java.util.Arrays

Let's move on to practice, and as an example, we will use the library java.util.Arrays;. We can see that the parent library is java, followed by the child library util, and then the specific library we need, Arrays.

We have already mentioned this library in the course on arrays when discussing array methods. Now, let's see how we can use these methods in code using an example:

Let's go through the code written above.

We import the necessary library and use a class from that library to call its sorting method. You can see the syntax of how we use it: ClassName.methodName(array);. You also can see that the sorted array is printed in the console. The values are displayed from the smallest to the largest. The method we imported from the Arrays library sorted the array.

Note

We will familiarize ourselves with the concepts of methods and classes throughout this section, so don't worry if it seems difficult to grasp at the moment. The main thing to remember now is how and where imports are used.

Let's also take a look at another method from Arrays - fill.

We have the same integer array, but we're not sorting it this time. Instead, we're replacing each element of the array with a specified value. Notice that we first specify the array we want to fill in the parentheses, and then we provide the value with which we want to fill the array.

After all the operations, you can see that the array displayed on the screen consists of all elements equal to 1.