Initial commit

Temp/Student.java

@@ -0,0 +1,14 @@
+public class Student {
+    // 单例模式
+    private static Student instance = null;
+
+    private Student() {
+    }
+
+    public static Student getInstance() {
+        if (instance == null) {
+            instance = new Student();
+        }
+        return instance;
+    }
+}