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StringBuilder类-CZ小蚂蚱
source link: http://blog.51cto.com/13587708/2084585
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1.1StringBuilder类概述StringBuilder:是一个可变的字符串。字符串缓冲区类。String和StringBuilder的区别：String的内容是固定的StringBuilder的内容是可变的1.1.1+=拼接字符串耗费内存原因:每次拼接都会产生新的字符串对象,而利用StringBuilder来拼接字符串自始至终用的都是同一个StringBuilder容器1.2String
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