added some toString's

src/main/java/de/neemann/digital/core/wiring/bus/CommonBusValue.java

@@ -3,6 +3,8 @@ package de.neemann.digital.core.wiring.bus;
 import de.neemann.digital.core.ObservableValue;
 import de.neemann.digital.core.Observer;
 
+import java.util.Arrays;
+
 /**
  * This observer is added to all outputs connected together
  */
@@ -67,4 +69,11 @@ public final class CommonBusValue extends ObservableValue implements Observer {
                 return i;
         return null;
     }
+
+    @Override
+    public String toString() {
+        return "CommonBusValue{"
+                + "inputs=" + Arrays.toString(inputs)
+                + "', -->" + super.toString() + " }";
+    }
 }

src/main/java/de/neemann/digital/core/wiring/bus/ConnectedBusHandler.java

@@ -77,6 +77,7 @@ public final class ConnectedBusHandler extends AbstractBusHandler {
         for (ObservableValue val : values)
             val.set(value, highz);
     }
+
     @Override
     public ObservableValues getAllValues() {
         return new ObservableValues.Builder().add(getInputs()).add(values).build();
@@ -88,4 +89,10 @@ public final class ConnectedBusHandler extends AbstractBusHandler {
     public ArrayList<CommonBusValue> getValues() {
         return values;
     }
+
+    @Override
+    public String toString() {
+        return "ConnectedBusHandler{"
+                + "values=" + values + '}';
+    }
 }