what is api in java

Click to enter _ more _java thousand questions What is the difference between a local variable, a class variable, and an instance variable Before we talk about the difference between local variables, class variables, and instance variables, we need to look at Java variables. 1, what

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Class classes are implementations that define a particular class in the Java language. The definition of a class contains the member variables, the member methods, the interfaces that the class implements, and the parent class of the class. The object of the class class is used to represent classes and interfaces in the currently running Java application. For exa

object, the object is called the Unreachable object (the surviving object, the object cannot be reclaimed). Otherwise, the unreachable object can be recycled. 2, how to clean up the new generation of garbage Garbage Cleanup Algorithm The new generation of garbage collectors often assume that most objects have a very short survival time, with only a few objects surviving longer. According to this assumption, the new generation of garbage removal algor

From: http://blog.csdn.net/hlf48641715/archive/2008/12/25/3605789.aspx Several Java objects (PO, Vo, Dao, Bo, pojo)I. Po: persistence object of persistant object. It can be regarded as a Java object mapped to a table in the database. The simplest Po is to correspond to a record in a table in the database. A set of PO can be used for multiple records. The PO shou

(Exception e) {System.out.println (E.getmessage)) finally{SYSTEM.OUT.PRINTLN ("finally Running");//No matter what happens to the program, finally code blocks are executed.} SYSTEM.OUT.PRINTLN ("program running Here");}}1. The program is matched according to the type of exception. Automatically enter the appropriate catch statement. Exception should be placed after other exception statements, because they

I am a beginner in PHP. I have bought a java manual and haven't started to read it yet. This statement has made me very excited. I really want to know the specific situation. I am a beginner in PHP. I have bought a java manual and haven't started to read it yet. This statement has made me very excited. I really want to know the specific situation. Reply: "Father, forgive them for they don't know

Java programming 2-What is program design? Author: Chen yuefeng from: http://blog.csdn.net/mailbomb programming, commonly known as programming, is a professional concept. Beginners and even some developers cannot simply explain this concept. Therefore, it makes beginners feel that programming

Click to enter _ more _java FAQ-base Class Library1, util package has what functionThe Java.util package provides the underlying tools classes in Java. Includes base classes such as the basic Set framework and common tool classes. Main classes such as:?The Java.util package is broadly divided into two categories: collections, tools, and the following are some of

What is a byte code?Bytecode can also be said to be a language, or an operational primitive that communicates with the operating system. The purpose of bytecode is actually to shield operating system differences, operating system differences to the professional virtual machine developers, they want to ensure that their development of virtual machines compatible w

Brief The previous chapter briefly describes what a collection is and what kinds of collections there are.In this chapter we mainly introduce one of the implementation of collection, List.What is List In the previous chapter, we have learned that list is divided into 3 cate

Personal understanding: The definition of interface variables for the receiving type is interface-oriented programming, through the abstraction of the interface can reduce the coupling between classes, increase reusability.Interface-Oriented Programming:A normative constraint The creator (or coordinator), the creator (or producer), the caller (or the consumer). An interface is essentially a set

, the ticket will appear negativeThere is also a synchronization methodThe format is as follows:Synchronized method return type method name (parameter list) {}5, the life cycle of the thread/1) Create status2) Ready state3) Operating Status4) Blocking status5) Termination Status6, Add JS UnderstandingLook at a piece of code firstvar x = Document.getelementsbyname (data); var i; for (i = 0; i var value=x[i]

Click to enter _ more _java thousand ask1, >, >>, >>> what is the differenceSee Java operators here: What are the operators of JavaUnderstanding Java Operator Precedence See here: What is