Java String Builder

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Index

1. [[#stringbuilder|StringBuilder]]
2. [[#append|append()]]
3. [[#insert|insert()]]

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StringBuilder

Package: java.lang

Description:
StringBuilder is a mutable sequence of characters. It is part of the java.lang package. It is like String, but can be modified. It is efficient for concatenating multiple strings together.

it can be used toughener with:

• [[#append|append()]]
• [[#insert|insert()]]

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append()

Description:
The append() method appends the string representation of the given argument to the sequence.

Syntax:

StringBuilder sb = new StringBuilder();
sb.append(s);

Parameters:
The append() method takes one parameter:

• s (required): This is the String that is appended to the end of this StringBuilder.

Return Value:
This method returns a reference to this object to enable chaining of calls to methods.

Example:

StringBuilder sb = new StringBuilder("Hello, ");
String str = "world!";
sb.append(str);    // "Hello, world!"

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insert()

Description:
The insert() method inserts the string representation of the second argument into the sequence at the specified position.

Syntax:

StringBuilder sb = new StringBuilder();
sb.insert(index, s);

Parameters:
The insert() method takes two parameters:

• index (required): This is the position at which to insert the second argument.
• s (required): This is the String that is inserted.

Return Value:
This method returns a reference to this object to enable chaining of calls to methods.

Example:

 
StringBuilder sb = new StringBuilder("Hello, world!");
String str = " beautiful";
sb.insert(7, str);    // "Hello, beautiful world!"

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