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diff --git a/‎contents/why-does-this-code-using-random-strings-print-hello-world.md
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+3-1Lines changed: 3 additions & 1 deletion b/‎contents/why-does-this-code-using-random-strings-print-hello-world.md
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+3-1Lines changed: 3 additions & 1 deletion
@@ -61,4 +61,6 @@ public static String randomString(int i)
     15 + 96 = 111 --> o
     18 + 96 = 114 --> r
     12 + 96 = 108 --> l
-    4  + 96 = 100 --> d
+    4  + 96 = 100 --> d
+
+stackoverflow链接：http://stackoverflow.com/questions/15182496/why-does-this-code-using-random-strings-print-hello-world