Understand working of String Builder and String Buffer

0 votes

What is the main difference between StringBuffer and StringBuilder? Is there any performance issues when deciding on any one of these?

May 9, 2018 in Java by parth295
• 4,590 points
122 views

2 answers to this question.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
0 votes

StringBuilder is faster than StringBuffer because it's not synchronized.

Here's a simple benchmark test:

public class Main {
    public static void main(String[] args) {
        int N = 77777777;
        long t;

        {
            StringBuffer sb = new StringBuffer();
            t = System.currentTimeMillis();
            for (int i = N; i --> 0 ;) {
                sb.append("");
            }
            System.out.println(System.currentTimeMillis() - t);
        }

        {
            StringBuilder sb = new StringBuilder();
            t = System.currentTimeMillis();
            for (int i = N; i > 0 ; i--) {
                sb.append("");
            }
            System.out.println(System.currentTimeMillis() - t);
        }
    }
}

test run gives the numbers of 2241 ms for StringBuffer vs 753 ms for StringBuilder

answered May 9, 2018 by developer_1
• 3,220 points
0 votes
Basically, StringBuffer methods are synchronized while StringBuilder are not.

The operations are "almost" the same, but using synchronized methods in a single thread is overkill.
answered Aug 29, 2018 by Sushmita
• 6,820 points

Related Questions In Java

0 votes
2 answers

How do I read and convert an InputStream object to string type?

You can also use Java Standard Library ...READ MORE

answered Jul 17, 2018 in Java by Sushmita
• 6,820 points
1,471 views
0 votes
1 answer

How do I create a Java string from the contents of a file?

If you're looking for an alternative that ...READ MORE

answered Apr 19, 2018 in Java by Rishabh
• 3,520 points
59 views
0 votes
2 answers

Counting no of Occurrence of a particular character inside a string in Java

We can find out the no. of ...READ MORE

answered Sep 7, 2018 in Java by Sushmita
• 6,820 points
121 views
0 votes
2 answers

What is the use of toString method in Java and how can I use it ?

Whenever you require to explore the constructor ...READ MORE

answered Aug 23, 2018 in Java by Daisy
• 8,020 points
146 views
0 votes
3 answers

Check if a String is numeric in Java

Java 8 Lambda Expression is used: String someString ...READ MORE

answered Sep 3, 2018 in Java by Daisy
• 8,020 points
441 views
0 votes
2 answers

Ho do I Iterate through a HashMap which contains duplicate values

for (Map.Entry<String, String> item : params.entrySet()) { ...READ MORE

answered Jul 24, 2018 in Java by samarth295
• 2,190 points
76 views
0 votes
2 answers

Performing Iteration over each entry in a 'Map'

In Java 8 you can do it ...READ MORE

answered Oct 24, 2018 in Java by Sushmita
• 6,820 points
31 views
0 votes
2 answers

Generate an alpha-numeric string randomly

Java supplies a way of doing this ...READ MORE

answered Jul 18, 2018 in Java by Daisy
• 8,020 points
92 views
0 votes
1 answer

How can I invoke a method when the method name is in the form of a given string?

I tried doing it this way - java.lang.reflect.Method ...READ MORE

answered Apr 27, 2018 in Java by developer_1
• 3,220 points
29 views
0 votes
1 answer

Converting String and Float Data-types

Using Java’s Float class. float f = Float.parseFloat("25"); String s = ...READ MORE

answered May 9, 2018 in Java by developer_1
• 3,220 points
34 views

© 2018 Brain4ce Education Solutions Pvt. Ltd. All rights Reserved.
"PMP®","PMI®", "PMI-ACP®" and "PMBOK®" are registered marks of the Project Management Institute, Inc. MongoDB®, Mongo and the leaf logo are the registered trademarks of MongoDB, Inc.