Class to call external programs in Java and return the output String.

ProgramCaller.java

package util;

import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * Created by dan on 2/4/14.
 */
public class ProgramCaller {

    private String program;

    public ProgramCaller(String pname){
          program = pname;
    }

    public ProgramCaller(){
        program = "";
    }

    private String execute(String command){
        StringBuffer output = new StringBuffer();

        Process p;
        try {
            p = Runtime.getRuntime().exec(command);
            p.waitFor();
            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(p.getInputStream()));

            String line = "";
            while ((line = reader.readLine())!= null) {
                output.append(line + "\n");
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return output.toString();
    }

    public String runProgram(){
        return execute(program);
    }

    public String runProgram(String pname){
        return execute(pname);
    }
}