Java 字符串时间比较方法：compareTo() 和 Date 转换

Java\u4e2d\u7684String\u7c7b\u578b\u65f6\u95f4\u6bd4\u8f83\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\uff1a\n\n1. \u4f7f\u7528compareTo()\u65b9\u6cd5\u8fdb\u884c\u6bd4\u8f83\u3002\u8be5\u65b9\u6cd5\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u8bcd\u5178\u987a\u5e8f\uff0c\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u503c\uff0c\u5982\u679c\u5b57\u7b26\u4e32\u76f8\u7b49\uff0c\u5219\u8fd4\u56de0\uff1b\u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5c0f\u4e8e\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u4e32\uff0c\u5219\u8fd4\u56de\u8d1f\u6570\uff1b\u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5927\u4e8e\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u4e32\uff0c\u5219\u8fd4\u56de\u6b63\u6570\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a\n\njava\nString time1 = \"2021-01-01 10:00:00\";\nString time2 = \"2021-01-01 11:00:00\";\nint result = time1.compareTo(time2);\nif(result < 0) {\n System.out.println(\"time1\u5728time2\u4e4b\u524d\");\n} else if(result == 0) {\n System.out.println(\"time1\u548ctime2\u76f8\u7b49\");\n} else {\n System.out.println(\"time1\u5728time2\u4e4b\u540e\");\n}\n\n\n2. \u5c06String\u7c7b\u578b\u7684\u65f6\u95f4\u8f6c\u6362\u4e3aDate\u7c7b\u578b\uff0c\u5728\u4f7f\u7528compareTo()\u65b9\u6cd5\u8fdb\u884c\u6bd4\u8f83\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a\n\njava\nSimpleDateFormat format = new SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\");\nString time1 = \"2021-01-01 10:00:00\";\nString time2 = \"2021-01-01 11:00:00\";\nDate date1 = format.parse(time1);\nDate date2 = format.parse(time2);\nint result = date1.compareTo(date2);\nif(result < 0) {\n System.out.println(\"time1\u5728time2\u4e4b\u524d\");\n} else if(result == 0) {\n System.out.println(\"time1\u548ctime2\u76f8\u7b49\");\n} else {\n System.out.println(\"time1\u5728time2\u4e4b\u540e\");\n}\n\n\n\u6ce8\u610f\uff1a\u5728\u4f7f\u7528SimpleDateFormat\u8fdb\u884c\u65f6\u95f4\u683c\u5f0f\u5316\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528\u4e0e\u65f6\u95f4\u5b57\u7b26\u4e32\u76f8\u540c\u7684\u683c\u5f0f\uff0c\u5426\u5219\u4f1a\u51fa\u73b0\u8f6c\u6362\u5f02\u5e38\u3002