Remove all numbers and "{" from a String Array

Question

I am trying to remove all non numeric characters from the String Array as require to compare it with the list of numbers. The split works but I am not able to compare the two Sets

for(String w:a1)
    {
        w=w.replaceAll("[^\\d.]", "");

        if(dContacts.getNumber().equals(w))
        {
            System.out.println("Compared1234567");
        }

        System.out.println("---6545678909876789876hijkhijkhijkjh"+dContacts.getNumber());
        System.out.println("Arraylistextract"+w);
    }

Why does `String a = "hello"; a.concat(" world!"); System.out.println(a);` not print "hello world!"? — user253751, Dec 12 '14 at 11:59

score 1 · Accepted Answer · answered Dec 12 '14 at 11:59

1

In Java, Strings are immutable. This means that w.replaceAll("[^\\d.]", ""); will create a different String, and w will remain the same. Assign that expression to w to store it:

w = w.replaceAll("[^\\d.]", "");

answered Dec 12 '14 at 11:59

August

12,410
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score 0 · Answer 2 · answered Dec 12 '14 at 12:01

0

You cannot modify a string without reassigning it to either the same variable or a new one.

answered Dec 12 '14 at 12:01

abhati

309
1
6

score 0 · Answer 3 · answered Dec 12 '14 at 12:03

0

String is Immutable so if you are calling some function then it will not change in same object.

you have to change this line to

w= w.replaceAll("[^\\d.]", "");

answered Dec 12 '14 at 12:03

Prashant

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Remove all numbers and "{" from a String Array

3 Answers3