Programmer Think

encapsulation Example: //student class public class Student { //Property private get/set private String name; private int age; private char sex; //Provide some public get and set methods //get this data public String getName() { return this.name; } //set assigns a value to this property public void setName(String name) { this ...

Factory mode And Singleton mode Similarly, the factory pattern also belongs to a kind of creative design pattern. Singleton mode is used to ensure that there is only one instance of a class, while factory mode is used to create different objects related to types. It also has different implementation methods. It can be subdivided into simple fa ...

Three features of Java (encapsulation / Inheritance / polymorphism) 1. Encapsulation Benefits of encapsulation: Hide information (permissions) and provide specific method accessEasy to add control statementsConvenient modification and Implementation Specific performance of packaging: Attributes are decorated with private The method is mo ...

Then declare that in the following packaging process, the scope always uses the default scope <!-- Used to compile JSP -- > <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <!--<scope>runtime</scope& ...

problem Let's talk about three questions first and look at the source code with questions: How does the thread pool keep the core thread from dying?If the number of core threads is 0, will new tasks be queued first or run directly? Will the process pool eventually die out?Allow the core thread to timeout. Where is the impact point Examples ...

consumer.registerMessageListener(new MessageListenerOrderly() { @Override public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) { for (MessageExt msg : msgs) { System.out.println(new String(msg.getBody())+" Thread:"+Thread.currentThread( ...

Inner class: put the definition of one class inside the definition of another class. Advantages: organize some logically related classes together (elegant and clear), and control the visibility of internal classes. 10.1 creating internal classes Put the definition of the class inside the peripheral class public class Parcel1 { class Des ...

Comparison between Comparable and Comparator in Java Introduction to Comparable Comparable is a sort interface. If a class implements the Comparable interface, it means that "this class supports sorting". That is, classes that implement the Comparable interface support sorting. Assuming that there is a "List (or array) o ...

1, Preliminary understanding of java thread 1. java create thread Several ways of creating threads in java Inherit Thread classImplement Runnable interfaceCreate a thread pool using ExecutorServiceImplement the Callable interface to create a thread with a return value Example: //Inherit Thread class public class MyThread extends Thread { ...

catalogue 01 abstract class 1.1 examples of abstract application scenarios 1.2 abstract precautions 1.3 practice of abstract class 1.4 anonymous subclasses of abstract classes 1.5 concrete application of abstraction: template method 1.6 practice of abstract class 01 abstract class With the definition of new subclasses in the inherit ...