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StringBufferCheat.java

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/*

# StringBuilder

http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuffer.html

Mutable string. Implements `CharSequence` which is the main interface of String.

May be more efficient than `+` on String as it may avoid string object creation.

Smart compilers can optimize this out for simple `+`: http://stackoverflow.com/a/8595943/895245

but not necessarily inside loops: http://stackoverflow.com/a/30451908/895245

So just use it yourself.

*/

public class StringBufferCheat {

public static void main(String[] args) {

StringBuilder sb = new StringBuilder("ab");

sb.append("cd");

sb.append("ef");

assert sb.toString().equals("abcdef");

// ERROR: + does not work: the magic is just for String

//sb = sb + sb;

}

}