diff --git a/pro_02.java b/pro_02.java
new file mode 100644
index 0000000..790b9ab
--- /dev/null
+++ b/pro_02.java
@@ -0,0 +1,6 @@
+int i=0;//初始化 i为0
+while(i<10){//进入循环前先判断条件是否为true
+   System.out.println("hello world!");
+   i++;//每一次循环结束前i自增1
+}
+System.out.println("while循环结束了。i="+i);
\ No newline at end of file