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Difference Between StringBuffer And StrinBuilder In Java

Differentiate Between StringBuffer And StrinBuilder
 
StringBuilder class is similar to StringBuffer class, except that it is non-synchronized, which means that it is not thread safe and due to this, its methods are also non-synchronized in Java.
 
Let’s see the differences between StringBuffer and StringBuilder are given below.

 StringBuffer  StringBulider
StringBuffer is synchronized, which means two threads cannot call the methods of StringBuffer at the same time. StringBuilder is non-synchronized, which means two threads can call the methods of StringBuilder at the same time.
StringBuffer is slow compared to StringBuilder. StringBuilder is fast compared to StringBuffer.
StringBuffer methods are synchronized. StringBuilder methods are non-synchronized.
StringBuffer is thread safe in Java. StringBuilder is not thread safe in Java.
StringBuffer is old class. it’s there in JDK from first release in Java. StringBuilder is relatively new class. It introduced later in release of JDK 1.5.
 
Example of StringBuffer class.
 
public class BufferExp {
public static void main(String[] args) {
StringBuffer b = new StringBuffer("Bob");
b.append("Dick");
System.out.println(b);
}
}
  
Example of StringBuilder class.
 
public class BuilderExp {
public static void main(String[] args) {
StringBuilder b = new StringBuilder("Peter");
b.append("John");
System.out.println(b);
}
}
 
Let’s check the performance of StringBuffer and StringBuilder.
 
Code
  1. public class PerformanceTest {  
  2.     public static void main(String[] args) {  
  3.         long startTime = System.currentTimeMillis();  
  4.         StringBuffer str = new StringBuffer("Marry");  
  5.         for (int i = 0; i < 10000; i++) {  
  6.             str.append("Jones");  
  7.         }  
  8.         System.out.println("StringBuffer take time: " + (System.currentTimeMillis() - startTime) + "ms");  
  9.         startTime = System.currentTimeMillis();  
  10.         StringBuilder str1 = new StringBuilder("David");  
  11.         for (int i = 0; i < 10000; i++) {  
  12.             str1.append("James");  
  13.         }  
  14.         System.out.println("StringBuilder take time: " + (System.currentTimeMillis() - startTime) + "ms");  
  15.     }  
  16. }  
21

Output

22
 
Summary
 
Thus, we learnt that StringBuilder class is same as StringBuffer class, except that it is non-synchronized and also learnt their differences in Java.