public void trimToSize()

// Java program to demonstrate
// the trimToSize() Method.
  
class GFG {
    public static void main(String[] args)
    {
  
        // create a StringBuilder object
        // with a String pass as parameter
        StringBuilder str
            = new StringBuilder("GeeksForGeeks");
  
        // add more string to StringBuilder
        str.append("Contribute");
  
        // print capacity
        System.out.println("Capacity before "
                           + "applying trimToSize() = "
                           + str.capacity());
  
        // applying trimToSize() Method
        str.trimToSize();
  
        // print string
        System.out.println("String = " + str.toString());
  
        // print capacity
        System.out.println("Capacity after"
                           + " applying trimToSize() = "
                           + str.capacity());
    }
}

Capacity before applying trimToSize() = 29
String = GeeksForGeeksContribute
Capacity after applying trimToSize() = 23

// Java program to demonstrate
// the trimToSize() Method.
  
class GFG {
    public static void main(String[] args)
    {
  
        // create a StringBuilder object
        // with a String pass as parameter
        StringBuilder str
            = new StringBuilder();
  
        // add more string to StringBuilder
        str.append("GeeksForGeeks classes");
  
        // print capacity
        System.out.println("Capacity before"
                           + " applying trimToSize() = "
                           + str.capacity());
  
        // applying trimToSize() Method
        str.trimToSize();
  
        // print string
        System.out.println("String = " + str.toString());
  
        // print capacity
        System.out.println("Capacity after "
                           + "applying trimToSize() = "
                           + str.capacity());
    }
}

Capacity before applying trimToSize() = 34
String = GeeksForGeeks classes
Capacity after applying trimToSize() = 21