Source command not working through Java

From last day, I have been trying to execute a command on Terminal (MAC) using JAVA but whatever I do nothing is working.

I have the following 2 commands that I want to execute and get the output back in JAVA

source activate abc_env
python example.py

Till now, I have tried the following methods without any output

String[] command = new String[] { "source activate abc_env", "python example.py"};
String result = executeCommands(command);

Here is my executeCommands method

private static String executeCommands(String[] command) {

        StringBuffer output = new StringBuffer();

        Process p;
        try {
            for(int i=0; i< command.length;i++)
            {
                p = Runtime.getRuntime().exec(command[i]);
                p.waitFor();
                BufferedReader reader = 
                                new BufferedReader(new InputStreamReader(p.getInputStream()));

                String line = "";           
                while ((line = reader.readLine())!= null) {
                    output.append(line + "\n");
                }
                System.out.println("Error output: " + p.exitValue());
                System.out.println("Output:" + output);

            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("Here");
        }
        return output.toString();
    }

This gives me the following exception

Cannot run program "source": error=2, No such file or directory

I searched online and people say that source won't work like this and I should change the command to

String[] command = new String[] { "bash -c 'source activate abc_env'", "python example.py"};

Now, I donot get the exception but the command still does not work and it returns '2' as exitValue()

Then I tried to execute the commands as a script

#!/bin/bash
source activate abc_env
python example.py

I get the following exception when I read the .sh file as string and pass it to command

Cannot run program "#!/bin/bash": error=2, No such file or directory

So, my question is how to run the source command followed by python command properly through Java ? My final goal is execute some python from Java.

EDIT1: If I try the following command and print the output stream

String[] command = {
                "/bin/bash",
                "-c",
                "source activate cvxpy_env"
        };

executeCommand(command));

Output Stream:

ExitValue:1

ErrorOutput:/bin/bash: activate: No such file or directory

If I try the same command but with single quotes around 'source activate abc_env'. I get the following output

ExitValue:127

ErrorOutput:/bin/bash: source activate cvxpy_env: command not found

Solution:

String[] command = {
                "/bin/bash",
                "-c",
                "source /Users/pc_name/my_python_library/bin/activate abc_env;python example.py"
        };