流的关闭

import java.io.Closeable;
import java.io.IOException;

/**
 * 工具类关闭流
 * 可变参数：... 只能形参最后一个位置，处理方式与数组一致
 */
public class FileUtil01 {
    public static void close(Closeable ...io){
        for(Closeable temp:io){
            if(null!=temp){
                try {
                    temp.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    //使用泛型
    public static <T extends Closeable> void closeAll(T...io){
        for(Closeable temp:io){
            if(null!=temp){
                try {
                    temp.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

jdk1.7新特性：try-with-resource

import java.io.*;

/**
 * 转换流：字节转为字符
 * 1、输出流OutputStreamWriter 编码
 * 2、输入流InputStreamReader  解码
 * try-with-resource  jdk1.7新特性
 */
public class Demo05 {
    public static void main(String[] args) throws IOException {
        //文件的解码
        try(
        BufferedReader reader=new BufferedReader(
                new InputStreamReader(
                new FileInputStream(new File("D:/EnumMap12.java")),"UTF-8"));//文件以UTF-8格式解码
        //文件的编码
        BufferedWriter writer=new BufferedWriter(
                new OutputStreamWriter(
                        new FileOutputStream(new File("D:/EnumMap13.java")),"GBK"
                )//将文件以GBK格式编码
        );) {
            String info = null;
            while (null != (info = reader.readLine())) {
                writer.write(info + "\n");
                System.out.println(info);
            }
        }


    }
}