CODEWITHSUNDEEP
javastring
user8838577
user8838577

Reputation:

Swap character groups in String in java?

I want to swap character groups in a String. For example:

swap("aabbcdefg","aa","bb")  = bbaacdefg

swap("aabbcdefg","aa","efg") = efgbbcdaa

I did something like this:

static String swap(String val, String sub1, String sub2)
    {

        String temp="tt";
        val= val.replace(sub1,temp);
        val= val.replace(sub2,sub1);       
        val= val.replace(temp,sub2);
        return val;
    }

Can I do it in more efficient way?

Upvotes: 1

Views: 76

Answers (1)

Richie Bendall
Richie Bendall

Reputation: 9172

The original code would break if trying to handle tt.

This code splits by sub1, loops through and replaces sub2 with sub1 and joins with sub2.

static String swap(String val, String sub1, String sub2)
    {
        String[] items = val.split(sub1);
        for (int i=0; i<items.length; i++) 
        { 
            items[i] = items[i].replace(sub2, sub1);
        }
        return String.join(sub2, items);
    }

Upvotes: 2

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