add an element to int array in java

Question

Want to add or append elements to existing array  int   series    4 2     now i want to update the series dynamically with new values i send    like if i send 3 update series  as int   series    4 2 3    again if i send 4 update series  as int   series    4 2 3 4    again if i send 1 update series  as int   series    4 2 3 4 1   so on   How to do it      I generate an integer every 5 minutes in some other function and want to send to update the int   series array

User · Answer

class AddElement        public static void main String s              int arr     2 3           int add     new int arr length 1           for int i 0 i lt add length i             if i  add length-1               add i  4           else              add i  arr i                     System out println add i

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try this  public static void main String   args        int   series    4 2       series   addElement series  3       series   addElement series  1      static int   addElement int   a  int e        a    Arrays copyOf a  a length   1       a a length - 1    e      return a

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The size of an array can t be changed  If you want a bigger array you have to create a new array   However  a better solution would be to use an  Array List which can grow as you need it  The method ArrayList toArray T   a  returns an array if you need to use an array in your application

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The     can only be used in JDK 1 5 or later  If you are using JDK 4 or lower  use this code    public static int   addElement int   original  int newelement        int   nEw   new int original length   1       System arraycopy original  0  nEw  0  original length       nEw original length    newelement      otherwise  JDK 5 or higher    public static int   addElement int   original  int    elements       This can add multiple elements at once  addElement int    int  will still work though      int   nEw   new int original length   elements length       System arraycopy original  0  nEw  0  original length       System arraycopy elements  0  nEw  original length  elements length       return nEw      Of course  as many have mentioned above  you could use a Collection or an ArrayList  which allows you to use the  add   method

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Like others suggested you are better off using collection  If you however for some reason must stick to array then Apache Commons ArrayUtils may help   int   series    4 2   series   ArrayUtils add series  3      series is now  4 2 3  series   ArrayUtils add series  4      series is now  4 2 3 4     Note that the add method creates a new array  copies the given array and appends the new element at the end  which may have impact on performance

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import java util Arrays   public class NumberArray             public static void main String   args           int   series    4 2           int   newSeries   putNumberInSeries 1 series           System out println series  newSeries    return false  you won t get the same int   object  But functionality achieved            private static int   putNumberInSeries int i  int   series            int   localSeries   Arrays copyOf series  series length 1           localSeries series length    i          System out println localSeries           return localSeries

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similar to Evgeniy   int   series    4 2      add element 3     add element 4     add element 1     public void add element int element     series   Arrays copyOf series  series length  1     series series length - 1    element

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This works for me   int   list   new int maximum   for  int i   0  i  lt  maximum  i        list i    put input here      This way  it s simple  yet efficient

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If you are generating an integer every 5 minutes  better to use collection  You can always get array out of it  if required in your code   Else define the array big enough to handle all your values at runtime  not preferred though

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You ll need to create a new array if you want to add an index   Try this   public static void main String   args        int   series   new int 0       int x   5        series   addInt series  x          print out the array with commas as delimiters     System out print  New series          for  int i   0  i  lt  series length  i             if  i    series length - 1               System out println series i                      else              System out print series i                                  here  create a method  public static int   addInt int    series  int newInt         create a new array with extra index     int   newSeries   new int series length   1          copy the integers from series to newSeries         for  int i   0  i  lt  series length  i             newSeries i    series i           add the new integer to the last index          newSeries newSeries length - 1    newInt         return newSeries

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The length of an array is immutable in java  This means you can t change the size of an array once you have created it  If you initialised it with 2 elements  its length is 2  You can however use a different collection   List lt Integer gt  myList   new ArrayList lt Integer gt     myList add 5   myList add 7     And with a wrapper method  public void addMember Integer x        myList add x

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You could also try this    public static int   addOneIntToArray int   initialArray   int newValue         int   newArray   new int initialArray length   1       for  int index   0  index  lt  initialArray length  index              newArray index    initialArray index              newArray newArray length - 1    newValue      return newArray

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int   oldArray    1 2 3 4 5          new value     int newValue   10         define the new array     int   newArray   new int oldArray length   1          copy values into new array     for int i 0 i  lt  oldArray length i            newArray i    oldArray i         another solution is to use        System arraycopy oldArray  0  newArray  0  oldArray length          add new value to the new array     newArray newArray length-1    newValue         copy the address to the old reference        the old array values will be deleted by the Garbage Collector     oldArray   newArray

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public int   return Array      int   a  new int 10      int b   25  for int i 0  i lt 10  i                         a i    b   i        return a

[java] add an element to int [] array in java

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