Properties作为集合的特有方法练习

public class PropertiesDemo02 {
    public static void main(String[] args) {
        //Object setProperty(String key, String value)  设置集合的键和值，都是String类型，底层调用时HashTable
        Properties prop = new Properties();
        prop.setProperty("001","设置第1个元素");
        /*
            Object setProperty(String key, String value) {
                return put(key, value);
            }

            Object put(Object key, Object value) {
                return map.put(key, value);
            }
         */
        prop.setProperty("002","设置第2个元素");
        prop.setProperty("003","设置第3个元素");

        System.out.println(prop);
    }
}

public class PropertiesDemo02 {
    public static void main(String[] args) {
        //Object setProperty(String key, String value)  设置集合的键和值，都是String类型，底层调用时HashTable
        Properties prop = new Properties();
        prop.setProperty("001","设置第1个元素");
        /*
            Object setProperty(String key, String value) {
                return put(key, value);
            }

            Object put(Object key, Object value) {
                return map.put(key, value);
            }
         */
        prop.setProperty("002","设置第2个元素");
        prop.setProperty("003","设置第3个元素");


        //String getProperty(String key) 使用此属性列表中指定的键搜索属性。
        System.out.println(prop.getProperty("001"));
        System.out.println(prop.getProperty("0001"));

        System.out.println(prop);
    }
}

public class PropertiesDemo02 {
    public static void main(String[] args) {
        //Object setProperty(String key, String value)  设置集合的键和值，都是String类型，底层调用时HashTable
        Properties prop = new Properties();
        prop.setProperty("001","设置第1个元素");
        /*
            Object setProperty(String key, String value) {
                return put(key, value);
            }

            Object put(Object key, Object value) {
                return map.put(key, value);
            }
         */
        prop.setProperty("002","设置第2个元素");
        prop.setProperty("003","设置第3个元素");

        //Set<String> stringPropertyNames() 返回此属性列表中的一组键，其中键及其对应的值为字符串。
        Set<String> names = prop.stringPropertyNames();
        for (String key : names){
            String value = prop.getProperty(key);
            System.out.println(key+","+value);
        }

    }
}