java:IO流(Properties的特殊功能使用)

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package com.heima.otheio;

import java.util.Enumeration;
import java.util.Properties;

public class Demo6_Properties {
	
	public static void main(String[] args) {
		Properties prop=new Properties();//properties是hashtable的子类
		prop.put("abc", "123");
		
		Enumeration<String> en=(Enumeration<String>) prop.propertyNames();
		while(en.hasMoreElements()) {
			String key=en.nextElement();
			String value=prop.getProperty(key);
			System.out.println(key+"="+value);
		}
		System.out.println(prop);	//默认调用了tostring方法

	}

}