Usage code example of list in Java collection

The list interface is a sub interface of the collection interface. List has an important implementation class - ArrayList class. The elements in the list are ordered and repeatable, so it is called sequence.

List can accurately control the insertion position of each element or delete a certain position element. Its implementation class ArrayList is implemented by array.

There are methods of adding, deleting, modifying and querying in the list, which can be demonstrated by examples:

We demonstrate the method of adding, deleting, modifying and checking courses in the list by selecting courses for students

Create a student class

Create a class for an alternative course

You can add courses using the add method in the list

Use the get method to get the content at the specified location, and use the for loop to traverse the content of the course

To traverse the contents of the list, in addition to using the for loop, you can also use iterators, foreach and other methods

To modify the elements in the list, you can use the set method

There are two ways to delete elements in the list. One is to use the remove method

You can also use the removeAll method to delete an array of course types

summary

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