Add StringIndexOutOfBoundsException and use it in String

classpath/java/lang/StringIndexOutOfBoundsException.java

@@ -0,0 +1,19 @@
+package java.lang;
+
+/**
+ * Used by <code>String</code> to signal that a given index is either less than
+ * or greater than the allowed range.
+ */
+public class StringIndexOutOfBoundsException extends IndexOutOfBoundsException {
+  private static final long serialVersionUID = -6762910422159637258L;
+
+  public StringIndexOutOfBoundsException(int index) {
+    super("String index out of range: "+index);
+  }
+
+  public StringIndexOutOfBoundsException(String message) {
+	super(message);
+  }
+
+  public StringIndexOutOfBoundsException() {}
+}