sam

data/3.Java高阶/1.通过行为参数化传递代码/1.应对不断变化的需求/config.json

-{
-  "node_id": "java-0a39f4040da04b8591f9b36f3c446789",
-  "keywords": [],
-  "children": [
-    {
-      "初试牛刀：筛选绿苹果": {
-        "keywords": [],
-        "children": [],
-        "node_id": "java-e888465b1043473fbb919fd4958e3179",
-        "title": "初试牛刀：筛选绿苹果"
-      }
-    },
-    {
-      "再展身手：把颜色作为参数": {
-        "keywords": [],
-        "children": [],
-        "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
-        "title": "再展身手：把颜色作为参数"
-      }
-    },
-    {
-      "第三次尝试：对你能想到的每个属性做筛选": {
-        "keywords": [],
-        "children": [],
-        "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
-        "title": "第三次尝试：对你能想到的每个属性做筛选"
-      }
-    }
-  ],
-  "export": [],
-  "title": "应对不断变化的需求"
-}
\ No newline at end of file

data/3.Java高阶/1.通过行为参数化传递代码/3.对付啰唆/config.json → data/3.Java高阶/1.通过行为参数化传递代码/3.简写/config.json

@@ -34,6 +34,6 @@
       }
     }
   ],
-  "export": [],
+  "export": ["sam.json"],
   "title": "对付啰唆"
 }
\ No newline at end of file

data/3.Java高阶/1.通过行为参数化传递代码/3.简写/sam.md

+# Single Abstract Method
+
+下面哪一个类型定义，在构造其对象时，可以简化为 lambda？
+
+## 答案
+
+```java
+public interface Parsec<E, T> {
+    default T ask(State<E> state) {
+        try {
+            return new Success(this.parse(state));
+        } catch (Exception error){
+            return new Failure(error);
+        }
+    }
+    
+    T parse(State<E> state); 
+} 
+```
+
+## 选项
+
+### SAM 需要 interface
+
+```java
+public abstract class Element {
+    String read();
+    void write(String content);
+}
+```
+
+### 有两个未定义方法
+
+```java
+public interface Element {
+    String read();
+    void write(String content);
+}
+```
+
+### 没有抽象方法，无法按 SAM 处理
+
+```java
+public class Cell {
+    String content;
+    public Cell(String content){
+        this.content = content;
+    }
+    public String text() {
+        return content;
+    }
+    public String text(String content){
+        this.content = content;
+    }
+}
+```