# What does the method ensureCapacity(int, minCapacity) do in java?

Java 8Object Oriented ProgrammingProgramming

The ensureCapacity(int minCapacity) method of the class java.util.ArrayList increases the capacity of this ArrayList instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument.

## Example

import java.util.ArrayList;

public class ArrayListDemo {
public static void main(String args[]) {
ArrayList<Integer> arrlist = new ArrayList<Integer>(5);
arrlist.ensureCapacity(15);
for (Integer number : arrlist) {
System.out.println("Number = " + number);
}
}
}

## Output

Number = 10
Number = 50
Number = 30
Published on 08-Feb-2018 09:07:35