Strings, Characters and Regular Expressions - Java: How to Program Early Objects - page 616

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18 StringBuilder lastBuffer = new StringBuilder( "last buffer" );

19 StringBuilder buffer = new StringBuilder();

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buffer.append(objectRef)
.append( "%n" )
.append(string)
.append( "%n" )
.append(charArray)
.append( "%n" )
.append(charArray, 0 , 3 )
.append( "%n" )
.append(booleanValue)
.append( "%n" )
.append(characterValue);
.append( "%n" )
.append(integerValue)
.append( "%n" )
.append(longValue)
.append( "%n" )
.append(floatValue)
.append( "%n" )
.append(doubleValue)
.append( "%n" )
.append(lastBuffer);

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System.out.printf( "buffer contains%n%s%n" , buffer.toString());

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}

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} // end StringBuilderAppend

buffer contains
hello
goodbye
abcdef
abc
true
Z
7
10000000000
2.5
33.333
last buffer

Fig. 14.13 | StringBuilder append methods. (Part 2 of 2.)

The compiler can use StringBuilder and the append methods to implement the +
and += String concatenation operators. For example, assuming the declarations

String string1 = "hello" ;
String string2 = "BC" ;
int value = 22 ;

the statement

String s = string1 + string2 + value;