pass array to method Java

Question

How can I pass an entire array to a method   private void PassArray         String   arrayw   new String 4         populate array     PrintA arrayw        private void PrintA String   a          do whatever with array here     How do I do this correctly

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In this way we can pass an array to a function  here this print function will print the contents of the array   public class PassArrayToFunc        public static void print char    arr            for int i   0   i lt arr length i                  System out println arr i                         public static void main String   args            Scanner scan   new Scanner System in           char    array   scan next   toCharArray            print array           scan close

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An array variable is simply a pointer  so you just pass it like so   PrintA arrayw     Edit   A little more elaboration  If what you want to do is create a COPY of an array  you ll have to pass the array into the method and then manually create a copy there  not sure if Java has something like Array CopyOf     Otherwise  you ll be passing around a REFERENCE of the array  so if you change any values of the elements in it  it will be changed for other methods as well

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Simply remove the brackets from your original code   PrintA arryw    private void PassArray        String   arrayw   new String 4         populate array     PrintA arrayw     private void PrintA String   a         do whatever with array here     That is all

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You do this   private void PassArray         String   arrayw   new String 4     populate array     PrintA arrayw      private void PrintA String   a          do whatever with array here     Just pass it as any other variable  In Java  arrays are passed by reference

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You got a syntax wrong  Just pass in array s name  BTW - it s good idea to read some common formatting stuff too  for example in Java methods should start with lowercase letter  it s not an error it s convention

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Important Points   you have to use java util package array can be passed by reference   In the method calling statement   Don t use any object to pass an array only the array s name is used  don t use datatype or array brackets        Sample Program  import java util     class atg     void a         int b    1 2 3 4 5 6 7       c b          void c int b          int e b length      for int f 0 f lt e f            System out print b f         Single Space              public static void main String args          atg ob new atg        ob a              Output Sample Program  1 2 3 4 5 6 7

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class test       void passArr                 int arr1    1 2 3 4 5 6 7 8 9           printArr arr1              void printArr int   arr2                for int i 0 i lt arr2 length i                          System out println arr2 i                              public static void main String   args                test ob new test            ob passArr

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There is an important point of arrays that is often not taught or missed in java classes  When arrays are passed to a function  then another pointer is created to the same array   the same pointer is never passed    You can manipulate the array using both the pointers  but once you assign the second pointer to a new array in the called method and return back by void to calling function  then the original pointer still remains unchanged   You can directly run the code here   https   www compilejava net   import java util Arrays   public class HelloWorld       public static void main String   args                int Main Array      20 19 18 4 16 15 14 4 12 11 9           Demo1 Demo1 Main Array              THE POINTER Main Array IS NOT PASSED TO Demo1            A DIFFERENT POINTER TO THE SAME LOCATION OF Main Array IS PASSED TO Demo1          System out println  Main Array     Arrays toString Main Array               outputs   Main Array    20  19  18  4  16  15  14  4  12  11  9             Since Main Array points to the original location             I cannot access the results of Demo1   Demo2 when they are void             I can use array clone method in Demo1 to get the required result             but it would be faster if Demo1 returned the result to main          public class Demo1       public static void Demo1 int A                  int B     new int A length           System out println  B     Arrays toString B       output   B    0  0  0  0  0  0  0  0  0  0  0          Demo2 Demo2 A B           System out println  B     Arrays toString B       output   B    9999  0  0  0  0  0  0  0  0  0  0          System out println  A     Arrays toString A       output   A    20  19  18  4  16  15  14  4  12  11  9           A   B             A was pointing to location of Main Array  now it points to location of B            Main Array pointer still keeps pointing to the original location in void main          System out println  A     Arrays toString A       output   A    9999  0  0  0  0  0  0  0  0  0  0             Hence to access this result from main  I have to return it to main         public class Demo2       public static void Demo2 int AAA   int BBB                  BBB 0    9999             BBB points to the same location as B in Demo1  so whatever I do            with BBB  I am manipulating the location  Since B points to the            same location  I can access the results from B

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public static void main String   args         int   A new int size           code for take input in array       int   C sorting A     pass array via method         and then print array        public static int   sorting int   a           code for work with array       return a    retuen array

[java] pass array to method Java

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