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Java StringBuilder setLength() method with example

StringBuilder Class setLength() method: Here, we are going to learn about the setLength() method of StringBuilder Class with its syntax and example.
Submitted by Preeti Jain, on December 22, 2019

StringBuilder Class setLength() method

• setLength() method is available in java.lang package.
• setLength() method is used to sets the length of the character sequence when the sequence is replaced to a new character sequence so the length of the sequence will be assigned by the given argument.
• setLength() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• setLength() method may throw an exception at the time of setting the length of the new character sequence.
  IndexOutOfBoundsException – This exception may throw when the given argument new_len < 0.

Syntax:

    public void setLength(int new_len);

Parameter(s):

• int new_len – represents the new length.

Return value:

The return type of this method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void setLength(int new_len)
// method of StringBuilder 

public class setLength {
    public static void main(String[] args) {
        // Creating an StringBuilder object
        StringBuilder st_b = new StringBuilder("Java World ");

        // Display st_b 
        System.out.println("st_b =" + st_b);

        // Display st_b length
        System.out.println("st_b.length() = " + st_b.length());

        // By using setLength() method is to set the length of
        // st_b object to 4
        st_b.setLength(4);

        // Display st_b 
        System.out.println("st_b=" + st_b);

        // Display new st_b length (i.e. till 4 character to display)
        System.out.println("st_b.setLength() = " + st_b.length());
    }
}

Output

st_b =Java World 
st_b.length() = 11
st_b=Java
st_b.setLength() = 4