静态与非静态内部类Java、Kotlin对比实现

BetterZhang · Jun 28, 2017 · 6a58dd0 · 6a58dd0
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diff --git a/src/com/betterzhang/learnkotlin/java/Outer.java b/src/com/betterzhang/learnkotlin/java/Outer.java
@@ -0,0 +1,32 @@
+package com.betterzhang.learnkotlin.java;
+
+/**
+ * Created by IntelliJ IDEA.
+ * Author : Andrew Zhang
+ * Email  : betterzhang.dev@gmail.com
+ * Time   : 2017/06/28 上午 10:42
+ * Desc   : 静态与非静态内部类
+ */
+public final class Outer {
+
+    private int bar = 100;
+
+    public static class Nested {
+        public final String foo() {
+            return "Hello Java";
+        }
+    }
+
+    public final class Inner {
+        public final int foo() {
+            return bar;     // 可以访问外部类成员
+        }
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new Outer.Nested().foo());
+        System.out.println(new Nested().foo());
+//        System.out.println(new Outer().Inner().foo());    // 不能在其他类中实例化非静态内部类
+    }
+
+}
diff --git a/src/com/betterzhang/learnkotlin/kotlin/Outer.kt b/src/com/betterzhang/learnkotlin/kotlin/Outer.kt
@@ -0,0 +1,31 @@
+package com.betterzhang.learnkotlin.kotlin
+
+/**
+ * Created by IntelliJ IDEA.
+ * Author : Andrew Zhang
+ * Email  : betterzhang.dev@gmail.com
+ * Time   : 2017/06/28 上午 10:50
+ * Desc   : description
+ */
+class Outer {
+
+    private var bar: Int = 100
+
+    // 嵌套类
+    class Nested {
+        // 不能访问外部类成员
+        fun foo() = "Hello Kotlin"
+    }
+
+    // 内部类
+    inner class Inner {
+        // 可以访问外部类成员
+        fun foo() = bar
+    }
+
+}
+
+fun main(args: Array<String>) {
+    println(Outer.Nested().foo())
+    println(Outer().Inner().foo())
+}