How to invoke the .bat(batch file ) from the java program

i want to run some commands when i run one java program.
I wrote those dos commands on the batch file and i want to include the bat file in the java program so that i can execute the bat file when i run the java program.
tell me the way that i can run my bat file inside the java program.

i tried this :
a .bat file named test.bat, with this code : copy test.bat test2.bat
a java class, Test.class, in the same directory
public class Test {
     public static void main(String[] args) {
          try {
               Runtime rt = Runtime.getRuntime();
               Process proc = rt.exec("cmd /c test.bat");
               proc.waitFor();
               int exitVal = proc.exitValue();
               System.out.println("Process exitValue: " + exitVal);
          catch (Throwable t) {
               t.printStackTrace();
}

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