1 files changed, 19 insertions, 0 deletions
diff --git a/BitString.java b/BitString.java
new file mode 100644
index 0000000..3060178
--- /dev/null
+++ b/BitString.java
@@ -0,0 +1,19 @@
+import java.lang.StringBuilder;
+
+class BitString extends java.util.BitSet {
+    public BitString(String s) {
+	for (int i=0; i<s.length(); i++)
+	    set(i, s.charAt(i) == '1');
+    }
+
+    public String toString() {
+	return toString(length());
+    }
+
+    public String toString(int size) {
+	java.lang.StringBuilder res = new java.lang.StringBuilder();
+	for (int i=0; i<size; i++)
+	    res.append(get(i)? "1" : "0");
+	return res.toString();
+    }
+}