字符串上的split（）方法不起作用

Question

i want to split a string which contains +, im using split() on String object as: but it shows exception.

class StringTest 
{
    public static void main(String[] args) 
    {
        String val= "004+0345564";
        String arr[]=val.split("+");
        for(int i=0;i<=arr.length-1;i++){
            System.out.println(arr[i]);
        }
    }
}

Answer 1

String.split takes a regular expression as its argument. A + in a regular expression has a special meaning. (One or more of previous).

If you want a literal + , you need to escape it using \\\\+ . (The regular expression grammar is \\+ but you need to escape the backslash itself in Java using a second backslash).

Answer 2

String arr[] = val.split("\\+");

代替

String arr[]=val.split("+");

Answer 3

Split takes regex. You need to escape +

String arr[]=val.split("\\+")

Answer 4

String arr[] = val.split("\\+");

Answer 5

try this

class StringTest 
{
    public static void main(String[] args) 
    {
        String val= "004+0345564";
        String arr[]=val.split("\\+");
        for(int i=0;i<=arr.length-1;i++){
            System.out.println(arr[i]);
        }
    }
}

Answer 6

You need to use

    String arr[] = val.split("\\+");

Instead of

    String arr[]=val.split("+");

The split method takes regex as inputs. You can also refer String#split to confirm the same.

Answer 7

Actual syntax is

public String[] split(String regex, int limit)

//or

public String[] split(String regex)

So use, below one.

String arr[] = val.split("\\+",0);