ProcessBuilder类的environment()方法 (ProcessBuilder Class environment() method)

• environment() method is available in java.lang package.

  environment()方法在java.lang包中可用。

• environment() method is used to return Map interfaces of this process builder environment.

  environment()方法用于返回此流程构建器环境的Map接口。

• environment() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  environment()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• environment() method may throw an exception at the time of returning map interfaces.

  返回映射接口时， environment()方法可能会引发异常。

  SecurityException: This exception may throw when the calling thread does not have the right to access the process builder environment when the security manager exists.

  SecurityException ：如果存在安全管理器时调用线程无权访问流程构建器环境，则可能引发此异常。

Syntax:

句法：

    public Map environment();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is Map, it returns this process builder environment.

该方法的返回类型为Map ，它返回此流程构建器环境。

Example:

例：

// Java program to demonstrate the example
// of Map environment() method of ProcessBuilder
import java.io.*;
import java.util.*;
public class Environment {public static void main(String[] args) throws Exception {// Instantiating ProcessBuilder object
ProcessBuilder pr_bu = new ProcessBuilder();
// By using environment() method is to retrieve the
// environment of this pr_bu object
Map m = pr_bu.environment();
// Display the environment variable value
System.out.println(m.get("PATH"));
}
}

Output

输出量

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/isCOBOL2019R1/bin:/opt/cs/artifacts/Release/bin

翻译自: https://www.includehelp.com/java/processbuilder-environment-method-with-example.aspx