best java reference book

There are four types of references in java/android, respectively: Strong reference-strong referenceSoft Reference-Soft referenceWeak Reference-Weak referencePhantom Reference-Virtual reference Different

Original: http://topic.csdn.net/t/20060605/13/4801113.html (Unagain) I recently read a post and asked "is Java passed by value or by reference ?". I thought it was quite simple. To be more accurate, I also looked at langspec3.0 on this issue. I wrote this article at a glance. I am not sure whether my point of view is correct, so I am posting it here and hope you can discuss it together. In addition, it is

Today, when I hit the code, I encountered this problem, the general problem can be simplified as such; public class Test1 {public String get () {return "123"; } public static void Main (string[] args) { string string =get (); } } ShowCannot make a static reference to the Non-static method get () from the type Test1 Well, I decided to change it. public class Test1 {public String get () {return "1

Java Object Reference passing and value passing@author IxenosIn Java.Reference Delivery: In addition to passing arguments to a method (or function) as a "value pass", passing a copy of an object reference is a "reference pass" when assigning a value to a Reference obje

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

the parameter is actually passed into the method function, then how to change its value in the method function, the result is to change only the copy value, not the source value.　　2. What is a referenceWhether Java is a value or a reference, the problem is mainly on the object's delivery, because the simple type in Java does not have a

A detailed description of value passing and reference passing:1: what is passed by valueRefers to when a method call passes a parameter that is passed by a copy of the Value. Examples are as Follows:[java]View PlainCopy Public class Temptest { Private void test1 (int A) { Do Something. } Public static void main (string[] Args) { Temptest t = new Temptest (); int a = 3;

Java provides two different types: The reference type and the original type (or the built-in type ). In addition, Java also provides wrapper for each original type ). If you need an integer variable, do you use the basic int type or an object of the integer class? If a boolean type needs to be declared, is it a basic Boolean or an object using the Boolean class?

According to the book and read the article, leads to a "forward reference" question: Public classInstanceinittest {Static {// {A = 6; System.out.println (a);//cannot reference a field before it is definedSystem.out.println (Fun ()); } Static intFun () {returnA; } Static intA = 9; Public Static voidMain (string[] args) {System.out.println (Newinstanceini

Invocation (call by) is a standard term for computer science. Method invocations are also divided into value calls (call by reference) and reference calls (call by value) , depending on the arguments passed. There are a lot of definitions of these two calls, the most common is that the value of the transfer value is called, the delivery address is a reference c

1, strong reference usually when we program, for example: Object Object=new object (); That object is a strong reference. If an object has a strong reference, it is similar to essential necessities, and the garbage collector will never recycle it. When there is not enough memory space, the Java virtual Machine prefers

Arguments are passed by value instead of by reference. The Java application has only one parameter passing mechanism that is passed by value.Objects are never passed in a Java application, and only object references are passed. Therefore, the object is passed by reference. The fact that

　　Objects are never passed in a Java application, and only object references are passed . Therefore, the object is passed by reference. The fact that Java applications pass objects by reference does not imply that Java applications pass parameters by

First, reference type (except strong reference) A direct subclass of reference can be understood to be customized by the JVM, so it has no effect in the code to inherit directly from the reference type. Only subclasses that inherit from it, and the corresponding subclass types include the following. (ignoring those th

Looking at the public number on Java technology today, I saw a question about the transfer of values in Java, and the article discusses whether it is a value pass or a reference to a question that will be asked when a function is called in Java. have been exposed to similar problems before, but just know is the value o