add machugaoxiao code

yi-yun · yi-yun · commit 7f66c89580d4 · 2019-09-07T14:53:25.000+08:00
diff --git a/java_test/src/main/java/com/yiyun/ClassTest.java b/java_test/src/main/java/com/yiyun/ClassTest.java
@@ -0,0 +1,49 @@
+package com.yiyun;
+
+import java.lang.reflect.Field;
+
+/**
+ * @class: ClassTest
+ * @description: Class 测试
+ * @author: yi-yun
+ * @create: 2019-09-07 14:29
+ **/
+public class ClassTest {
+    private static int[] array = new int[3];
+    private static int length = array.length;
+    private static Class<One> one = One.class;
+    private static Class<Another> another = Another.class;
+
+    public static void main(String[] args) throws Exception {
+        One oneObject = ClassTest.one.newInstance();
+        oneObject.call();
+
+        Another anotherObject = ClassTest.another.newInstance();
+        anotherObject.speak();
+
+        Field inner = one.getDeclaredField("inner");
+        inner.setAccessible(true);
+
+        inner.set(oneObject, "world change");
+        System.out.println(oneObject.getInner());
+         
+    }
+}
+
+class One {
+    private String inner = "time flies...";
+
+    public void call() {
+        System.out.println("hello world");
+    }
+
+    public String getInner() {
+        return inner;
+    }
+}
+
+class Another {
+    public void speak() {
+        System.out.println("easy coding...");
+    }
+}
diff --git a/java_test/src/main/java/com/yiyun/TestStringBuffer.java b/java_test/src/main/java/com/yiyun/TestStringBuffer.java
@@ -4,11 +4,17 @@
 
 public class TestStringBuffer {
     @Test
-    public void fun(){
+    public void fun() {
         final StringBuffer stringBuffer = new StringBuffer("yi-yun");
         System.out.println("stringBuffer = " + stringBuffer.hashCode());
         stringBuffer.append("hello");
         System.out.println("stringBuffer = " + stringBuffer.hashCode());
-        
+    }
+
+    @Test
+    public void fun1() {
+        String a = "hello";
+        String b = "hello";
+        System.out.println(a == b);
     }
 }
