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Size and capacity

Return	Method	Summary
int	capacity()	Returns the current capacity of this vector.
void	ensureCapacity(int minCapacity)	Increases the capacity of this vector, if necessary, to ensure that it can hold at least the number of components specified by the minimum capacity argument.
void	setSize(int newSize)	Sets the size of this vector.
int	size()	Returns the number of components in this vector.
void	trimToSize()	Trims the capacity of this vector to be the vector's current size.


import java.util.Vector;

public class Main{

  public static void main(String args[]) {

    Vector v = new Vector(2000);

    System.out.println(v.capacity());
  }
}

The output:


import java.util.Vector;

public class Main{

  public static void main(String args[]) {

    Vector v = new Vector(2000);

    System.out.println(v.capacity());
    
    v.add("java2s.com");
    
    v.trimToSize();
    
    System.out.println(v.capacity());
    
  }
}

The output:


2000
1

Set size of Vector


import java.util.Vector;

public class Main {
  public static void main(String[] args) {
    Vector v = new Vector();
    v.add("1");
    v.add("2");
    v.add("3");
    v.add("4");
    v.add("java2s.com");
    v.setSize(3);

    System.out.println(v);

    v.setSize(5);

    System.out.println(v);
  }
}

The output:


[1, 2, 3]
[1, 2, 3, null, null]

« Add elements to this vector

Remove all elements from a vector »

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