OutputStreamWriter与InputStreamReader（转换流）的编码解码

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

public class TransStreamDemo {

    public static void main(String[] args) throws IOException {
        writerText_1();
        //writerText_2();
        //Reader_1();
        //Reader_2();
        
    }

    public static void Reader_2() throws IOException {
        InputStreamReader isr = new InputStreamReader(new FileInputStream("F:\\gbk_1.java"),"utf-8");
        int ch = 0;
        while((ch=isr.read())!=-1){
            System.out.print((char)ch);
        }
    }

    public static void Reader_1() throws IOException {
        FileReader fr = new FileReader("F:\\gbk_1.java");
        int ch = 0;
        while((ch=fr.read())!=-1){
            System.out.print((char)ch);
        }
        
    }

    public static void writerText_2() throws IOException {
        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("F:\\gbk_2.java"),"utf-8");//转换流可以指定编码表
        osw.write("你好");
        osw.close();
    }

    public static void writerText_1() throws IOException {
        FileWriter fw = new FileWriter("F:\\gbk_1.java");//编码表固定的
        
        fw.write("你好");
        fw.flush();
        fw.close();
    }
}