Java---IO流内存流

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package cn.hncu.io.array;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;




/*
 * ★字节数组流
 ByteArrayInputStream与ByteArrayOutputStream
 ★字符数组流
 CharArrayReader与CharArrayWriter
 ★字符串流
 StringReader 与 StringWriter


 1、用于操作字节数组的流对象，其实它们就是对应设备为内存的流对象。 
 2、该流的关闭是无效的，因为没有调用过系统资源。
 3、按照流的读写思想操作数组中元素。 

 */
public class XxxArrayXxputStream {
    public static void main(String[] args) {
        //byteArrayXxxStream();
        //charArrayXxx();
        stringXxx();
    }

    private static void stringXxx() {
        StringReader sr = new StringReader("我是字符串流的演示...");
        StringWriter sw = new StringWriter();
        int ch = 0;
        try {
            while((ch=sr.read())!=-1){
                sw.write(ch);//每次读取一个字符写到输出流当中去
            }

            System.out.println(sw.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void charArrayXxx() {
        String strLine = "字符内存流的演示he he da!";
        char[] buf = strLine.toCharArray();
        CharArrayReader car = new CharArrayReader(buf);
        CharArrayWriter caw = new CharArrayWriter();
        int ch = 0;
        try {
            while((ch=car.read())!=-1){//每次从buf数组中去读数据,读到-1时代表数据已经被读完
                caw.write(ch);
            }

            System.out.println(caw.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            car.close();
            caw.close();
        }
    }

    private static void byteArrayXxxStream() {
        //操纵对象--给的字符串
        String strLine = "我是用来演示的字符串ni hao a!";
        byte[] buf = strLine.getBytes();//拿到字节数组
        ByteArrayInputStream bin = new ByteArrayInputStream(buf);
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        int ch = 0;
        while((ch=bin.read())!=-1){
            bout.write(ch);//将读取的内存流中的内容全部写到输出的内存流当中去
        }
        System.out.println(bout.toString());//输出
    }
}