www.blogger.com/profile/15028902221295732276noreply@blogger.comBlogger16125tag:blogger.com,1999:blog-8712770457197348465.post-83067260390673707132017-08-05T15:01:57.702-07:002017-08-05T15:01:57.702-07:00This is one of the most false ideas about how java...This is one of the most false ideas about how java works. Pass-by-value always means that the method operates on DUPLICATED DATA, which is then returned by a return function. Pass-by-reference always works via a reference(pointer like) and operates on the original data - which is how java objects work. The fact that original variables can't be made to point to something else, is totally Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-2669105007199815612016-10-30T23:56:41.536-07:002016-10-30T23:56:41.536-07:00Java references are pointers and as with primitive...Java references are pointers and as with primitives are passed by value. End of story. The fact you can not perform pointer arithmetic is neither here nor there. Richardhttps://www.blogger.com/profile/04002001799007552493noreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-45982656113275360422016-05-29T01:24:40.280-07:002016-05-29T01:24:40.280-07:00@Anonymous, it's basically something (a data s...@Anonymous, it's basically something (a data structure) which allow you to modify, view or access and object. Yes, it does contain the memory address of object. Please see JVM internals specification to learn more about how reference variable works in Java. javin paulhttps://www.blogger.com/profile/15028902221295732276noreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-24962135113486253032016-05-14T20:34:51.200-07:002016-05-14T20:34:51.200-07:00Ok when you say: reference stores only "handl...Ok when you say: reference stores only "handle".. what exactly is this "handle".. how do we view it.. its a "address" or its just another "variable"...? what do we see it in memory.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-82282294677922537142016-04-01T12:15:30.452-07:002016-04-01T12:15:30.452-07:00Why Pass by reference is not applicable for Wrappe...Why Pass by reference is not applicable for Wrapper classes even though we create object for these classes?Anonymoushttps://www.blogger.com/profile/03690171843878794293noreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-7553671599903216352014-09-30T01:26:33.294-07:002014-09-30T01:26:33.294-07:00The article is completely wrong. This is probably ...The article is completely wrong. This is probably the most persistent java myth!<br /><br />Objects are ALWAYS PASSED BY REFERENCE! It's completely irrelevant that you get a copy of the reference, you won't get a copy of the object! That's the key point! Using that "copy of the reference" you can modify the original object! That's actually why people use Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-30710955005254946102014-09-07T08:19:52.247-07:002014-09-07T08:19:52.247-07:00Hi,
The brand field in Car class is private, how ...Hi,<br /><br />The brand field in Car class is private, how can you do car.brand = "Maruti"; ? Does your program compile?<br /><br />In PassByReferenceConfusion example, you passed the reference to car object to method printBrand and this method changed the state of the car object, that's why the main method see this change which mean you passed the reference to the object itself! Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-8872901602788376072014-08-17T01:13:53.309-07:002014-08-17T01:13:53.309-07:00Thnks sir, ur blog is a treausre.
But one thing i ...Thnks sir, ur blog is a treausre.<br />But one thing i wanto point out that: there are actually three ways in c++: Pass by value,pass by pointer, pass by reference. In c there are only two: pass by value and pass by pointer.<br />This is explained in book: Programming inC++ by Anshuman Sharma.Anonymoushttps://www.blogger.com/profile/01407386375912836236noreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-91596276563091274322014-07-29T10:04:39.660-07:002014-07-29T10:04:39.660-07:00public class PassByValue1 {
public static void ma...public class PassByValue1 {<br /> public static void main(String[] args) {<br /> Integer len = 10;<br /> System.out.println("len = " + len);<br /> m1(len);<br /> System.out.println("len = " + len);<br /> }<br /> <br /> public static void m1(Integer Length) {<br /> Integer len = 15;<br /> Length = len;<br /> }<br />}GKhttps://www.blogger.com/profile/10017857679091199573noreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-79137570136427523772014-06-05T03:21:55.065-07:002014-06-05T03:21:55.065-07:00How it stands true in case of array as a method pa...How it stands true in case of array as a method parameters?<br /><br />ex:-<br /><br />int arr[]=new int [4];<br /><br />printArray(arr);<br /><br />public static void printArray( int [] temp)<br />{<br />sysout...<br />}<br /><br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-77032024760395052032013-06-11T05:44:46.556-07:002013-06-11T05:44:46.556-07:00Oops! I meant "pseudo-terms like pass-by-refe...Oops! I meant "pseudo-terms like pass-by-reference". It's ALL pass-by-value.<br /><br />And in response to Anonymous June 7 regarding JVMs and EJBs -- that's why objects need to be serialized in some environments. Across VMs, the object is serialized and re-created on the other machine. There's no call stack, and it's really a whole other topic.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-22810630505403503822013-06-11T04:29:38.341-07:002013-06-11T04:29:38.341-07:00I hate this "debate". It's simple. T...I hate this "debate". It's simple. The bit pattern of the value is copied into the parameter. It doesn't matter if it's a primitive or a reference type. There's no need to cloud the issue with pseudo-terms like pass-by-value. If the bit pattern is a primitive, or if the bit pattern is a reference to an object, its bits are simply copied. It's easy to understand, and Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-59817917782760669922013-06-07T07:34:39.163-07:002013-06-07T07:34:39.163-07:00If Java is Passing reference of the value, how do ...If Java is Passing reference of the value, how do things happen across JVMs. or say objects passed in EJBsAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-89648637107860735402013-01-16T02:09:54.272-08:002013-01-16T02:09:54.272-08:00Whether or not there is "value copy" dep...Whether or not there is "value copy" depends on the compiler. And yes, Java holds all "copies" of a reference as actual parameters when it is passed to methods.<br /><br />The real "pass-by-reference" then should replace formal parameters by what is passed in to let everything in the "passing chain" share the same reference.Anonymoushttps://www.blogger.com/profile/05012558793592552994noreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-82941123316345402212012-12-20T21:38:37.164-08:002012-12-20T21:38:37.164-08:00I knew that Java does not support pass by referenc...I knew that Java does not support pass by reference simply because lack of pointers in Java but object reference always seems confusing to me because it looks exactly similar to pass by reference. Thanks for clear wording which helps to isolate this single case in Java. By the this is also referred as call by value and call by reference :)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8712770457197348465.post-29471007978407404182012-12-18T10:45:04.262-08:002012-12-18T10:45:04.262-08:00A slightly modified version (picked up from stack ...A slightly modified version (picked up from stack over flow). Assigning a new object in called method may make it clear how it would not affect object in calling method.<br /><br />public static void main(String args[]) {<br /> Car car1 = new Car("BMW");<br /> System.out.println("Brand of Car Inside main() before: " + car1.brand);<br /> printBrand(car1);<br /> tarun khttps://www.blogger.com/profile/11392748105802885663noreply@blogger.com