Command line Java on DalvikVM

dalvik.sh

#!/bin/sh
DIR="tmp_"$$
JAR=`echo $1 | tr '.' ' ' | awk '{ print $1 }'`
rm -rf $JAR.jar
mkdir $DIR
cp $1 $DIR
cd $DIR
echo "** Compiling java file..."
javac -d . -g $1
echo "** Creating temporary jar..."
jar -cvf Temp.jar *
echo "** Creating DEX file..."
dx --dex --output=./classes.dex Temp.jar
echo "** Creating Android compatible file..."
aapt add ../$JAR.jar classes.dex
cd ..
rm -rf $DIR
echo "** Finished!"
echo ""
echo "Now copy to your device, ex:"
echo ""
echo "    adb push "$JAR".jar /data/local"
echo ""
echo "adb shell"
PACKAGE_NAME=`grep "package" $1 |awk '{print $2}' | tr ';' '.'`
CLASS_NAME=`grep -i "public class" $1 | awk '{ print $3 }'`
echo "/system/bin/dalvikvm -Xbootclasspath:/system/framework/core.jar -classpath /data/local/"$JAR".jar "$PACKAGE_NAME$CLASS_NAME

Usage (chmod +x dalvik.sh):
./dalvik.sh HelloWorld.java

// Example code
package br.com.coding;

public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}