feat: update structure

cs2030s/labs/Lab6/And.java

@@ -0,0 +1,38 @@
+/**
+ * Represents the And type, a conditional which returns true if both left and
+ * right values are true. This operator short circuits, which means if the first
+ * value is false, the right value is not evaluated
+ */
+class And implements Cond {
+  private Cond lVal;
+  private Cond rVal;
+
+  /**
+   * Constructor for the And conditional.
+   * 
+   * @param lVal the left value in the And Operation.
+   * @param rVal This is only evaluated if lVal is true
+   */
+  public And(Cond lVal, Cond rVal) {
+    this.lVal = lVal;
+    this.rVal = rVal;
+  }
+
+  @Override
+  public boolean eval() {
+    if (!this.lVal.eval()) {
+      return false;
+    }
+    return this.rVal.eval();
+  }
+
+  @Override
+  public String toString() {
+    return "(" + this.lVal + " & " + this.rVal + ")";
+  }
+
+  @Override
+  public Cond neg() {
+    return new Or(lVal.neg(), rVal.neg());
+  }
+}