java.lang.StringBuffer replace(int start,int end,String str)

Description :

This java tutorial shows how to use the replace(int start,int end,String str) method of StringBuffer class under java.lang package.

This method replaces the characters in a substring of this sequence with characters in the specified String. The substring begins at the specified start and extends to the character at index end – 1 or to the end of the sequence if no such character exists. First the characters in the substring are removed and then the specified String is inserted at start. Make a note that this sequence will be lengthened to accommodate the specified String if necessary.

Method Syntax :

public StringBuffer replace(int start,int end,String str)

Parameter Input :

DataType Parameter Description
int start the beginning index
int end the ending index
String str the String that will be replaced on the stringbuffer contents.

Method Returns :

The replace() method of String class returns this StringBuffer object with its characters replaced by the str method argument.

Compatibility Version :

Requires Java 1.2 and up

Java Code Example :

This java example source code demonstrates the use of replace(int start,int end,String str) method of StringBuffer class. Initially the code assigns a string “javatutorialhq.com” as initial contents of the string buffer. Then we use replace method to replace the characters from index 2 to index 5 with string “VATUTO”. As you would have noticed the number of characters is greater that the number than the length of index 2 to 5. Remember the rule that this sequence will be lengthened to accommodate the specified String if necessary.

Sample Output :

Running the above example source code will give the following output

replace(int start,int end,String str) method example

replace(int start,int end,String str) method example

Exception Scenario :

StringIndexOutOfBoundsException

The above exception will be if the following condition has been met:

  • if start is negative
  • start is greater than the StringBuffer length
  • start is greater than the end index

Suggested Reading List :

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