JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to assign default values for unavailable keys in properties file?


Description:

The Properties class also provide a method, incase if the key is not available in the properties file, then you can specify the default value. Below example give sample code for this.


Code:
package com.java2novice.properties;

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

public class MyPropDefaultValue {

private Properties prop = null;
	
	public MyPropDefaultValue(){
		
		InputStream is = null;
		try {
			this.prop = new Properties();
			is = this.getClass().getResourceAsStream("/sample.properties");
			prop.load(is);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public String getPropertyValue(String key){
		return this.prop.getProperty(key, "Its Default Value");
	}
	
	public static void main(String a[]){
		
		MyPropDefaultValue mpc = new MyPropDefaultValue();
		System.out.println("db.host: "+mpc.getPropertyValue("db.tables"));
		System.out.println("db.user: "+mpc.getPropertyValue("db.user"));
	}
}

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

Output:
db.host: Its Default Value
db.user: java2novice
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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?
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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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