StringBuilder in Java

Unlike String, StringBuilder is mutable in nature. The API of this class is compatible with StringBuffer except that the StringBuilder is unsafe in a multithreaded environment. It is not synchronized so should it should not be used where thread safety is of prime concern.

It has two important methods append() and insert().

The append("x") function appends "x" at the end of existing StringBuilder.

The insert(5, "x") function inserts the string "x" at the provided index of existing StringBuilder. In this case, it is 5.

StringBuilder sb=new StringBuilder("Initial");  //Initial

sb.append("Appended");  //InitialAppended

sb.insert(7, "Inserted");   //InitialInsertedAppended

To convert a StringBuilder to String we use toString() method. 

  String str = sb.toString();
                                                              

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