String&StringBuffer&StringBuilder三者之间的区别-经典解析.doc_三者之间的区别英文

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String �ַ��

StringBuffer ��ַ����ȫ��

StringBuilder ��ַ����ȫ��

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�ַ��Ӳ StringBuffer Ч Ҫ String :��

1. String ǲ ɸı ģ StringBuffer ǿ ı ģ StringBuffer Ч�� Ը � � ��

2. String a = "123";

a = a + "456";

��䣬��Ȼa��ֵ�� ı ˣ ʵո �� ڱ��ʱ � һ a һ � һ�� ַ��

ڶ��ִ��ʱ a ţ Ȼ ·�� ͷ � �� ԭ 䡣 a ԭ��ָ��һ String object instance ("123"), a

+ "456" һ µ String object instance ("123456"), Ȼ a �� ָ��µ �

String instance.

3. StringBuffer b = new StringBuffer("asd");

b.append("fgh");

У�� ֻ��b ôһ b һ�� ֱ��ָ��һ StringBuffer instance. append ��

Ҳֻ�Ǹı instance ă�� ݶ��.

4. String s = "Hello"; String b = "world";

String s = s + b;

String�� ֱ��+ ʱ JVM ᴴ һ ʱ StringBuffer � append()��

��ַ��ƴ ӣ ΪString ǲ ɱ ģ ƴ Ӳ ò ʹ StringBuffer� �� ࣨࣨࣨࣨࣨࣨࣨࣨࣨࣨࣨࣨࣨࣨ ң JVM Ὣ"Hello"��

" world!" Ϊ µ String �� ֮ ٽ��ʱStringBuffer��

ת��Ϊһ String�� ۲��ƣ ɼ һ � һ ƴ ӹ У ó � ĸ ƴ ӵ String��

"Hello" " world!" һ ʱStringBuffer StringBuffer� ��

ת� Ϊ String "Hello ͳ� ��

world!" Ȼ s "Hello" ˣ õ û�� 䣬��ָ��µ String� ��

Ҫ ˵ String ͺ StringBuffer ͵ Ҫ ʵ String ǲ ɱ Ķ , ��

ÿ ζ String ͽ иı ʱ ʵ һ µ String Ȼ��  �ָ��ָ��µ �

String . � ǵ�� ַ�Ҫ ѭ ƴ ɶ ʱ String�� ֱ�Ӳ��

ٶ��ϵ ɶ õ ʱStringBuffer �� ͳ�� ٴ��ν ǿ��

��ת��ģ ı��Ծ�� ݵ��ַ��ò Ҫ String Ϊÿ ɶ � ϵ� �� ͳ �� Ӱ�죬�

ڴ��ر��ö JVM GC ͻῪʼ��Ժ� �� ٶ��һ��ġ�

StringBuffer ��ַ����ȫ��

ʹ StringBuffer һ ˣ ÿ ν StringBuffer �� Ͳ

в µĶ�� ٸı á һ Ƽ ʹ StringBuffer ��

�� ַ��ı ¡ ĳЩ�� £ String � ��ַ�ƴ ʵ Ǳ JVM ��

StringBuffer ƴ ӣ Щʱ String �� ͳ ٶȲ StringBuffer ��

��µ��ַ��У String Ч Ҫ StringBuffer ģ� ��Զ ��

String S1 = This is only a + simple + test ;��

StringBuffer Sb = new StringBuilder( This�� is only

a ).append( simple ).append( test );��

�� ȵķ� ��֣ String S1 ��ٶȼ�ֱ��ˣ ʱ StringBuffer Ȼ��

ٶ��ϸ һ� �㶼�� ơ ʵ JVM һ Ϸ JVM ռ�� 

String S1 = This is only a + simple + test ; ʵ ǣ��

String S1 = This is only a simple test ; Ȼ Ҫ‚ ʱ ˡ Ҫ�� Ե� ��

ע��ǣ�� ַ�� String Ļ�� ٶȾ û ô ˣ Ʃ� �� 磺

String S2 = This is only a ;��

String S3 = simple ;��

String S4 = test ;��

String S1 = S2 +S3 + S4;

ʱ JVM �� صؾİ ķ ʽȥ ,�� ԭ ڴ� �� StringBuffer > String

StringBuffer

Java.lang.StringBuffer ��� ȫ Ŀɱ� ��ַ��С һ String � �� ַ��

�ġ Ȼ ʱ ĳ�� ض��ַ��У ĳЩ ÿ ı еĳ Ⱥ�� Ը ��  ݡ�

ɽ� ��ַ��ȫ��ڱ����ڶ�Ҫʱ Щ �� ض�ʵ ϵ в��

ͺ ˳ ģ ˳��Դ�� 漰��ÿ�� �� еķ ˳ һ ¡��

StringBuffer ϵ Ҫ append insert Щ ͵� �� Խ��

ݡ�ÿ Ч�� ת��ؽ��ַ�Ȼ �� ַ��ַ�׷�ӻ��뵽�ַ��С append �

ʼ Щ�� ս�� ַ��ӵ ĩ ˣ insert �� ָ��ĵ��ַ�

�� 磬�� z һ ǰ ǡ start�� ַ��˷ z.append("le") ��

ʹ�� ַ��startle z.insert(4, "le") �� ַ��ʹ֮��starlet��

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YLHsunflower

2013-10-21

写的很详细

jincf2011

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