Update 18.3.2022

Rechner/src/Calculator.java

@@ -0,0 +1,19 @@
+
+public class Calculator {
+
+	Node<Symbol> erzeugeBeispielBaum() {
+	
+		Node<Symbol> root = new Node<Symbol>(new Symbol("+"));
+		
+		root.left = new Node<Symbol>(new Symbol("3"));
+		
+		root.right = new Node<Symbol>(new Symbol("*"));
+		
+		root.right.left = new Node<Symbol>(new Symbol("5"));
+		
+		root.right.right = new Node<Symbol>(new Symbol("8"));
+	
+		return root;
+	}
+	
+}

Rechner/src/Symbol.java

@@ -15,4 +15,16 @@ public class Symbol {
 	public boolean istPlus() {
 		return s == "+";
 	}
+	
+	public boolean istOperator() {
+		return istPlus() || istMal();
+	}
+	
+	public boolean istZahl() {
+		return !istOperator();
+	}
+	
+	public int getInt() {
+		return Integer.parseInt(s);
+	}
 }

Rechner/src/Test.java

@@ -0,0 +1,11 @@
+
+public class Test {
+
+	public static void main(String[] args) {
+		
+		Calculator c = new Calculator();
+		
+		Node<Symbol> root = c.erzeugeBeispielBaum();
+	}
+
+}