public class Foo
{

public static void main(String[] args)
	{
		File f = new File("/tmp/file-2");
		ObjectInputStream in;
		try {
		in = new ObjectInputStream(new FileInputStream(f));
		int numTrees = (int) in.readInt();
		double[][] allTheta  = (double[][]) in.readObject();
		double[][] allX = (double[][]) in.readObject();
		int[][] theta_inst_idxs = (int [][]) in.readObject();
		double[] y = (double[]) in.readObject();
		int[][] dataIdxs = (int [][]) in.readObject();
		RegtreeBuildParams params = (RegtreeBuildParams) in.readObject();
		
		in.close();
	
		learnModel(numTrees, allTheta, allX, theta_inst_idxs, y, dataIdxs, params);
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		
		
	}
    
    /**
     * Learns a random forest putting the specified data points into each tree.
     * @see RegtreeFit.fit
     */
    public static RandomForest learnModel(int numTrees, double[][] allTheta, double[][] allX, int[][] theta_inst_idxs, double[] y, int[][] dataIdxs, RegtreeBuildParams params) {       
   	boolean writeOutput = true;
	if(writeOutput)
	{
		File f = new File("/tmp/file-2");
		f.delete();
		
		try { 
		ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream(f));
		
		o.writeInt(numTrees);
		o.writeObject(allTheta);
		o.writeObject(allX);
		o.writeObject(theta_inst_idxs);
		o.writeObject(y);
		o.writeObject(dataIdxs);
		o.writeObject(params);
		
		
		System.out.println("Calls written & deleted to: /tmp/file-2" );
		o.close();
		} catch(IOException e)
		{
			System.err.println(e);
		}
		
	}
... REST OF METHOD ...
}