Android Java Repeat string x times

Question

I want to repeat a string X times in Android Java.

This, as I understand it, is not a good option:

StringUtils.repeat("abc", 50);

Because it would require

import org.apache.commons.lang.StringUtils; // External libary --- cannot use

So what is the best way to repeat a string X times for Android in Java?

Chris Thoma · Accepted Answer · 2015-08-31 02:26:09Z

5

You could use a stringbuilder and a regular loop. Inside the loop, append the string to the stringbuilder, and then after the loop print the string from the builder.

StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < 50; i++) {
    stringBuilder.append("xyz");
}
String resultString = stringBuilder.toString();

edited Aug 31, 2015 at 2:26

answered Aug 31, 2015 at 2:09

Chris Thoma

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1 Comment

B. Nadolson Over a year ago

Could you provide an example?

Titus · Accepted Answer · 2015-08-31 05:51:21Z

2

You can create your own StringUtils class which has a repeat function that does that, for example:

public class StringUtils{
     public static String repeat(String val, int count){
          StringBuilder buf = new StringBuilder(val.length() * count);
          while (count-- > 0) {
               buf.append(val);
          }
          return buf.toString();
     }
}

edited Aug 31, 2015 at 5:51

answered Aug 31, 2015 at 2:14

Titus

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6 Comments

Chris Thoma Over a year ago

Probably don't want to do this, because since Strings are immutable that "ret += val" will be creating new string objects every time. It's better to use something like a stringbuilder when there's a variable number of strings that would need to be built along the way.

Andreas Over a year ago

Very bad example. Don't use String += String. Never use String += String in a loop. Use a StringBuilder.

Titus Over a year ago

@Andreas thanks for the suggestions, I will change my example to use a StringBuilder instead.

B. Nadolson Over a year ago

A couple of syntax errors ... String str instead of String val and new StringBuilder(count) instead of StringBuilder(outputLength). But otherwise, looks good. Thanks!

hyperneutrino Over a year ago

Also, you can reduce your variable count by replacing for (int i = 0; i < count; i++) with for (;count >= 0; count--).

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