ensureCapacity (int minimumCapacity)

public synchronized void ensureCapacity(int minimumCapacity)

Ensures that the capacity is at least equal to the specified minimum. If the current capacity is less than the argument, then a new internal array is allocated with greater capacity. The new capacity is the larger of:

   1. The minimumCapacity argument.

   2. Twice the old capacity, plus 2. 

public class StringBufferEnsureCapacity {
     public static void main(String args[]){
        StringBuffer str1 = new StringBuffer("Hi How are you");
        
        System.out.println("str1 capacity is");
        System.out.println(str1.capacity());
        
        System.out.println("str1 capacity is");
        str1.ensureCapacity(50);
        System.out.println(str1.capacity());
    }       
}

Output

str1 capacity is
30
str1 capacity is
62

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