Java

From my suggestion if u have time then u can read java and advanced java online.There are many tutorials available in youtube and u can study from there .The fee structure of both near about 5-8 thousands.

Firstly, learn the basics of Java from any online source. It will not take much time. This is the first step for being an android developer. Then learn android step by step. Learn what are layouts, then activity. These are the basic blocks. Later on, you'll just have to explore different features.

Hi Paikndla,
I recommend you to download ISTQB e-book from
http://www.computing.dcu.ie/~ray/teaching/CA358/dorothy_graham.pdf to attain foundation level knowledge of testing.
You can get good knowledge of Java on Javapoint.com and tutorialspoint.com. I encourage you to test your skills on online crowdsourcing platform like topcoder.com.
Should you have any query, feel free to extend the thread.
Thanks.

You may go for HP or NIIT.

You can apply for Java certification online through Oracle. Oracle gives you complete assistance to apply online. You can also contact institutes, like NIIT or TATA CMC , which helps students to get through certification programs. Applying through these institutes help you in getting questions dump which are very helpful in preparations. Also these institutes conduct mock tests which proves boosting factor for preparation.
All the best.

Between all three mentioned, I'll advice to go for Java. Among these java captures major market share. Due to its open source attribute most companies invest in Java for their application development. Also java has some unique features which keeps it at upper hand over other two. But yes going towards learning curve, Java requires more time to get proficiency. But in end you will enjoy upper hand after learning Java.
Best of Luck.!!

To get tutorials for Java you can visit tutorialspoint.com . Its good site to start with. But strongly recommend to join some code practice platform like techgig.com or hackerank. They will provide sample problems to solve along with learning.
Lastly, don't forget to refer java docs from oracle's official website for the specific version of java you are learning.
HAPPY LEARNING. KEEP PRACTICING.

Every technology has great oppurtunity if you have sufficient knowledge about it. After CCNA and having good knowledge you have chance to work in companies like CISCO.
Java itself has very high usage rate.
.net also has high usage as many websites and softwares uses .net.
So every technology has oppurtunity, you just need to go wid your interest and with full dedication

Hi Divya,
After completing core java , you can opt for advance java course or can go for other java certifications like SCJD, SCJA, JDE, Share point etc. The other option is to join an IT company in a java module because that will you give a real time experience to work on java.
All the best