5 files changed, 48 insertions, 0 deletions
diff --git a/dotnet/Mammoth/Couscous/java/lang/IndexOutOfBoundsException.cs b/dotnet/Mammoth/Couscous/java/lang/IndexOutOfBoundsException.cs
new file mode 100644
index 0000000..c56c7c1
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/java/lang/IndexOutOfBoundsException.cs
@@ -0,0 +1,7 @@
+using System;
+
+namespace Mammoth.Couscous.java.lang {
+	internal class IndexOutOfBoundsException : RuntimeException {
+	}
+}
+
diff --git a/dotnet/Mammoth/Couscous/java/lang/RuntimeException.cs b/dotnet/Mammoth/Couscous/java/lang/RuntimeException.cs
new file mode 100644
index 0000000..cf882aa
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/java/lang/RuntimeException.cs
@@ -0,0 +1,13 @@
+using System;
+
+namespace Mammoth.Couscous.java.lang
+{
+	internal class RuntimeException : Exception {
+		internal RuntimeException() : base() {
+		}
+		
+		internal RuntimeException(string message) : base(message) {
+		}
+	}
+}
+
diff --git a/dotnet/Mammoth/Couscous/java/lang/String.cs b/dotnet/Mammoth/Couscous/java/lang/String.cs
new file mode 100644
index 0000000..bd0838d
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/java/lang/String.cs
@@ -0,0 +1,7 @@
+namespace Mammoth.Couscous.java.lang {
+    internal partial class String {
+        internal static string join(string separator, Iterable<string> values) {
+            return string.Join(separator, FromJava.IterableToEnumerable(values));
+        }
+    }
+}
diff --git a/dotnet/Mammoth/Couscous/java/lang/StringBuilder.cs b/dotnet/Mammoth/Couscous/java/lang/StringBuilder.cs
new file mode 100644
index 0000000..c894936
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/java/lang/StringBuilder.cs
@@ -0,0 +1,14 @@
+namespace Mammoth.Couscous.java.lang {
+    internal class StringBuilder {
+        private readonly System.Text.StringBuilder _builder = new System.Text.StringBuilder();
+        
+        internal StringBuilder append(string value) {
+            _builder.Append(value);
+            return this;
+        }
+        
+        internal string toString() {
+            return _builder.ToString();
+        }
+    }
+}
diff --git a/dotnet/Mammoth/Couscous/java/lang/UnsupportedOperationException.cs b/dotnet/Mammoth/Couscous/java/lang/UnsupportedOperationException.cs
new file mode 100644
index 0000000..da86874
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/java/lang/UnsupportedOperationException.cs
@@ -0,0 +1,7 @@
+using System;
+
+namespace Mammoth.Couscous.java.lang {
+	internal class UnsupportedOperationException : RuntimeException {
+	}
+}
+