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+# 如何用0向左补齐一个整数？
+
+## 问题
+
+在Java中如何把一个整数转化为字符串并且用0向左补齐呢？
+
+我基本上是希望把一个不大于9999的整数用0补齐 （比如说1=“0001”）。
+
+## 解答
+
+    String.format("%05d", yournumber);
+
+可以将一个五位数用0补齐。
+
+
+https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html
+
+Stackoverflow链接：http://stackoverflow.com/questions/473282/how-can-i-pad-an-integers-with-zeros-on-the-left