![Example
public class mybuffers{
public static void main(String args[]){
StringBuffer buffer = new StringBuffer(“Hi”);
buffer.append(“Bye”);
System.out.println(buffer);
}
}
• This program appends the string Bye to Hi and
prints it to the screen.](https://image.slidesharecdn.com/stringsstringbuilderstringbuffer-231003060211-ab9a9a2c/85/Strings-StringBuilder-StringBuffer-ppt-5-320.jpg)
Strings, StringBuilder, StringBuffer.ppt
- 2. String • Strings in java are immutable • Once created they cannot be altered and hence any alterations will lead to creation of new string object
- 3. Example • String s1 = “Example” • String s2 = new String(“Example”) • String s3 = “Example” • The difference between the three statements is that, s1 and s3 are pointing to the same memory location i.e. the string pool. s2 is pointing to a memory location on the heap. • Using a new operator creates a memory location on the heap. • Concatinting s1 and s3 leads to creation of a new string in the pool.
- 4. StringBuffer • StringBuffer is a synchronized and allows us to mutate the string. • StringBuffer has many utility methods to manipulate the string. • This is more useful when using in a multithreaded environment. • Always has a locking overhead.
- 5. Example public class mybuffers{ public static void main(String args[]){ StringBuffer buffer = new StringBuffer(“Hi”); buffer.append(“Bye”); System.out.println(buffer); } } • This program appends the string Bye to Hi and prints it to the screen.
- 6. StringBuilder • StringBuilder is the same as the StringBuffer class • The StringBuilder class is not synchronized and hence in a single threaded environment, the overhead is less than using a StringBuffer.