Vector : copyInto : Copy Elements Of Vector to Array

public synchronized void copyInto(Object[] anArray)

Copies the components of this vector into the specified array.

import java.util.*;

class VectorCopyInto{
 public static void main(String args[]){
  Vector<Integer> myVector;
  Object myArray[];
  
  myVector = new Vector<> ();
  
  /* Add Elements to myVector */
  for(int i=1; i<6; i++)
   myVector.add(i);
   
  int size = myVector.size();
  myArray = new Object[size]; 
  
  System.out.println("Elements in myVector are");
  System.out.println(myVector);
  
  myVector.copyInto(myArray);
  
  System.out.println("Elements in myArray are");
  for(Object obj:myArray)
   System.out.print(obj + " ");
 }
}

Output

Elements in myVector are
[1, 2, 3, 4, 5]
Elements in myArray are
1 2 3 4 5

1. Throws NullPointerException if the given array is null

import java.util.*;

class VectorCopyIntoNullPointer{
 public static void main(String args[]){
  Vector<Integer> myVector = new Vector<> ();
  Object myArray[] = null;
  
  myVector.copyInto(myArray);
 }
}

Output

Exception in thread "main" java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.util.Vector.copyInto(Vector.java:188)
        at VectorCopyIntoNullPointer.main(VectorCopyIntoNullPointer.java:8)

2. Throws IndexOutOfBoundsException if the specified array is not large enough to hold all the components of this vector

import java.util.*;

class VectorCopyIntoIndexOut{
 public static void main(String args[]){
  Vector<Integer> myVector;
  Object myArray[] = new Object[3];
  
  myVector = new Vector<> ();
  
  /* Add Elements to myVector */
  for(int i=1; i<6; i++)
   myVector.add(i); 
  
  myVector.copyInto(myArray);
 }
}

Output

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(Native Method)
        at java.util.Vector.copyInto(Vector.java:188)
        at VectorCopyIntoIndexOut.main(VectorCopyIntoIndexOut.java:14)

3. Throws ArrayStoreException if a component of this vector is not of a runtime type that can be stored in the specified array

import java.util.*;

class VectorCopyIntoArrayStore{
 public static void main(String args[]){
  Vector<String> myVector;
  Integer myArray[] = new Integer[6];
  
  myVector = new Vector<> ();
  
  /* Add Elements to myVector */
  for(int i=1; i<6; i++)
   myVector.add("i"); 
  
  myVector.copyInto(myArray);
 }
}

Output

Exception in thread "main" java.lang.ArrayStoreException
        at java.lang.System.arraycopy(Native Method)
        at java.util.Vector.copyInto(Vector.java:188)
        at VectorCopyIntoArrayStore.main(VectorCopyIntoArrayStore.java:14)

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