什么是自定义jvm属性？ [英] what are custom jvm properties?

问题描述

我是Java的新手，我遇到了自定义JVM属性一节，以及如何在eclipse中运行具有自定义JVM属性的配置。我想了解它是什么，它可以如何帮助我作为程序员。

解决方案

jvm properties创建一个属性（名称/值对）JVM的方式。一旦你将一个属性传递给jvm，它就可以在jvm的每一个点被访问。

如何将属性传递给jvm ：

您可以通过命令行（ -Dproperty_name1 = property_value1 -Dproperty_name2 = property_value2 ... ）在jvm传递属性启动，

或

通过调用运行的jvm System.getProperties（） 。$（$）



通过调用 System.setProperty（property_name1，property_value1）运行jvm

该属性：

无论哪种方式，这些属性变为JVM宽，您可以通过调用System.getProperty（property_name1）在应用程序的每一个点达到他们）...

这个docement 可以帮助你理解属性概念和用法。

示例：

  package so; 
 public class SomeClass {
 public void someMethod（）{
 System.setProperty（my_pet_name，boomerang）; 
} 
} 
  

调用 someMethod（） 在您的应用程序中的任何一点，然后您可以在任何其他类中阅读它：

 包装好
 public class SomeOtherClass {
 public void someOtherMethod（）{
 String myPetName = System.getProperty（my_pet_name）; 
 System.out.println（myPetName）; 
} 
} 
  

I am new to Java and I have come across the term "custom JVM properties" and how to run configurations with custom JVM properties in eclipse. I want to understand what it really is and how it can help me as a programmer.

解决方案

"jvm properties" concept is a way of making a property (name/value pair) JVM wide. Once you pass a property to the jvm, it becomes accesible in every point of that jvm.

how to pass a property to a jvm:

you can pass properties by command line (-Dproperty_name1=property_value1 -Dproperty_name2=property_value2 ...) at jvm startup,

or

in a running jvm by calling System.getProperties().load(inputStream) from a property file.

or

in a running jvm by calling System.setProperty("property_name1", "property_value1")

how to reach that property:

either way, these properties become JVM wide and you can reach them in every point of your application by calling System.getProperty("property_name1") ...

this docement may help you understanding the properties concept and usage.

example:

package so;
public class SomeClass {
    public void someMethod() {
        System.setProperty("my_pet_name", "boomerang");
    }
}

after calling someMethod() at any point in your application, then you can read it in any other class like this:

package so;
public class SomeOtherClass {
    public void someOtherMethod() {
        String myPetName = System.getProperty("my_pet_name");
        System.out.println(myPetName);
    }
}

这篇关于什么是自定义jvm属性？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！