diff --git a/BianrySearch.java b/BianrySearch.java
new file mode 100644
index 0000000..bf6f3fa
--- /dev/null
+++ b/BianrySearch.java
@@ -0,0 +1,47 @@
+import edu.princeton.cs.algs4.In;
+import edu.princeton.cs.algs4.StdIn;
+import edu.princeton.cs.algs4.StdOut;
+import java.io.FileInputStream;
+import java.util.Arrays;
+
+public class BianrySearch {
+    
+    
+    public static int rank(int k,int[] a){
+        int lo=0;
+        int hi=a.length-1;
+        while(lo<=hi){
+            int mid=(lo+hi)/2;
+            if(k>a[mid]){
+                lo=mid+1;
+            }
+            else if(k<a[mid]){
+                hi=mid-1;
+            }
+            else{
+                return mid;
+            }
+        }
+        return -1;
+    }
+    
+    public static void main(String args[]){
+        
+         FileInputStream ins;
+          //输入重定向
+        try{
+           ins = new FileInputStream("F:\\所有学习的课程资料\\算法\\课本例题代码数据/tinyT.txt");
+        System.setIn(ins);
+        }catch(Exception e){
+            System.out.println(e.toString());
+        }
+        
+        int[] whitelist=In.readInts(args[0]);
+        Arrays.sort(whitelist);
+        while(!StdIn.isEmpty()){
+            int key=StdIn.readInt();
+            if(rank(key,whitelist)<0)
+                StdOut.println(key);
+        }
+    }
+}
diff --git a/hello.txt b/hello.txt
new file mode 100644
index 0000000..e69de29
diff --git a/jjcc.java b/jjcc.java
new file mode 100644
index 0000000..0f82148
--- /dev/null
+++ b/jjcc.java
@@ -0,0 +1,35 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author dell
+ */
+public class jjcc {
+    public static void main(String[] args)
+    {
+        System.out.println(add(1,2));
+        System.out.println(sub(1,2));
+        System.out.println(mul(1,2));
+        System.out.println(div(1,2));
+    }
+    public static double add(double a,double b)
+    {
+        return a+b;
+    }
+    public static double sub(double a,double b)
+    {
+        return a-b;
+    }
+    public static double mul(double a,double b)
+    {
+        return a*b;
+    }
+    public static double div(double a,double b)
+    {
+        return (double)a/b;
+    }
+}
\ No newline at end of file