How to swap objects in Java?

Suppose we have a class named " Car" which has some properties. Then we created two Car objects, for example, car1 and car2, how to exchange the data of car1 and car2?

Swapping or exchanging objects in Java involves swapping the references of two objects. In Java, objects are passed by reference, which means that the reference of the object is passed to a method or function, rather than the actual object itself. Therefore, swapping two objects involves exchanging their references.

One way to swap objects in Java is by using a temporary variable. Here's an example: 

// Create two objects
String object1 = "Hello";
String object2 = "World";

// Swap the objects using a temporary variable
String temp = object1;
object1 = object2;
object2 = temp;

// Output the swapped objects
System.out.println(object1); // Output: World
System.out.println(object2); // Output: Hello

In the above example, we created two String objects object1 and object2. We then swapped the objects by using a temporary variable temp to store the value of object1, then assigned object2 to object1, and finally assigned temp to object2.

Another way to swap objects is by using the Collections.swap() method in the java.util package. This method swaps the elements at the specified positions in a list. Here's an example: 

// Create a list of objects
List list = new ArrayList<>();
list.add("Hello");
list.add("World");

// Swap the objects using the Collections.swap() method
Collections.swap(list, 0, 1);

// Output the swapped objects
System.out.println(list.get(0)); // Output: World
System.out.println(list.get(1)); // Output: Hello

In the above example, we created a list of String objects list and added two elements to it. We then swapped the objects by using the Collections.swap() method and passing the list and the indices of the elements to be swapped.