Program: How to get all keys from properties file?

This example shows how to get all keys from the given properties file. All keys will be returned in the form of set object. You can get it by calling keySet() method.

package com.java2novice.properties;

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

public class MyPropAllKeys {

	private Properties prop = null;
	
	public MyPropAllKeys(){
		
		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 Set<Object> getAllKeys(){
		Set<Object> keys = prop.keySet();
		return keys;
	}
	
	public String getPropertyValue(String key){
		return this.prop.getProperty(key);
	}
	
	public static void main(String a[]){
		
		MyPropAllKeys mpc = new MyPropAllKeys();
		Set<Object> keys = mpc.getAllKeys();
		for(Object k:keys){
			String key = (String)k;
			System.out.println(key+": "+mpc.getPropertyValue(key));
		}
	}
}

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

db.password: mypassword
db.user: java2novice
db.host: appdomain.java2novice.com
db.service: orcl