Java class which builds various versions of the same project by modifying a settings file accordingly

compile.java

class Compile {
    private static Runtime rt = Runtime.getRuntime();
    private static final String version = "1.4.2";
    public static void main(String[] args) throws IOException{
        modify(false,false,true);
        build();dist("Full");
        
        modify(false,true,true);
        build();dist("Trial");
    }
    public static void modify(boolean asis, boolean trial, boolean traffic){
        try {
            BufferedReader br = new BufferedReader(new FileReader("src/settings.java"));
            BufferedWriter bw = new BufferedWriter(new FileWriter("src/settings2.java"));
            String line;
            while ((line = br.readLine()) != null){
                if (line.contains("public static final boolean ASIS"))
                    bw.write("    public static final boolean ASIS = "+(asis?"true":"false")+";\n");
                else if (line.contains("public static final boolean trialVersion"))
                    bw.write("    public static final boolean trialVersion = "+(trial?"true":"false")+";\n");
                else if (line.contains("public static final boolean trafficLights"))
                    bw.write("    public static final boolean trafficLights = "+(traffic?"true":"false")+";\n");
                else
                    bw.write(line+"\n");
            }
            br.close();
            bw.flush();bw.close();
            File old = new File("src/settings.java");
            File ne = new File("src/settings2.java");
            ne.deleteOnExit();
            old.delete();
            ne.renameTo(new File("src/settings.java"));
        } catch (Exception e) {
            System.err.println("Error reading file: "+e);
        }
    }
    public static void build(){
        File f = new File("dist/SPEKS.jar");
        f.delete();
        try{
            Process proc = rt.exec("ant -f D:\\Documents\\NetBeansProjects\\SPEKS clean jar");
            BufferedReader stdInput = new BufferedReader(new InputStreamReader(proc.getInputStream()));
            BufferedReader stdError = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
            String s;
            while ((s = stdInput.readLine()) != null)
                System.out.println(s);
            while ((s = stdError.readLine()) != null)
                System.err.println(s);
        }catch (Exception e){}
    }
    public static void dist(String name){
        File build = new File("dist/SPEKs.jar");
        build.renameTo(new File("bin/SPEKS["+version+"]_"+name+".jar"));
        System.out.println(name+" done!");
    }
}