3 files changed, 26 insertions, 6 deletions
diff --git a/src/newt/classes/com/jogamp/newt/Window.java b/src/newt/classes/com/jogamp/newt/Window.java
index 99089d3d7..a5c0711df 100644
--- a/src/newt/classes/com/jogamp/newt/Window.java
+++ b/src/newt/classes/com/jogamp/newt/Window.java
@@ -1048,6 +1048,15 @@ public interface Window extends NativeWindow, WindowClosingProtocol, ScalableSur
 
     void runOnEDTIfAvail(boolean wait, final Runnable task);
 
+    /**
+     * Appends this class string representation to the given {@link StringBuilder} instance
+     * @param sb given instance where this class string representation is added to
+     * @return the given {@link StringBuilder} for chaining
+     */
+    StringBuilder append(StringBuilder sb);
+
+    @Override
+    String toString();
 
     //
     // WindowListener
diff --git a/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java b/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
index 569780311..b448b725d 100644
--- a/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
+++ b/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
@@ -535,9 +535,18 @@ public class GLWindow extends GLAutoDrawableBase implements GLAutoDrawable, Wind
     }
 
     @Override
+    public final StringBuilder append(final StringBuilder sb) {
+        sb.append("NEWT-GLWindow[ \n\tHelper: " + helper + ", \n\tDrawable: " + drawable +
+               ", \n\tContext: " + context + ", \n\tWindow: ");
+        window.append(sb);
+        // sb.append(", \n\tFactory: "+factory);
+        sb.append("]");
+        return sb;
+    }
+
+    @Override
     public final String toString() {
-        return "NEWT-GLWindow[ \n\tHelper: " + helper + ", \n\tDrawable: " + drawable +
-               ", \n\tContext: " + context + ", \n\tWindow: "+window+ /** ", \n\tFactory: "+factory+ */ "]";
+        return append(new StringBuilder()).toString();
     }
 
     @Override
diff --git a/src/newt/classes/jogamp/newt/WindowImpl.java b/src/newt/classes/jogamp/newt/WindowImpl.java
index fbf448480..78da0e0ad 100644
--- a/src/newt/classes/jogamp/newt/WindowImpl.java
+++ b/src/newt/classes/jogamp/newt/WindowImpl.java
@@ -2755,9 +2755,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
     }
 
     @Override
-    public final String toString() {
-        final StringBuilder sb = new StringBuilder();
-
+    public final StringBuilder append(final StringBuilder sb) {
         sb.append(getClass().getName()+"[State "+getStateMaskString()+
                     ",\n Reconfig "+getSupportedStateMaskString()+
                     ",\n "+screen+
@@ -2791,7 +2789,11 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
           sb.append(keyListeners.get(i)+", ");
         }
         sb.append("], windowLock "+windowLock+", surfaceLockCount "+surfaceLockCount+"]");
-        return sb.toString();
+        return sb;
+    }
+    @Override
+    public final String toString() {
+        return append(new StringBuilder()).toString();
     }
 
     protected final void setWindowHandle(final long handle) {