EN
Java - iterate string backwards
0 points
In this article, we would like to show you how to iterate string backwards in Java.
Quick solution:
xxxxxxxxxx1
String text = "ABC";2
3
for (int i = text.length() - 1; i >= 0; i--) {4
System.out.print(text.charAt(i));5
}
In this example, we use simple for loop to iterate the text string backwards.
xxxxxxxxxx1
public class Example {2
3
public static void main(String[] args) {4
String text = "ABC";5
6
for (int i = text.length() - 1; i >= 0; i--) {7
System.out.print(text.charAt(i));8
}9
}10
}Output:
xxxxxxxxxx1
CBAIn this example, we use String split() method with empty string ("") as a separator to split the text string into array of strings (letters). Then we iterate through the letters array using simple for loop.
xxxxxxxxxx1
public class Example {2
3
public static void main(String[] args) {4
String text = "ABC";5
6
String[] letters = text.split("");7
8
for (int i = letters.length - 1; i >= 0; i--) {9
System.out.print(letters[i]);10
}11
}12
}Output:
xxxxxxxxxx1
CBAIn this example, we create new StringBuilder object from the text string, reverse it and convert to characters array. Then we simply iterate over the characters array using enhanced for loop.
xxxxxxxxxx1
public class Example {2
3
public static void main(String[] args) {4
String text = "ABC";5
6
char[] characters = new StringBuilder(text)7
.reverse()8
.toString()9
.toCharArray();10
11
for (char ch : characters) {12
System.out.print(ch);13
}14
}15
}Output:
xxxxxxxxxx1
CBA In this example, we use the CharacterIterator with its last() and previous() methods to iterate the text string backwards.
xxxxxxxxxx1
import java.text.CharacterIterator;2
import java.text.StringCharacterIterator;3
4
public class Example {5
6
public static void main(String[] args) {7
String text = "ABC";8
9
CharacterIterator iterator = new StringCharacterIterator(text);10
11
char character = iterator.last();12
while (character != CharacterIterator.DONE) {13
System.out.print(character);14
character = iterator.previous();15
}16
}17
}Output:
xxxxxxxxxx1
CBA