Java Examples - Extending an Array


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Problem Description

How to extend an array after initialisation?

Solution

Following example shows how to extend an array after initialization by creating an new array.

public class Main {
   public static void main(String[] args) {
      String[] names = new String[] { "A", "B", "C" };
      String[] extended = new String[5];
      extended[3] = "D";
      extended[4] = "E";
      System.arraycopy(names, 0, extended, 0, names.length);
      
      for (String str : extended){
         System.out.println(str);
      }
   }
}

Result

The above code sample will produce the following result.

A
B
C
D
E

The following is an another Sample example of arrays expansion

public class Main {
   public void extendArraySize() {
      String[] names = new String[] {"Sai", "Ram", "Krishna"};
      String[] extended = new String[5];
      extended[3] = "Prasad";
      extended[4] = "Mammahe";
      System.arraycopy(names, 0, extended, 0, names.length);
      
      for (String str : extended) System.out.println(str);
   } 
   public static void main(String[] args) {
      new Main().extendArraySize();
   }
}

The above code sample will produce the following result.

Sai
Ram
Krishna
Prasad
Mammahe

java_arrays.htm

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