immutable class in java

P1 are die, if the P1 object dies, then P2 will notHome, this is really unfair to P2, and if you create a home object for P1 and P2, you waste resources. So in this case,It is appropriate to use static internal analogies for ordinary internal classes.the difference between a static inner class and a normal inner class(1) Ordinary inner classes cannot declare static methods and variablesOrdinary inner class

The Inner class(inner Class) defines the classes in the class. (generally Java's argument)The Nested class(nested Class) is a static (static) inner class. (generally C + + parlance)Static inner

Interfaces can inherit Interfaces. Abstract classes can implement (implements) interfaces, and abstract classes can inherit concrete Classes. There can be static main methods in an abstract class.Q: Does an abstract class inherit entity classes (concrete Class)A: An abstract class can inherit an entity class, but only

Reprinted from: http://chenzhou123520.iteye.com/blog/1597597The Java Virtual Machine specification does not have a mandatory constraint on when to start the class loading process, but for the initialization phase, the virtual machine specification strictly stipulates that there are only four cases where the class must be "initialized" (while the load, validate, p

1. A Java program is a collection of classes.A class in a program has two kinds of arrangement structures. For example: classenclosingclass{..... Class anestedclass{......} } 2. In some special cases, a class is also placed within the internal definition of another class,

Java-> Class Object, java-> class In Java, we often see a type: Class. It can also be seen in Code such as Person. class and cache. getClass. As we all know,

JAVA interface and abstract class, JAVA interface abstract class For object-oriented programming, abstraction is one of its major features. In Java, OOP abstraction can be embodied in two forms: interfaces and abstract classes. I. abstract

A String class Strings are widely used in Java programming, where strings belong to objects, and Java provides a string class to create and manipulate strings. In the program OpenStrings are everywhere in the hair, such as the user name, password, etc. that are used when the user logs in. In fact, in the previous chapt

In the interview often encountered such a problem: 1, what is immutable object. What are the benefits of immutable objects. In what scenarios to use it, or more specifically, why should the Java String class be set to immutable types?1,