first commit

src/test/java/io/Test.java

@@ -0,0 +1,12 @@
+package io;
+
+public class Test {
+
+    @org.junit.Test
+    public void test01(){
+        String a = "dsadasdasdas";
+        String substring = a.substring(5, 1);
+        System.out.println(substring);
+    }
+
+}