String是final修饰的,不可变,每次操作都会产生新的String对象;
StringBuffer和StringBuilder都是在原对象上操作;
StringBuffer是线程安全的,StringBuilder现场不安全的
StringBuffer方法都是synchronized(加锁)修饰的,
性能:StringBuilder>StringBuffer>String
场景:经常需要改变字符串内容时使用后面两个
优先使用StringBuilder,多线程使用共享变量时使用StringBuffer
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