1 /*
2 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang.management;
27
28 /**
29 * Types of {@link MemoryPoolMXBean memory pools}.
30 *
31 * @author Mandy Chung
32 * @since 1.5
33 */
34 public enum MemoryType {
35
36 /**
37 * Heap memory type.
38 * <p>
39 * The Java virtual machine has a <i>heap</i>
40 * that is the runtime data area from which
41 * memory for all class instances and arrays are allocated.
42 */
43 HEAP("Heap memory"),
44
45 /**
46 * Non-heap memory type.
47 * <p>
48 * The Java virtual machine manages memory other than the heap
49 * (referred as <i>non-heap memory</i>). The non-heap memory includes
50 * the <i>method area</i> and memory required for the internal
51 * processing or optimization for the Java virtual machine.
52 * It stores per-class structures such as a runtime
53 * constant pool, field and method data, and the code for
54 * methods and constructors.
55 */
56 NON_HEAP("Non-heap memory");
57
58 private final String description;
59
60 private MemoryType(String s) {
61 this.description = s;
62 }
63
64 /**
65 * Returns the string representation of this {@code MemoryType}.
66 * @return the string representation of this {@code MemoryType}.
67 */
68 public String toString() {
69 return description;
70 }
71
72 private static final long serialVersionUID = 6992337162326171013L;
73 }
74