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‎README.md‎

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Java核心技术学习代码兼测试案例<br>
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- test目录(测试包名与src目录保持一致)<br>
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对应学习代码包的详细测试案例<br>
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本人根据得到的启发给各个模块评级 * 一般 ** 有点意思 *** 棒
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包目录：
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- [ ] ├── org.rpc // 基于Java动态代理&Socket的简单RPC实现
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=================华丽的分割线=================
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- [ ] ├── org.javacore.base // Java基础必备
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- [ ] ├── org.javacore.collection // Java集合
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- [ ] ├── org.javacore.collection.list // Java集合List
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- [ ] ├── org.javacore.collection.map // Java集合Map
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- [ ] ├── org.javacore.collection.queue // Java集合Queue
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- [ ] ├── org.javacore.collection.set // Java集合Set
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- [ ] ├── org.javacore.collection.util // Java集合工具类
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- [x] ├── org.javacore.base // Java基础必备(**)
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- [x] ├── org.javacore.collection // Java集合(*)
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- [x] ├── org.javacore.collection.list // Java集合List(*)
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- [x] ├── org.javacore.collection.map // Java集合Map(*)
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- [x] ├── org.javacore.collection.queue // Java集合Queue(*)
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- [x] ├── org.javacore.collection.set // Java集合Set(*)
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- [x] ├── org.javacore.collection.util // Java集合工具类(**)
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- [ ] ├── org.javacore.initAndCleanup // Java初始化及清理
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- [ ] ├── org.javacore.io // Java IO
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- [ ] ├── org.javacore.io.byteoper // Java IO 字节操作

‎src/main/java/org/javacore/base/String/StringT2.java‎

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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -24,13 +24,19 @@ public class StringT2 {
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public static void main(String[] args) {
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StringObject sb = new StringObject();
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sb.setName("123");
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change(sb);
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System.out.println(sb.getName());
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change(sb, sb);
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System.out.println(sb.getName()); //结果为 234
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}
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public static void change(StringObject sb) {
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sb = new StringObject();
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sb.setName("456");
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public static void change(StringObject sb1, StringObject sb2) {
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/**
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* 在这里可以看出对象作为方法传递，只是传递该对象的一个引用，相当于指针
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* sb1指向了一个新申请的对象
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* sb2引用没有变，只是修改了对象的name属性
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*/
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sb1 = new StringObject();
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sb1.setName("456");
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sb2.setName("234");
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}
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}
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public void setName(String name) {
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this.name = name;
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}
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}
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}

‎src/main/java/org/javacore/base/copy/CopyT.java‎

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@@ -121,7 +121,8 @@ protected Object clone() throws CloneNotSupportedException {
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* java的引用类型都是存储在堆上的。
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* 然后开始说这份代码说的内容
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* 1. 浅拷贝： 只是将调用该方法的对象另复制一份，使用一段新的内存来存放，
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* 但是在这个类里面类级别的属性还是引用
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* 但是在这个对象里面类级别的属性还是引用
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* 2. 深拷贝： 克隆该对象后再克隆对象所引用的类级别的属性，重新引用这些属性
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*
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*/
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public class CopyT {

‎src/main/java/org/javacore/base/inter/ApplyClass.java‎

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}
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}
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/**
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* 不使用接口的话，就要用子类继承父类的方法来实现
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*/
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public class ApplyClass {
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public static void process(Processor p , Object input){
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System.out.println("调用对象名：" + p.name());

‎src/main/java/org/javacore/base/inter/ApplyInter.java‎

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}
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}
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/**
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* 虽然代码看起来和不用接口实现的类似，
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* 但是一个Java类只能继承一个父类，但可以实现多个接口
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*/
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public class ApplyInter {
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public static void process(ProcessorInter p , Object input){
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System.out.println("调用对象名：" + p.name());

‎src/main/java/org/javacore/collection/PerBtwnAllCollectionsT.java‎

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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* @since 2015-6-17 23:32:30
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* 各集合添加元素性能对比
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*/
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/**
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* 1. 了解常见集合，多种遍历方法
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* 2. 了解性能和线程安全问题
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* 3. 实现compare函数来排序
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*
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* 查看util包下的
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* 排序${@link org.javacore.collection.util.CollectionsT}
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* Iterator与ListIterator的区别${@link org.javacore.collection.util.IterAndListIterT}
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* Mao性能对比${@link org.javacore.collection.util.PerBtwnEmptyMapAndHashMapT}
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*/
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@SuppressWarnings("unchecked")
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public class PerBtwnAllCollectionsT{
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public static void main(String[] args){
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// List Add对比
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printLists();
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a1.add("Map");
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System.out.println("ArrayList Elements:");
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System.out.print("\t" + a1 + "\n");
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List<String> l1 = new LinkedList<String>();
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l1.add("List");
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l1.add("Set");
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System.out.println("LinkedList Elements:");
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System.out.print("\t" + l1 + "\n");
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}
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/**
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* 比较Set的Add方法:注意元素的位置
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*/
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h1.add("Map");
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System.out.println("HashSet Elements:");
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System.out.print("\t" + h1 + "\n");
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Set t1 = new TreeSet<String>();
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t1.add("List");
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t1.add("Set");
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System.out.println("TreeSet Elements:");
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System.out.print("\t" + t1 + "\n");
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}
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/**
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* 比较Map的put方法:注意元素的位置
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*/
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h1.put("Map", "HashMap");
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System.out.println("HashMap Elements:");
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System.out.print("\t" + h1 + "\n");
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Map<String, String> t1 = new TreeMap<String,String>();
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t1.put("List", "ArrayList");
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t1.put("Set", "HashSet");
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t1.put("Queue", "PriorityQueue");
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t1.put("Map", "HashMap");
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System.out.println("TreeMap Elements:");
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System.out.print("\t" + t1 + "\n");
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}
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}

‎src/main/java/org/javacore/collection/hash/HashList.java‎

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skuObj.setDesc("descexist" + i);
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existSkuObjList.add(skuObj);
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}
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}
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}

‎src/main/java/org/javacore/collection/util/IterAndListIterT.java‎

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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* Iterator与ListIterator的区别
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*/
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public class IterAndListIterT {
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public static void main(String[] args) {
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//iterator();
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// iterator();
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listIterator();
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}
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/**
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* 并发修改异常产生。
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* 原因：Iterator(Object obj = it.next()) 会检查HashMap的size，
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a1.add("List02");
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a1.add("List04");
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a1.add("List05");
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Iterator i1 = a1.iterator();
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while (i1.hasNext()){
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Object obj = i1.next();
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if (obj.equals("List02"))
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a1.add("List03");
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}
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System.out.print("集合：\n\t"+a1+"\n");
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}
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/**
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*/
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a1.add("List");
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a1.add("List03");
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a1.add("List04");
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ListIterator l1 = a1.listIterator();
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while (l1.hasNext()){
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Object obj = l1.next();

‎src/main/java/org/javacore/collection/util/PerBtwnEmptyMapAndHashMapT.java‎

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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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public class PerBtwnEmptyMapAndHashMapT {
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@SuppressWarnings({"unused", "rawtypes"})
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public static void main(String[] args) {
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// nanoTime() 输出的精度是纳秒ns级别
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long startTime = System.nanoTime();
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long endTime;
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long duration;
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long duration;
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for (int i = 0; i < 100000000; i++) {
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Map map = Collections.EMPTY_MAP;
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}
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endTime = System.nanoTime();
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duration = endTime - startTime;
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System.out.println("Collections.EMPTY_MAP: " + duration);
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startTime = System.nanoTime();
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for (int i = 0; i < 100000000; i++) {
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Map map = new HashMap<>();

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