Java map Properties

一、特点

1、key value键值对

2、无序，无索引

3、线程安全

4、key value 默认 String类型

二、方法

1、map通用方法

2、特有方法

// 1.增  setProperty(key, values)  
// 2.获取  getProperty(key)
// 3.获取keys stringPropertyNames()

3、案例

package com.wt.map;

import java.util.Properties;
import java.util.Set;

public class Demon04 {
    public static void main(String[] args) {
        Properties properties = new Properties();
        // 1.增 setProperty(key, values)
        properties.setProperty("name", "小新");
        properties.setProperty("father", "广智");
        System.out.println("properties = " + properties);
        // 2.获取 getProperty(key)
        String name = properties.getProperty("name");
        System.out.println("name = " + name);
        // 3.获取 keys stringPropertyNames()
        Set<String> strings = properties.stringPropertyNames();
        for (String string : strings) {
            String property = properties.getProperty(string);
            System.out.println("property = " + property);
        }
    }
}