java强制变量声明语句_Java中声明语句的定义

た入场券 2022-12-06 15:45 283阅读 0赞

java强制变量声明语句

One kind of Java [statement][] is a declaration statement, which is used to [declare a variable][] by specifying its data type and name. Below are some examples of declaration statements.

一种Java [语句][statement]是声明语句，它用于通过指定[变量][declare a variable]的数据类型和名称来[声明变量][declare a variable] 。 以下是声明语句的一些示例。

A [variable][], in relation to [Java][] programming, is a container that holds values used in a Java program. Instead of defining a value over and over, a variable that has a value attached to it can be defined. Since variables must be given an initial starting value, you can see how that works in the examples on this page.

与[Java][]编程相关的[变量][variable]是一个容器，其中包含Java程序中使用的值。 可以不用定义一遍又一遍的值，而可以定义一个附加了值的变量。 由于必须给变量一个初始起始值，因此您可以在此页面的示例中看到它的工作方式。

## Java声明示例 **(** Examples of Declarations in Java **)** ##

The following three declaration statements declare [int][], [boolean][] and *String* variables:

以下三个声明语句声明[int][] ， [boolean][]和*String*变量：

int number;

**boolean isFinished;**  **boolean isFinished;**  **String welcomeMessage;**  **字符串welcomeMessage;**

In addition to the data type and name, a declaration statement can initialize the variable with a value:

除数据类型和名称外，声明语句还可以使用以下值初始化变量：

int number = 10;

**boolean isFinished = false;**  **boolean isFinished = false;**  **String welcomeMessage = "Hello!";**  **字符串welcomeMessage =“ Hello！”;**

It's also possible to declare more than one variable of the same data type in one declaration statement:

还可以在一个声明语句中声明多个相同数据类型的变量：

int number, anotherNumber, yetAnotherNumber;

**boolean isFinished = false, isAlmostFinished = true;**  **boolean isFinished = false，isAlmostFinished = true;**  **String welcomeMessage = "Hello!", farewellMessage;** **字符串welcomeMessage =“ Hello！”，farewellMessage;**

The variables *number*, *anotherNumber,* and *yetAnotherNumber* all have int data types. The two boolean variables *isFinished* and *isAlmostFinished* are declared with initial values of false and true respectively. Finally, the String variable *welcomeMessage* is assigned the String value of "Hello!", while the variable *farewellMessage* is simply declared as a String.

变量*number* ， *anotherNumber*和*yetAnotherNumber*都具有int数据类型。 两个布尔变量*isFinished*和*isAlmostFinished*分别声明为false和true的初始值。 最后，为String变量*welcomeMessage*分配了字符串值“ Hello！”，而将*farewellMessage*变量简单声明为String。

There are also control flow statements in Java as well as [expression statements][].

Java中还有控制流语句以及[表达式语句][expression statements] 。

> 翻译自: [https://www.thoughtco.com/declaration-statement-2034076][https_www.thoughtco.com_declaration-statement-2034076]

java强制变量声明语句

[statement]: https://www.thoughtco.com/statement-2034294
[declare a variable]: https://www.thoughtco.com/declaring-variables-2034319
[variable]: https://www.thoughtco.com/variable-2034325
[Java]: https://www.thoughtco.com/what-is-java-2034117
[int]: https://www.thoughtco.com/definition-of-int-958297
[boolean]: https://www.thoughtco.com/definition-of-bool-958287
[expression statements]: https://www.thoughtco.com/expression-2034097
[https_www.thoughtco.com_declaration-statement-2034076]: https://www.thoughtco.com/declaration-statement-2034076