java中Properties有什么用，举例说明？

3.9 Properties的用法 

马克-to-win：Properties里面存着也是键值对，而且它更方便java对配置文件，字符串的操作，

例：3.9.1

import java.util.*;
public class TestMark_to_win {
    public static void main(String args[]) {
        Properties sala = new Properties();
        Set name;
        String str;
        sala.put("zs", "1111");
        sala.put("ls", "2222");
        sala.put("ww", "3333");
        sala.put("zl", "4444");

        // Show all name and sala in hashtable.
        name = sala.keySet(); // get set-view of keys
        Iterator itr = name.iterator();
        while (itr.hasNext()) {
            str = (String) itr.next();
            System.out.println("The sala of " +
            /* public String getProperty(String key)Searches for the property
             * with the specified key in this property list.*/
            str + " is " + sala.getProperty(str) + ".");
 
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