What are the characteristics of java state pattern

1. Features

The state class has the same public method

The state class has an attribute pointing to the entity class that uses this state

State The class automatically switches states internally, and the user cannot perceive it

Used to replace large blocks of repeated if statements

2, examples

package com.journaldev.design.state;
 
public class TVStartState implements State {
 
@Override
public void doAction() {
System.out.println("TV is turned ON");
}
 
}

Java has Which collection classes

Collections in Java are mainly divided into four categories:

1. List: ordered and repeatable;

2.Queue: Yes Ordered, repeatable;

3. Set collection: non-repeatable;

4. Map mapping: unordered, with unique keys and non-unique values.

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