best java reference book

The day before yesterday when the system was in the Java parameter Transfer problem card, looking back to the relevant information, the parameter transfer problem has a new understanding and mastery, but there is a problem is still very vague, is Java in the end whether there is only value transmission, because in the data access, Often see some people say Java o

This topic has always been a hot topic for Java programmers, arguing constantly, but whether you search the Baidu or to see the official documents indicated in the same, get only one conclusion:Java only value is passed .Here is no code to explain carefully, let's take a look at some of the arguments:1."Java is always value-passed . Unfortunately, they (Sun) decided to call ' an object's address ' as '

, which can be understood as an abstract expression for memory. With each language, there will be data types of understanding, there are complex, simple, all kinds of data types need to understand at the beginning of learning, Java is a strongly typed language, so Java for Data type specification will be relatively strict. The data type is the abstract atomic concept of language, which can be said to be the

, which can be understood as an abstract expression for memory. With each language, there will be data types of understanding, there are complex, simple, all kinds of data types need to understand at the beginning of learning, Java is a strongly typed language, so Java for Data type specification will be relatively strict. The data type is the abstract atomic concept of language, which can be said to be the

to a human object, called an object reference (Reference). In fact, Aperson is not the object itself, but rather a pointer to an object. The Aperson exists in the stack of memory (stack). When we assign a value with an equal sign, it is given to the object reference by the address of the right-hand new object created in the heap. The memory here refers

In a recent study of Java cache implementations, it was found that soft references (softreference) were not understood, and the JDK documentation, code, and several articles were consulted. Make a summary, if there is a mistake, please correct me.There are two reasons why you want to learn about several types of references in Java: Understand the relationship between

Java basics 11 Object ReferenceWe have been using the concept of "object" before, but we have not explored the specific storage method of objects in memory. This discussion will introduce the important concept of "object reference. Object Reference We use the previously defined Human class and have a Test class: public class Test{ public static void main(Stri

This page was updated on July 17, 2016Object/reference In the preceding Persontest.java code, there is a line of code: Person p = new person ();This line of code creates a person instance, also known as the Person object, which is assigned to the P variable. This line of code actually produces two things: one is the P variable, and the other is the person object. From the person class definition, the person object should contain two i

Link: https://www.jianshu.com/p/882d0e2c3ea6: Jane book full-time Atomicreference An object reference the May updated atomically. AtomicReferenceThe class provides reference objects. May is read and written atomically, so if multiple threads try to reach them at the same time, only one would be able to doing so.Provides a read-write atomic operation

there is a way to cache the data as much as possible to improve operational efficiency, but also can actively empty a portion of expired data before the GC to prevent memory overflow, how good. Below, I want to talk about the implementation of heap memory monitoring based on Java soft Reference, which is the author's practice in the production system, may help the programmer to do some experiments in this

change the value in the method function, the result only changes the copied value, not the source value. 　　2. What is reference In Java, whether to pass values or references is mainly due to the transfer of objects because simple types in Java are not referenced. Since the argument mentions the reference, we must know

target object based on the memory situation, and the Client needs to handle it itself to prevent the Heap out of memory exception.A virtual reference has the following characteristics:A virtual reference can never use the Get () method to obtain a strong reference to an object to access the target object.The virtual referenc