What is the setProperties() method in Java?

Overview

In Java, setProperties() is a static method used to set the argument instance of the Properties class to current system properties. It is the opposite of getProperties() method.

Note: java.util.Properties is a subclass of HashTable class containing key and value pairs of string type.

Syntax

static void setProperties(Properties properties)

Parameters

setProperties() takes the parameter, properties, which represents the instance of Properties class.

Return Value

It is a void method. it does not return any value.

Example

import java.lang.*;

import java.util.Properties;

// Edpresso class to test this method

public class Edpresso {

   public static void main(String[] args) {

      // Extracting current properties 

      Properties property = System.getProperties();

      // Putting value and key of this property

      property.put("java.runtime.version", "Java Runtime v8.1.0");

      // Calling setProperties() method to set

      // current system thread properties

      System.setProperties(property);

      // Getting property after "java runtime version" as value

      System.out.println(System.getProperty("java.runtime.version"));

   }

}

Explanation

  • Line 7: We call the getProperties() method to extract current system thread’s properties type instance.

Click here to learn more about getProperties() function and how it works.

  • Line 9: We change the java runtime version to java 8.1.0.
  • Line 12: We invoke the setProperties() method to set the current system thread’s properties.
  • Line 14: We print the running system thread’s properties to the console.

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