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diff --git a/src/main/java/io/devnulllabs/openjava/ptree/ConditionalExpression.java b/src/main/java/io/devnulllabs/openjava/ptree/ConditionalExpression.java
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+/*
+ * ConditionalExpression.java 1.0
+ *
+ *
+ * Jun 20, 1997 by mich
+ * Sep 29, 1997 by bv
+ * Oct 10, 1997 by mich
+ *
+ * @see io.devnulllabs.openjava.ptree.ParseTree
+ * @version 1.0 last updated:  Oct 10, 1997
+ * @author  Michiaki Tatsubori
+ */
+package io.devnulllabs.openjava.ptree;
+
+import io.devnulllabs.openjava.mop.Environment;
+import io.devnulllabs.openjava.mop.OJClass;
+import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
+
+/**
+ * The <code>ConditionalExpression</code> class represents
+ * a conditional expression like:
+ * <br><blockquote><pre>
+ *     (i == 1) ? 3 : 4
+ * </pre></blockquote><br>
+ * This consists of a conditional part, true case part, and
+ * false case part.
+ * Each part of them is an expression.
+ * <br>
+ * If the operator in the expression of the operands has week unity,
+ * this automatically produces the code in which the operands
+ * are enclosed by parenthesises.
+ * <br>
+ * In the case the conditional part is <code>f = f()</code>,
+ * the true case part is <code>"red"</code>
+ * and the false case part is <code>str = "blue"</code>
+ * this produces the code :
+ * <br><blockquote><pre>
+ *     (f = f()) ? "red" : (str = "blue")
+ * </pre></blockquote><br>
+ *
+ * @see io.devnulllabs.openjava.ptree.Expression
+ */
+public class ConditionalExpression extends NonLeaf implements Expression {
+    /**
+     * Allocates a new conditional expression object.
+     *
+     * @param  condition  the conditional part of this expression.
+     * @param  truecase  the expression to be evaluated when conditional
+     *                   part is true.
+     * @param  falsecase  the expression to be evaluated when conditional
+     *                    part is false.
+     */
+    public ConditionalExpression(
+        Expression condition,
+        Expression truecase,
+        Expression falsecase) {
+        super();
+        set(condition, truecase, falsecase);
+    }
+
+    ConditionalExpression() {
+        super();
+    }
+
+    /**
+     * Gets the conditional part of this conditional expression.
+     *
+     * @return  the expression of this conditional part.
+     */
+    public Expression getCondition() {
+        return (Expression) elementAt(0);
+    }
+
+    /**
+     * Sets the conditional part of this conditional expression.
+     *
+     * @param  expr  the expression to set as this conditional part.
+     */
+    public void setCondition(Expression expr) {
+        setElementAt(expr, 0);
+    }
+
+    /**
+     * Gets the true case part of this conditional expression.
+     *
+     * @return  the expression of this true case part.
+     */
+    public Expression getTrueCase() {
+        return (Expression) elementAt(1);
+    }
+
+    /**
+     * Sets the true case part of this conditional expression.
+     *
+     * @param  expr  the expression to set as this true part.
+     */
+    public void setTrueCase(Expression expr) {
+        setElementAt(expr, 1);
+    }
+
+    /**
+     * Gets the false case part of this.
+     *
+     * @return  the expression of this false case part.
+     */
+    public Expression getFalseCase() {
+        return (Expression) elementAt(2);
+    }
+
+    /**
+     * Sets the false case part of this.
+     *
+     * @param  expr  the expression to set as this false part.
+     */
+    public void setFalseCase(Expression expr) {
+        setElementAt(expr, 2);
+    }
+
+    public void accept(ParseTreeVisitor v) throws ParseTreeException {
+        v.visit(this);
+    }
+
+    public OJClass getType(Environment env) throws Exception {
+        return BinaryExpression.chooseType(
+            getTrueCase().getType(env),
+            getFalseCase().getType(env));
+    }
+
+}