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Java - iterate through a List in reverse order
0 points
In this article, we would like to show you how to iterate through a List in reverse order in Java.
In this example, we use reversed for loop to iterate through the letters ArrayList in reverse order.
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import java.util.*;2
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public class Example {4
5
public static void main(String[] args) {6
List<String> letters = new ArrayList<>();7
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letters.add("A");9
letters.add("B");10
letters.add("C");11
12
13
for (int i = letters.size(); i-- > 0; ) {14
System.out.println(letters.get(i));15
}16
}17
}Output:
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C2
B3
AIn this example, we create listIterator and iterate through the letters ArrayList in a while loop using hasPrevious() method.
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import java.util.*;2
3
public class Example {4
5
public static void main(String[] args) {6
List<String> letters = new ArrayList<>();7
8
letters.add("A");9
letters.add("B");10
letters.add("C");11
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ListIterator<String> listIterator = letters.listIterator(letters.size());13
14
while (listIterator.hasPrevious()) {15
System.out.println(listIterator.previous());16
}17
}18
}Output:
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C2
B3
AIn this example, we reverse the letters ArrayList to iterate it backwards.
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import java.util.*;2
3
public class Example {4
5
public static void main(String[] args) {6
List<String> letters = new ArrayList<>();7
8
letters.add("A");9
letters.add("B");10
letters.add("C");11
12
System.out.println("ArrayList before reverse: " + letters);13
14
Collections.reverse(letters);15
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System.out.println("ArrayList after reverse: " + letters);17
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// iterate over ArrayList19
for (String letter : letters) {20
System.out.println(letter);21
}22
}23
}Output:
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ArrayList before reverse: [A, B, C]2
ArrayList after reverse: [C, B, A]3
4
C5
B6
A