Java String、StringBuilder、StringBuffer区别详解 - 性能、线程安全、使用场景对比

Java\u4e2d\u7684String\u3001StringBuilder\u548cStringBuffer\u90fd\u662f\u7528\u6765\u5904\u7406\u5b57\u7b26\u4e32\u7684\u7c7b\uff0c\u4f46\u662f\u4ed6\u4eec\u6709\u4e00\u4e9b\u533a\u522b\u3002\n\n1\uff0e\u4e0d\u53ef\u53d8\u6027\uff1aString\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u6839\u672c\u8bf4\u4e00\u6b21\u521b\u5efa\u4e00\u4e2aString\u5bf9\u8c61\uff0c\u5c31\u4e0d\u80fd\u53d8\u66f4\u5176\u503c\u3002\u800cStringBuilder\u548cStringBuffer\u662f\u53ef\u53d8\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7\u65b9\u6cd5\u6765\u53d8\u66f4\u4ed6\u4eec\u7684\u503c\u3002\n\n2\uff0e\u7ebf\u7a0b\u5b89\u5168\u6027\uff1aString\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u591a\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u8bfb\u53d6\u4e00\u4e2aString\u5bf9\u8c61\u7684\u503c\uff0c\u4f46\u662f\u4e0d\u80fd\u53d8\u66f4\u5b83\u3002\u800cStringBuilder\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u53ea\u80fd\u7531\u4e00\u4e2a\u7ebf\u7a0b\u64cd\u4f5c\uff0c\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u4e00\u4e2aStringBuilder\u5bf9\u8c61\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u95ee\u9898\u3002StringBuffer\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u591a\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u8bfb\u53d6\u548c\u53d8\u66f4StringBuffer\u5bf9\u8c61\u7684\u503c\u3002\n\n3\uff0e\u6027\u80fd\uff1a\u7531\u4e8eString\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5728\u53d8\u66f4\u5b57\u7b26\u4e32\u7684\u65f6\u5019\uff0c\u6bcf\u6b21\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684String\u5bf9\u8c61\uff0c\u8fd9\u6837\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u6d41\u884c\u5bf9\u8c61\uff0c\u5bfc\u81f4\u5185\u5b58\u5f00\u9500\u548c\u6027\u80fd\u95ee\u9898\u3002\u800cStringBuilder\u548cStringBuffer\u662f\u53ef\u53d8\u7684\uff0c\u53ef\u4ee5\u5728\u539f\u6709\u7684\u5bf9\u8c61\u4e0a\u76f4\u63a5\u53d8\u66f4\uff0c\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u6027\u80fd\u66f4\u597d\u3002StringBuilder\u6bd4StringBuffer\u7684\u6027\u80fd\u7684\u5c0f\u4e00\u70b9\uff0c\u56e0\u4e3aStringBuilder\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e0d\u9700\u8981\u540c\u6b65\u64cd\u4f5c\u3002\n\n4\uff0e\u4f7f\u7528\u573a\u666f\uff1aString\u9002\u5408\u4e8e\u5b57\u7b26\u4e32\u4e0d\u9519\u9519\u53d8\u66f4\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\u5b57\u7b26\u4e32\u7684\u63a5\u52a0\u3001\u5b57\u7b26\u4e32\u7684\u6bd4\u8f83\u7b49\u64cd\u4f5c\u3002StringBuilder\u9002\u5408\u4e8e\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b57\u7b26\u4e32\u9519\u9519\u53d8\u66f4\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\u5faa\u73af\u63a5\u52a0\u5b57\u7b26\u4e32\u3002StringBuffer\u9002\u5408\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b57\u7b26\u4e32\u9519\u9519\u53d8\u66f4\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u63a5\u52a0\u5b57\u7b26\u4e32\u3002\n\n\u603b\u7ed3\u6765\u8bf4\uff0cString\u3001StringBuilder\u548cStringBuffer\u5728\u4e0d\u53ef\u53d8\u6027\u3001\u7ebf\u7a0b\u5b89\u5168\u6027\u3001\u6027\u80fd\u548c\u4f7f\u7528\u573a\u666f\u4e0a\u6709\u6240\u533a\u522b\uff0c\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u6709\u5408\u9002\u7684\u7c7b\u3002