替换字符串replace和replaceAll的使用

replace就是java的替换，“\\” --> “\”

replaceAll是在replace的基础上再被正则表达式替换，“\\\\” --> “\”

①

String s = "\\a\\b";

System.out.println(s); // \a\b



②

String s = "/a/b";
String s1 = s.replace("/","\\");
System.out.println(s1); // \a\b



③

String s = "\\a\\b";
String s1 = s.replaceAll("\\\\","\\\\\\\\"); // 等价于 String s1 = s.replace("\\","\\\\");
System.out.println(s1); // \\a\\b