diff --git a/prism/src/prism/PrismFileLog.java b/prism/src/prism/PrismFileLog.java
index c1cd3c58..62f29203 100644
--- a/prism/src/prism/PrismFileLog.java
+++ b/prism/src/prism/PrismFileLog.java
@@ -26,7 +26,7 @@
 
 package prism;
 
-public class PrismFileLog implements PrismLog
+public class PrismFileLog extends PrismLog
 {
 	String filename;
 	long fp;
@@ -71,6 +71,23 @@ public class PrismFileLog implements PrismLog
 		return (fp != 0);
 	}
 
+	public long getFilePointer()
+	{
+		return fp;
+	}
+
+	public void flush()
+	{
+		PrismNative.PN_FlushFile(fp);
+	}
+
+	public void close()
+	{
+		if (!stdout) PrismNative.PN_CloseFile(fp);
+	}
+	
+	// Basic print methods
+	
 	public void print(boolean b)
 	{
 		printToLog("" + b);
@@ -111,83 +128,11 @@ public class PrismFileLog implements PrismLog
 		printToLog(s);
 	}
 
-	public void print(double d[])
-	{
-		int i, n;
-		n = d.length;
-		for (i = 0; i < n; i++) {
-			if (i > 0)
-				printToLog(" ");
-			printToLog("" + d[i]);
-		}
-	}
-
 	public void println()
 	{
 		printToLog("\n");
 	}
 
-	public void println(boolean b)
-	{
-		printToLog(b + "\n");
-	}
-
-	public void println(char c)
-	{
-		printToLog(c + "\n");
-	}
-
-	public void println(double d)
-	{
-		printToLog(d + "\n");
-	}
-
-	public void println(float f)
-	{
-		printToLog(f + "\n");
-	}
-
-	public void println(int i)
-	{
-		printToLog(i + "\n");
-	}
-
-	public void println(long l)
-	{
-		printToLog(l + "\n");
-	}
-
-	public void println(Object obj)
-	{
-		printToLog(obj + "\n");
-	}
-
-	public void println(String s)
-	{
-		printToLog(s + "\n");
-	}
-
-	public void println(double d[])
-	{
-		print(d);
-		println();
-	}
-
-	public long getFilePointer()
-	{
-		return fp;
-	}
-
-	public void flush()
-	{
-		PrismNative.PN_FlushFile(fp);
-	}
-
-	public void close()
-	{
-		if (!stdout) PrismNative.PN_CloseFile(fp);
-	}
-	
 	private void printToLog(String s)
 	{
 		PrismNative.PN_PrintToFile(fp, s);
diff --git a/prism/src/prism/PrismLog.java b/prism/src/prism/PrismLog.java
index 29e14bce..f4a31bc4 100644
--- a/prism/src/prism/PrismLog.java
+++ b/prism/src/prism/PrismLog.java
@@ -26,31 +26,104 @@
 
 package prism;
 
-public interface PrismLog
+public abstract class PrismLog
 {
-	boolean ready();
-	void print(boolean b);
-	void print(char c);
-	void print(double d);
-	void print(float f);
-	void print(int i);
-	void print(long l);
-	void print(Object obj);
-	void print(String s);
-	void print(double d[]);
-	void println();
-	void println(boolean b);
-	void println(char c);
-	void println(double d);
-	void println(float f);
-	void println(int i);
-	void println(long l);
-	void println(Object obj);
-	void println(String s);
-	void println(double d[]);
-	long getFilePointer();
-	void flush();
-	void close();
+	public abstract boolean ready();
+	public abstract long getFilePointer();
+	public abstract void flush();
+	public abstract void close();
+	
+	public abstract void print(boolean b);
+	public abstract void print(char c);
+	public abstract void print(double d);
+	public abstract void print(float f);
+	public abstract void print(int i);
+	public abstract void print(long l);
+	public abstract void print(Object obj);
+	public abstract void print(String s);
+	public abstract void println();
+	
+	public void print(Object arr[])
+	{
+		int i, n = arr.length;
+		print("[");
+		for (i = 0; i < n; i++) {
+			print(i > 0 ? ", " : "");
+			print(arr[i]);
+		}
+		print("]");
+	}
+
+	public void print(int arr[])
+	{
+		int i, n = arr.length;
+		print("[");
+		for (i = 0; i < n; i++) {
+			print(i > 0 ? ", " : "");
+			print(arr[i]);
+		}
+		print("]");
+	}
+
+	public void println(boolean b)
+	{
+		print(b);
+		println();
+	}
+
+	public void println(char c)
+	{
+		print(c);
+		println();
+	}
+
+	public void println(double d)
+	{
+		print(d);
+		println();
+	}
+
+	public void println(float f)
+	{
+		print(f);
+		println();
+	}
+
+	public void println(int i)
+	{
+		print(i);
+		println();
+	}
+
+	public void println(long l)
+	{
+		print(l);
+		println();
+	}
+
+	public void println(Object o)
+	{
+		print(o);
+		println();
+	}
+
+	public void println(String s)
+	{
+		print(s);
+		println();
+	}
+
+	public void println(double arr[])
+	{
+		print(arr);
+		println();
+	}
+
+	public void println(int arr[])
+	{
+		print(arr);
+		println();
+	}
 }
 
 //------------------------------------------------------------------------------
diff --git a/prism/src/prism/PrismPrintStreamLog.java b/prism/src/prism/PrismPrintStreamLog.java
index 1e52786e..f840b1ab 100644
--- a/prism/src/prism/PrismPrintStreamLog.java
+++ b/prism/src/prism/PrismPrintStreamLog.java
@@ -31,7 +31,7 @@ import java.io.*;
 /**
  * Implementation of the PrismLog interface that passed all output to a PrintStream object.
  */
-public class PrismPrintStreamLog implements PrismLog
+public class PrismPrintStreamLog extends PrismLog
 {
 	PrintStream out = null;
 	
@@ -55,6 +55,24 @@ public class PrismPrintStreamLog implements PrismLog
 		return out != null;
 	}
 
+	public long getFilePointer()
+	{
+		// This implementation is Java only so does not return a file pointer.
+		return -1;
+	}
+	
+	public void flush()
+	{
+		out.flush();
+	}
+
+	public void close()
+	{
+		out.close();
+	}
+	
+	// Basic print methods
+	
 	public void print(boolean b)
 	{
 		out.print(b);
@@ -95,83 +113,10 @@ public class PrismPrintStreamLog implements PrismLog
 		out.print(s);
 	}
 
-	public void print(double d[])
-	{
-		int i, n;
-		n = d.length;
-		for (i = 0; i < n; i++) {
-			if (i > 0)
-				out.print(" ");
-			out.print(d[i]);
-		}
-	}
-
 	public void println()
 	{
 		out.println();
 	}
-
-	public void println(boolean b)
-	{
-		out.println(b);
-	}
-
-	public void println(char c)
-	{
-		out.println(c);
-	}
-
-	public void println(double d)
-	{
-		out.println(d);
-	}
-
-	public void println(float f)
-	{
-		out.println(f);
-	}
-
-	public void println(int i)
-	{
-		out.println(i);
-	}
-
-	public void println(long l)
-	{
-		out.println(l);
-	}
-
-	public void println(Object obj)
-	{
-		out.println(obj);
-	}
-
-	public void println(String s)
-	{
-		out.println(s);
-	}
-
-	public void println(double d[])
-	{
-		print(d);
-		println();
-	}
-
-	public long getFilePointer()
-	{
-		// This implementation is Java only so does not return a file pointer.
-		return -1;
-	}
-	
-	public void flush()
-	{
-		out.flush();
-	}
-
-	public void close()
-	{
-		out.close();
-	}
 }
 
 //------------------------------------------------------------------------------
diff --git a/prism/src/userinterface/log/GUIVisualLogModel.java b/prism/src/userinterface/log/GUIVisualLogModel.java
index 43bf986b..2fdd57c0 100644
--- a/prism/src/userinterface/log/GUIVisualLogModel.java
+++ b/prism/src/userinterface/log/GUIVisualLogModel.java
@@ -66,7 +66,7 @@ import prism.PrismLog;
  *        </code>
  * </ul>
  */
-public class GUIVisualLogModel implements PrismLog
+public class GUIVisualLogModel extends PrismLog
 {
     
     //Attributes
@@ -248,12 +248,12 @@ public class GUIVisualLogModel implements PrismLog
 	return theModel;
     }
 
-    /*These methods are so that this can implement the PrismLog interface
-     */
-    public void close()
+    // Methods required by PrismLog abstract class
+    
+    public boolean ready()
     {
+        return true;
     }
-    
     public long getFilePointer()
     {
         return -1;
@@ -263,6 +263,10 @@ public class GUIVisualLogModel implements PrismLog
 	{
 	}
 
+    public void close()
+    {
+    }
+    
     public void print(long l)
     {
         print(NORMAL, ""+l);
@@ -312,57 +316,7 @@ public class GUIVisualLogModel implements PrismLog
     {
         println(NORMAL, "");
     }
-    
-    public void println(float f)
-    {
-        println(NORMAL,""+f);
-    }
-    
-    public void println(double d)
-    {
-         println(NORMAL,""+d);
-    }
-    
-    public void println(Object obj)
-    {
-         println(NORMAL,""+obj);
-    }
-    
-    public void println(int i)
-    {
-         println(NORMAL,""+i);
-    }
-    
-    public void println(char c)
-    {
-         println(NORMAL,""+c);
-    }
-    
-    public void println(boolean b)
-    {
-         println(NORMAL,""+b);
-    }
-    
-    public void println(String s)
-    {
-         println(NORMAL,""+s);
-    }
-    
-    public void println(double d[])
-    {
-         println(NORMAL,""+d);
-    }
-    
-    public void println(long l)
-    {
-         println(NORMAL,""+l);
-    }
-    
-    public boolean ready()
-    {
-        return true;
-    }
-    
+        
     /** Because the entries have to be called from Threads, the invokeLater method is
      * used to add entries using this Thread.
      */    
diff --git a/prism/src/userinterface/log/GUIWindowLog.java b/prism/src/userinterface/log/GUIWindowLog.java
index 851d591b..4cde8eb5 100644
--- a/prism/src/userinterface/log/GUIWindowLog.java
+++ b/prism/src/userinterface/log/GUIWindowLog.java
@@ -33,10 +33,9 @@ import javax.swing.event.CaretListener;
 import javax.swing.text.BadLocationException;
 
 import prism.*;
-import userinterface.GUIPlugin;
 import userinterface.util.GUIEvent;
 
-public class GUIWindowLog implements PrismLog
+public class GUIWindowLog extends PrismLog
 {
 	// text area swing object where all text will be echoed
 	private JTextArea textArea;
@@ -83,6 +82,21 @@ public class GUIWindowLog implements PrismLog
 		return (textArea != null);
 	}
 
+	public long getFilePointer()
+	{
+		return -1;
+	}
+
+	public void flush()
+	{
+	}
+
+	public void close()
+	{
+	}
+
+	// Basic print methods
+	
 	public void print(boolean b)
 	{
 		addToBuffer("" + b);
@@ -123,86 +137,16 @@ public class GUIWindowLog implements PrismLog
 		addToBuffer(s);
 	}
 
-	public void print(double d[])
-	{
-		int i, n;
-		n = d.length;
-		for (i = 0; i < n; i++) {
-			if (i > 0)
-				addToBuffer(" ");
-			addToBuffer("" + d[i]);
-		}
-	}
-
 	public void println()
 	{
 		addToBuffer("\n");
 	}
 
-	public void println(boolean b)
-	{
-		addToBuffer("" + b + "\n");
-	}
-
-	public void println(char c)
-	{
-		addToBuffer("" + c + "\n");
-	}
-
-	public void println(double d)
-	{
-		addToBuffer("" + d + "\n");
-	}
-
-	public void println(float f)
-	{
-		addToBuffer("" + f + "\n");
-	}
-
-	public void println(int i)
-	{
-		addToBuffer("" + i + "\n");
-	}
-
-	public void println(long l)
-	{
-		addToBuffer("" + l + "\n");
-	}
-
-	public void println(Object obj)
-	{
-		addToBuffer("" + obj + "\n");
-	}
-
-	public void println(String s)
-	{
-		addToBuffer(s + "\n");
-	}
-
-	public void println(double d[])
-	{
-		print(d);
-		println();
-	}
-
-	public long getFilePointer()
-	{
-		return -1;
-	}
-
-	public void flush()
-	{
-	}
-
 	public void clear()
 	{
 		setClearFlag();
 	}
 
-	public void close()
-	{
-	}
-
 	public int getMaxTextLength()
 	{
 		return updater.getMaxTextLength();