Running and closing application for each monkey talk test method

From couple of days I was looking that each monkeyTalk automation script would run individually without affecting each other, It means that AUT (Application Under Test) at initial stage for each test. 
So I think that if I launch application before running test and closing after test execution, I will get solution.

After searching, I got some adb commands to launch and close installed application. Below commands are for the same:
To launch Application:

adb shell am start -n com.gorillalogic.monkeytalk.demo1/.RootActivity

Where “com.gorillalogic.monkeytalk.demo1” is application package name and “RootActivity” is main activity class name.
To close application

adb shell am force-stop com.gorillalogic.monkeytalk.demo1

Where “com.gorillalogic.monkeytalk.demo1” is application package name.

We can execute above adb command using java code by using “Runtime.getRuntime().exec()” method.
Below example is junit test script having two methods with implemented launching and closing application approach.

package com.test;

import java.io.File;
import java.io.IOException;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import com.gorillalogic.monkeytalk.java.MonkeyTalkDriver;
import com.gorillalogic.monkeytalk.java.api.Application;

public class SampleTest {
    private static MonkeyTalkDriver mt;
    private Application app;

    @BeforeClass
    public static void beforeClass() throws IOException {   
        mt = new MonkeyTalkDriver(new File("."), "Android");
        mt.setThinktime(500);
        mt.setTimeout(5000);         
    }

    @Before
    public void testBefore() throws IOException, InterruptedException{
        Runtime.getRuntime().exec("adb shell am start -n com.gorillalogic.monkeytalk.demo1/.RootActivity");
        Thread.sleep(10000);
    }

    @After
    public void closeApp() throws IOException{
        Runtime.getRuntime().exec("adb shell am force-stop com.gorillalogic.monkeytalk.demo1");
    }

    @Test
    public void testLogin() throws InterruptedException {
        app = mt.app();
        app.tabBar().select("login");
        app.input("username").enterText("Admin");
        app.input("password").enterText("Admin");
        app.button("LOGIN").tap();
        Thread.sleep(4000);
        app.button("LOGOUT").tap();        
    }


    @Test
    public void testForms() throws InterruptedException {
        app = mt.app();       
        app.tabBar().select("forms");
        app.itemSelector("myDropdown").select("Hydrogen");
        app.itemSelector("myDropdown").select("Lithium");
        app.checkBox("mySwitch").off();
        app.buttonSelector("myRadios").select("B");              
    }
}