best java reference book

A few days ago the interview was asked this question, and in the project also encountered similar problems, because did not summarize, resulting in a mess of answers. In the online search information, finally suddenly a lot of situation.When an object is passed as a parameter to a method, this method can change the properties of the object and return the changed result, is it a value pass or a reference pass?A: The value is passed. The

{String name;Private Folat Price;Book (StringN, float) {//constructor methodname = N;Price =P}static void Change (book A_book, String N, floatp) {//static method, object as parameterA_book.name = n;A_book.price= P;}public voidOutput () {//instance method, outputs object informationSystem.out.println ("Name:" + name +"\ T" + "Price:" + price);}}public classpassaddr{public static void Main (String [] args) {

result is retained after the call is completed.Class book {String name;Private folat price;Book (string N, float) {// ConstructorName = N;Price = P;}Static void change (Book a_book, string N, float p) {// static method, with the object as the parameterA_book.name = N;A_book.price = P;}Public void output () {// instance method, which outputs Object InformationSys

Java programs have a strong ability to migrate. The following table lists the simple types defined in Java, the number of bits, and the corresponding wrapper classes. Simple Type boolean Char byte Short Int Long float Double void bits 1 all 8 + + 32

I believe that for many beginners Java this part of the content is not easy to understand, recently read some Java video, a little harvest, intends to summarize. Java makes it clear that pointers are canceled, because pointers are often more convenient and cause code insecurity, and make programs very complex and difficult to understand.

Java GC and ghost referenceThere are four types of references in Java: strongreference, softreference, weakreference, and phantomreference ),These four types of references are closely related to GC. Let's look at their definitions and use cases one by one: 1. Strong referenceStrongreference is the default reference implementation of

Java objects and their referencesSome basic concepts between objects and references.Beginner Java, for a long time, always feel that the basic concept is very vague. Later, in many Java books, the references to objects and objects are confused. However, if I can't tell the object from the object reference, That's reall

Java objects and their referencesSome basic concepts between objects and references.Beginner Java, for a long time, always feel that the basic concept is very vague. Later, in many Java books, the references to objects and objects are confused. However, if I can't tell the object from the object reference,That's really

Idle to Nothing, with Java's soft reference to write a cottage cacheBlog Category: Java Basics It is well known that references in Java are divided into Strongreference, SoftReference, WeakReference, Phantomreference. These kinds of references have different uses of the scene, usually we use the most frequent is the strongreference, that is to say t

I. Construction method: When a class is instantiated, the first thing to do when it is new is the constructor, in the Java class, if the declaration constructor is not displayed, the JVM gives the class a default constructor. A class can have more than one constructor. The main function of a constructor is to instantiate the class. The second is what to do when the class is instantiated, and which properties to initialize. When a class declares a cons

It is important to believe that this is a problem for many beginners of Java, because unlike C,c++,java it is clear that pointers are removed because pointers tend to be more convenient and cause code insecurity, and make programs very complex and difficult to understand. Java Discard pointers simply do not have a clear pointer definition in the

It is always a topic to talk about whether a reference pass or value is passed on a Java parameter.There is a forum that there is only value in Java, there are some places that reference passing and value delivery are present, it is easier to confuse people.About value passing and