CODEWITHSUNDEEP
javastring
Steffan Harris
Steffan Harris

Reputation: 9326

Mix two strings in Java

I was wondering if it possible to mix two strings in java. Suppose I have

11111

and

22222

What would be the best way to combine them to form?

1212121212

Upvotes: 2

Views: 6897

Answers (4)

fastcodejava
fastcodejava

Reputation: 41097

I wonder if the example given is intentional, i.e they all have 1 char repeated. In that case it is much simpler. If they are not, then other answers are good.

Upvotes: 1

Mike Clark
Mike Clark

Reputation: 10136

Here's an implementation that preserves the remainder of unequal length strings:

public static String mix(String a, String b) {
    final int aLength = a.length();
    final int bLength = b.length();
    final int min = Math.min(aLength, bLength);
    final StringBuilder sb = new StringBuilder(aLength + bLength);
    for(int i = 0; i < min; i++) {
        sb.append(a.charAt(i));
        sb.append(b.charAt(i));
    }
    if (aLength > bLength) {
        sb.append(a, bLength, aLength);
    } else if (aLength < bLength) {
        sb.append(b, aLength, bLength);
    }
    return sb.toString();
}

Upvotes: 2

Bozho
Bozho

Reputation: 597106

Yes - iterate the first string, and for each char in it, append to a builder the char in the same position from the second string (if it exists):

StringBuilder sb = new StringBuilder();
for (int i = 0; i < str1.length(); i++) {
    sb.append(str1.charAt(i));
    if (str.length() > i) {
       sb.append(str2.charAt(i));
    }   
}
return sb.toString();

Upvotes: 1

casablanca
casablanca

Reputation: 70701

Assuming both strings are of equal length, you could simply write a loop to go over the characters and do what you want:

String s1, s2; /* input strings */

StringBuilder sb = new StringBuilder();
for (int i = 0; i < s1.length(); i++) {
  sb.append(s1.charAt(i));
  sb.append(s2.charAt(i));
}

String result = sb.toString();

Upvotes: 4

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