Tag: How do you duplicate an array in Java?

In C++ that statement makes a copy of the object’s state. In Java it simply copies the reference. The object’s state is not copied so implicitly calling the copy constructor makes no sense .

If you want to copy the first few elements of an array or a full copy of an array, you can use Arrays. copyOf() method . Arrays. copyOfRange() is used to copy a specified range of an array.26 Eki 2021

We can create an array in constructor as well to avoid the two-step process of declaration and initialization.

The System Class arrayCopy() ; this copies an array from a source array to a destination array, starting the copy action from the source position to the target position till the specified length. The number of elements copied to the target array equals the specified length.10 Eki 2021

Array Copy in Java

A copy constructor in a Java class is a constructor that creates an object using another object of the same Java class . That’s helpful when we want to copy a complex object that has several fields, or when we want to make a deep copy of an existing object.

Deep Copy an Array Using the Arrays. Below, we use the copyOf() method of the Arrays utility class . It accepts the array to copy and its size then returns the array of the same type. We make a new array arr2 using this method and check if changing arr2 changes arr1 or not. The output shows the result.