Append An Array Java Code Example

Example 1: how to append to an array in java

import java.util.Arrays;  class ArrayAppend {     public static void main( String args[] ) {       int[] arr = { 10, 20, 30 };       System.out.println(Arrays.toString(arr));        arr = Arrays.copyOf(arr, arr.length + 1);       arr[arr.length - 1] = 40; // Assign 40 to the last element       System.out.println(Arrays.toString(arr));     } }

Example 2: java array add element

// A better solution would be to use an ArrayList which can grow as you need it.  // The method ArrayList.toArray( T[] a )  // gives you back your array if you need it in this form.  List<String> where = new ArrayList<String>(); where.add(element); where.add(element);  // If you need to convert it to a simple array...  String[] simpleArray = new String[ where.size() ]; where.toArray( simpleArray );

Example 3: java add element to existing array

//original array String[] rgb = new String[] {"red", "green"}; //new array with one more length String[] rgb2 = new String[rgb.length + 1]; //copy the old in the new array System.arraycopy(rgb, 0, rgb2, 0, rgb.length); //add element to new array rgb2[rgb.length] = "blue"; //optional: set old array to new array rgb = rgb2;