added comments

src/jat/examples/ThreeBodyExample/ThreeBodyAPL.java

@@ -18,7 +18,9 @@ public class ThreeBodyAPL extends ThreeBody implements FirstOrderDifferentialEqu
 	public ArrayList<Double> ysol = new ArrayList<Double>();
 	public ArrayList<Double> zsol = new ArrayList<Double>();
 	protected double[] randv[];
+
 	public ThreeBodyAPL(double G, double m1, double m2, double m3) {
+		//constructor
 		super(G, m1, m2, m3);
 		this.randv();
 	}
@@ -65,13 +67,14 @@ public class ThreeBodyAPL extends ThreeBody implements FirstOrderDifferentialEqu
 	}
 
 	public StepHandler stepHandler = new StepHandler() {
+		//step handler for dp853 integrator
 		public void init(double t0, double[] y0, double t) {
 		}
 
 		public void handleStep(StepInterpolator interpolator, boolean isLast) {
 			double t = interpolator.getCurrentTime();
 			double[] y = interpolator.getInterpolatedState();
-			System.out.println(t + " " + y[0] + " " + y[1]+ " " + y[2]);
+			System.out.println(t + " " + y[0] + " " + y[1]+ " " + y[2]); //prints time and xyz positions
 			time.add(t);
 			xsol.add(y[0]);
 			ysol.add(y[1]);

src/jat/examples/ThreeBodyExample/ThreeBodyExample.java

@@ -95,6 +95,7 @@ public class ThreeBodyExample {
 		double[] max = { plotSize, plotSize };
 
 		p.setFixedBounds(min, max);
+
 		// test outputs
 		// output derivatives
 		for (int i = 0; i< derivs.length; i++)