Collections.swap(List, int, int): This method is available in java.util.Collections class of Java.
Syntax:
void java.util.Collections.swap(List<?> list, int i, int j)
This method takes three arguments. This method swaps the elements at the specified positions in the specified list.
Parameters: Three parameters are required for this method.
list: The list in which to swap elements.
i: the index of one element to be swapped.
j: the index of the other element to be swapped.
Throws:
1. IndexOutOfBoundsException - if either i or j is out of range (i < 0 || i >= list.size()|| j < 0 || j >= list.size()).
Approach 1: When no exception
Java
import java.util.ArrayList;import java.util.Collections;import java.util.List;public class Collectionsswap {public static void main(String[] args) {List<Integer> arrlist = new ArrayList<Integer>();arrlist.add(12);arrlist.add(56);arrlist.add(899);arrlist.add(65);arrlist.add(5);int i = 1, j = 4;Collections.swap(arrlist, i, j);System.out.println(arrlist);}}
Output:
[12, 5, 899, 65, 56]
Approach 2: IndexOutOfBoundsException
Java
import java.util.ArrayList;import java.util.Collections;import java.util.List;public class Collectionsswap {public static void main(String[] args) {List<Integer> arrlist = new ArrayList<Integer>();arrlist.add(12);arrlist.add(56);arrlist.add(899);arrlist.add(65);arrlist.add(5);int i = 1, j = 14;Collections.swap(arrlist, i, j);System.out.println(arrlist);}}
Output:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index 14 out of bounds for length 5 at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64) at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70) at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248) at java.base/java.util.Objects.checkIndex(Objects.java:359) at java.base/java.util.ArrayList.set(ArrayList.java:441) at java.base/java.util.Collections.swap(Collections.java:501)
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