一个cool Map

最新推荐文章于 2024-03-13 21:39:58 发布

原创最新推荐文章于 2024-03-13 21:39:58 发布 · 1.5k 阅读

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本文介绍了一个名为QuickMap的实用类，它通过扩展HashMap提供了一种简洁的方式来进行键值对的存储。QuickMap支持多种方式添加键值对，并提供了便捷的方法进行操作。

备份一个很cool的map：

import java.util.HashMap; /** * Shortcut Map by extending HashMap. * You can use it as below: * map.put("country", "China", "city", "wuhan"); * or * new QuickMap("country", "China", "city", "wuhan") * or * map.add("country", "China").add("city", "wuhan"); * * ablow is the same as old style: * map.put("country", "Chian") * map.put("city", "wuhan"); * * @author lichun * */ public class QuickMap extends HashMap<String, Object> { private static final long serialVersionUID = 1L; public QuickMap() {} /** * * @param args */ public QuickMap(Object... args) { put(args); } /** * shortcut method for put key-value in map. * * @param args key-vlaue objects, the firt is key , the second is * value, and so on. * @date Apr 22, 2009 * @auther Lichun * @see */ public void put(Object... args) { for (int i = 1; i < args.length; i += 2) { put(String.valueOf(args[i - 1]), args[i]); } } /** * shortcut method * @param key key in map * @param value value in map * @return a QuickMap instance , you can add next key-value. * @date Apr 22, 2009 * @auther Lichun * @see */ public QuickMap add(String key, Object value) { this.put(key, value); return this; } }

用法及testcase：

public class QuickMapTest extends TestCase { public void testPut1() { QuickMap map = new QuickMap(); map.put("firstName", "li", "lastName", "chunlei"); String firstName = (String)map.get("firstName"); assertTrue(firstName.equals("li")); String lastName = (String)map.get("lastName"); assertTrue(lastName.equals("chunlei")); } public void testPut2() { QuickMap map = new QuickMap(); map.put("firstName", "li", "lastName", "chunlei", "age"); String firstName = (String)map.get("firstName"); assertTrue(firstName.equals("li")); String lastName = (String)map.get("lastName"); assertTrue(lastName.equals("chunlei")); assertNull(map.get("age")); } public void testAdd() { QuickMap map = new QuickMap(); map.add("firstName", "li").add("lastName", "chunlei").add("age", 88); String firstName = (String)map.get("firstName"); assertTrue(firstName.equals("li")); String lastName = (String)map.get("lastName"); assertTrue(lastName.equals("chunlei")); int age = (Integer)map.get("age"); assertTrue(age == 88); } }