如何在Java中检查字符串中是否包含多个特定字符

Question

I need to check a string to see if it contains any one of these characters (#, $, %, &) in java. I need to check for all 4 at the same time, with out a loop if possible and without regex. I am using this to verify validity of an email address so I cant just check for special characters as the email contains the @. Is there a way to use the .contains method with a switch statement?

Answer 1

Given a String str , and no loops or regular expressions you could presumable call String.contains(CharSequence) with a series of boolean ands like

if (str.contains("#") && str.contains("$") && str.contains("%")
        && str.contains("&")) {
     System.out.printf("%s contains #$%%&%n", str);
} else {
     System.out.printf("%s does not contain #$%%&%n", str);
}

Answer 2

您应该使用String.contains（...）

Answer 3

String.subString(String foo) allows you to search for specific case sensitive characters.

Foo.subString(String.ignoreCase("bar") will search foo for the string of characters "bar".

This will return the index of the first letter of "bar", and return -1 if the string is not found.