fin arbre

DEV3.2/arbre/prefixe/OperatorNode.java

@@ -0,0 +1,16 @@
+// Nœud opérateur
+    public class OperatorNode extends Node {
+        String operator;
+        Node left, right;
+
+        OperatorNode(String operator, Node left, Node right) {
+            this.operator = operator;
+            this.left = left;
+            this.right = right;
+        }
+
+        @Override
+        public String toPrefix() {
+            return operator + " " + left.toPrefix() + " " + right.toPrefix();
+        }
+    }