垃圾回收

src/chapter5/Example13.java

@@ -0,0 +1,28 @@
+package chapter5;
+
+class Person implements AutoCloseable {
+    String name;
+    public Person(String name) {
+        this.name = name;
+    }
+
+    public void close() {
+        System.out.println( name + " 要被回收啦！");
+    }
+}
+
+public class Example13 {
+    public static void main(String[] args) {
+        Person p1 = new Person("小明");
+        Person p2 = new Person("大王");
+
+        p1 = null;
+        p2 = null;
+
+        System.gc();
+
+        for (int i = 0; i < 1000000; i ++) {
+            // 为了延长程序运行的时间
+        }
+    }
+}

src/chapter5/Example14.java

@@ -0,0 +1,4 @@
+package chapter5;
+
+public class Example14 {
+}