What is the language used in the most mobile applications? java, c++,etc?

Mainly JAVA

android -  java

The Decision of Which Programming language -- > depend on NEEDS of clientss 

- Android OS will use JAVA Programming Lang

- IOS OS will use Objective C

- BlackBerry Can Use Java For Development

Also There are some Technology use HTML5 and Java Script to create cross platform mobile applications like PhoneGap and Touch Programming

Java

Java

it depends what platform we speak there are4 major platform:

Android-based Java (Java Development Kit · The Android SDK)

iOS: Objective C

BlackBerry: java using R.I.M

Windows Phone: Charp / silverlight

if you already have a website you want to convert to mobile then go with HTML/JS/CSS (much faster and guarenteed option).

Otherwsie, pick either .NET for any Microsoft mobile device and Java for others.

I think Java for Android, Objective C for iOS, C for other Embedded devices.

JAVA.

Android based applications are built on top of Java, right now Android has great share in market, & iphone apps are built on Objective C, you can say it is an extension to C but Object Oriented.

java