java command not 双语版Java程序设计

java command not 双语版Java程序设计

2.3 Write the First Java

A class has been as a . It can be used as a for new that add . are units of a class. that can new of a class to be on an “as ” basis. the of code that time.

对象是类的具体实现。动态加载意味着应用程序能够在需要的时候请求一个特殊类的实例。

A Java in most . Code in on the user’s and is by a run-time that has to be user .

You wrote a ‘hello world!’ to test the . Now comes the of the basic of Java using it as an . are stand-alone and are (or ) by using a Java .

/**
 * The HelloWorldApp 类实现一个应用
 * 显示"Hello World!".
 */
public class HelloWorldApp {
   public static void main(String[] args) {
            System.out.println("Hello World!");
   }
}

The first four lines is a on the ’s . are not but are as the . Other notes and doc files may get lost but these stay right where they are most . A long with a /* or /** and ends with a */ .Short one line begin with // and end with the .

The fifth line with the word . This that the can (or use) it. The word class that we are a new with the name that . is the name (your ) and is case . Java ‘style’is to the first of each word only. The line with an curly that marks the start of the .

注释对于理解代码有很重要的作用，有单行注释和多行注释。修饰符表示其他对象可以调用该程序。是一个类名字java command notjava command notjava command not 双语版Java程序设计，而该类的类体包含在花括号内。

Line six is an of an (or in older ). that it calls the class and not an ‘’ of the class. The of ‘’ will be later in the . The ’s name is main and the word void that no is back. Main has (aka ) in round . the type is an array and args is a word that it is the line that are being over to main. The line with an for the main .

main函数是该程序的主函数java command not 双语版Java程序设计，也是程序执行的入口点。main函数没有返回类型，但是具有一个参数数组java command not，该数组可以接收来自控制台的输入参数。

Line eight the of the .out . What is to be is in the as a . Note that each Java with a .

curly are used for the main and for the .