Java Vector trimToSize() Method

The trimToSize() method of Java Vector class is used to trim the capacity of the vector to be the vector's current size. An application can use this operation to minimize the storage of a vector.

Syntax

Following is the declaration of trimToSize() method:

Parameter

This method does not accept any parameter.

Return

The trimToSize() method does not return anything. It trims the capacity of the given vector with the current size.

Exceptions

Compatibility Version

Java 1.2 and above

Example 1

import java.util.*;
public class VectorTrimToSizeExample1 {  
	public static void main(String arg[]) {	
	    //Create an empty vector 
	    Vector<Integer> vec = new Vector<>(8);
	    //Add elements in the vector
	    vec.add(1);
	    vec.add(2);
	    vec.add(3);
	    vec.add(4);
	    vec.add(5);    
	    //Trims the size to the number of elements
          vec.trimToSize(); 
          System.out.println("The elements of a vector are:");
          //Displaying all the elements
          for (Integer number : vec) {
             System.out.println("Number = " + number);
          }           
      }
}

Test it Now

Output:

The elements of a vector are:
Number = 1
Number = 2
Number = 3
Number = 4
Number = 5

Example 2

import java.util.*;
public class VectorTrimToSizeExample2 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector < String > colors = new Vector < String > (9);
	    //Add elements in the vector
          colors.add("White");
          colors.add("Green");
          colors.add("Black");
          colors.add("Pink"); 
          //Prints size of the vector
          System.out.println("The initial size of the vector: "+colors.capacity());
	    //Trims the size to the number of elements
          colors.trimToSize(); 
          System.out.println("The elements of a vector are:");
          //Displaying all the elements
          for (String strcolor : colors) {
              System.out.println(" " + strcolor);
          }  
          //Prints size of the vector
          System.out.println("Size of the vector after trimToSize(): " +colors.capacity());
      }
}

Test it Now

Output:

The initial size of the vector: 9
The elements of a vector are:
 White
 Green
 Black
 Pink
Size of the vector after trimToSize(): 4

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