Java removes simple instances of duplicate objects

Examples are as follows:

Solution idea: create a temporary container ArrayList to store non duplicate objects. Input non duplicate objects by using the iterator twice to take out the objects.

Note here that you need to define an equals method in the person class to compare whether there are the same elements. Instance is used to judge whether the object belongs to this class. If it belongs to this class, it returns true; otherwise, it returns false

Note that equals methods are invoked when calling contains and remove methods in ArrayLis and other containers in Java programming. This is a knowledge point that many people don't pay attention to.

The above is a simple example of removing duplicate objects in Java brought by Xiaobian. I hope you can support programming tips~