JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to load Properties file from a static block or static method?


Description:

This example shows how to load properties file with in a static block or static method. Here we are using ClassLoader.class.getResourceAsStream() to load the properties file in the classpath within static block. Make sure that the class is available in the class path


Code:
package com.java2novice.properties;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class MyPropInStaticBlock {

	private static Properties prop;
	
	static{
		InputStream is = null;
		try {
			prop = new Properties();
			is = ClassLoader.class.getResourceAsStream("/sample.properties");
			prop.load(is);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public static String getPropertyValue(String key){
		return prop.getProperty(key);
	}
	
	public static void main(String a[]){
		
		System.out.println("db.host: "+getPropertyValue("db.host"));
		System.out.println("db.user: "+getPropertyValue("db.user"));
		System.out.println("db.password: "+getPropertyValue("db.password"));
	}
}

sample.properties
db.host=appdomain.java2novice.com
db.user=java2novice
db.password=mypassword
db.service=orcl

Output:
db.host: appdomain.java2novice.com
db.user: java2novice
db.password: mypassword
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List of Properties class sample programs:

  1. How to load Properties file from a file system?
  2. How to load Properties file from the classpath?
  3. How to load Properties file from a static block or static method?
  4. How to assign default values for unavailable keys in properties file?
  5. How to get all keys from properties file?
  6. How to create and store property file dynamically?
  7. How to store property file as xml file?
  8. How to load property file using class name in java?
Knowledge Centre
String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
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The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
-- Daniel J. Boorstin

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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