File operations in Java Read file, write into file, Append file

File operations involved majorly are reading it , writing into a file and appending it.

try {
    BufferedReader in = new BufferedReader(new FileReader("infilename"));
    String str;
    while ((str = in.readLine()) != null) {
        process(str);
    }
    in.close();
} catch (IOException e) {
}

Writing into a File : 

try {
    BufferedWriter out = new BufferedWriter(new FileWriter("outfilename"));
    out.write("aString");
    out.close();
} catch (IOException e) {
}

Appending to a File : 

try {
    BufferedWriter out = new BufferedWriter(new FileWriter("filename", true));
    out.write("aString");
    out.close();
} catch (IOException e) {
}

public static void main(String[] args) throws InterruptedException,
            IOException {
        System.out.println("Starting ");
Runtime runtime = Runtime.getRuntime();
            String[] command = { "cmd.exe", "/C", "start /WAIT",
                    "C:\\Users\\IBM_ADMIN\\Desktop\\BVT31\\BVT31\\xFAST.bat",
                    "--cf", "IE_Configurations.properties", "--tc",
                    "scripts\\testCases" };
            Process p = runtime
                    .exec(command, null, new File(tipBVTScriptsPath));
            p.waitFor();
            System.out.println(p.exitValue());
}