Example of StringBuilder in Java

By Arvind Rai, February 21, 2013

StringBuilder has come in java since jdk 1.5. StringBuilder is not synchronized. It cannot be used in multi-threaded environment. StringBuffer can be used in multi-threaded environment. StringBuilder has the methods append, insert and appendCodePoint etc. appendCodePoint can add character ASCI value with the string as

sb.appendCodePoint(90);

90 is ASCII of Z.

package com.concretepage;
public class StringBuilderTest {
    public static void main(String... args) {
        StringBuilder sb = new StringBuilder("Hello");
        //appends the string 
        sb.append(" World");
        //insert the string at specified place
        sb.insert(6, " Great_ ");
        //90 ASCI of Z, it is appended at the end
        sb.appendCodePoint(90);
        System.out.println(sb);
        //gets capacity of string builder object
        int c = sb.capacity();
        System.out.println(c);
    }
}

Output