支持正则表达式的方法:
boolean matches(String regex)
String replaceAll(String regex, String replacement)
String replaceFirst(String regex, String replacement)
String[] split(String regex)
String[] split(String regex, int limit)
不支持正则表达式的方法:
String replace(char oldChar, char newChar)
String replace(CharSequence target, CharSequence replacement)
例:
String string = "com.cls.Test";
System.out.println(string.replace(".", "\\"));
System.out.println(string.replaceAll("\\.", "\\\\"));