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StringBuilder capacity() in Java with Examples

  • Last Updated : 28 Jun, 2021

The capacity() method of StringBuilder Class is used to return the current capacity of StringBUilder object. The capacity is the amount of storage available to insert new characters.
Syntax: 
 

public int capacity()

Return Value: This method returns the current capacity of StringBuilder Class.
Below programs demonstrate the capacity() method of StringBuilder Class:
Example 1:
 

Java




// Java program to demonstrate
// the capacity() Method.
 
class GFG {
    public static void main(String[] args)
    {
 
        // create a StringBuilder object,
        // default capacity will be 16
        StringBuilder str = new StringBuilder();
 
        // get default capacity
        int capacity = str.capacity();
 
        System.out.println("Default Capacity of StringBuilder = "
                           + capacity);
 
        // add the String to StringBuilder Object
        str.append("Geek");
 
        // get capacity
        capacity = str.capacity();
 
        // print the result
        System.out.println("StringBuilder = " + str);
        System.out.println("Current Capacity of StringBuilder = "
                           + capacity);
    }
}
Output
Default Capacity of StringBuilder = 16
StringBuilder = Geek
Current Capacity of StringBuilder = 16

Example 2: 
 

Java




// Java program to demonstrate
// the capacity() Method.
 
class GFG {
    public static void main(String[] args)
    {
        // create a StringBuilder object
        // with a String passed as parameter
        StringBuilder
            str
            = new StringBuilder("WelcomeGeeks");
 
        // get capacity
        int capacity = str.capacity();
 
        // print the result
        System.out.println("StringBuilder = " + str);
        System.out.println("Capacity of StringBuilder = "
                           + capacity);
    }
}
Output: 
StringBuilder = WelcomeGeeks
Capacity of StringBuilder = 28

 

Reference: 
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#capacity()
 


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