자바

java.io.OutputStream -> Object // 추상 클래스

.close()

.write()

java.io.InputStream -> Object // 추상 클래스

.close()

.read()

java.io.FileOutputStream -> OutputStream

java.io.FileInputStream -> InputStream

java.io.ByteArrayOutputStream

java.io.ByteArrayInputStream -> java.io.InputStream

java.io.PipedInputStream

java.io.PipedOutputStream

import java.io.*;

class FileCopy01 {

  final static int BUFFER_SIZE = 256;

  public static void main(String[] args) {

    int i;

    byte[] buffer = new byte[BUFFER_SIZE];

    if(args.length < 2) {

      System.out.println("USAGE:FileCopy01 Source_file Destination_file");

      System.exit(-1);

   }

   try {

      InputStream  fis  = new FileInputStream(new File(args[0]));

      OutputStream fos = new FileOutputStream(new File(args[1]));

      InputStream bis = new BufferedInputStream(fis);

      OutputStream  bos = new BufferedOutputStream(fos, BUFFER_SIZE);

      while((i=bis.read(buffer)) != -1) { 

        bos.write(buffer, 0, i);

//        bos.flush();

      }

bis.close();

bos.close();

    }

   catch(FileNotFoundException e) {

      ..

    }

   catch(IOException e) {

      ..

    }

  }

}

import java.io.*;

class FileCopy {

  public static void main(String[] args) {

    int data;

    if(args.length < 2) {

      System.out.println("USAGE: FileCopy  Source_file  Destination_file");

      System.exit(-1);

    }

    try {

      InputStream fis = new FileInputStream(new File(args[0])); 

      OutputStream fos = new FileOutputStream(new File(args[1]));   

      while((data=fis.read()) != -1) {

        fos.write(data);

      }

      fis.close();

      fos.close();

    }catch(FileNotFoundException e) {

      ..

    }catch(IOException e) {

      ..

    }

  }

}                                                                                       

java.io.BufferedOutputStream -> FilterOutputStream

.flush()

java.io.BufferedInputStream -> FilterInputStream

.available()

java.io.DataOutputStream -> FilterInputStream

.writeChar()

.writeUTF()

.writeByte()

.writeShort()

.writeInt()

.writeFloat()

.writeDouble()

java.io.DataInputStream -> FilterInputStream

.readChar()

.readUTF()

.readByte()

.readFully()

.readDouble()

java.io.PrintStream -> FilterOutputStream

.print()

.println()

.printf() // 자바 5.0

ObjectOutput // 인터페이스

.writeObject()

ObjectInput // 인터페이스

.readObject()

Externalizable

.writeExternal()

.readExternal()

java.io.ObjectOutputStream

.close()

.writeObject()

.flush()

java.io.ObjectInputStream

A serialization stream header is read from the stream and verified. This constructor will block until the corresponding ObjectOutputStream has written and flushed the header.

.close()

.readObject()

import  java.io.*;

class Customer  implements Externalizable{

    int ID;

    String name ;

    int age;

    double height;

    public Customer( ) { }

    public Customer(int ID, String name, int age, double height){

      this.ID       = ID;

      this.name  = name;

      this.age     = age; 

      this.height = height;

    }

    public void writeExternal(ObjectOutput oos) throws IOException{

      oos.writeObject(new Integer(ID));

      oos.writeObject(name);

      oos.writeObject(new Integer(age));

      oos.writeObject(new Double(height));

    }

    public void readExternal(ObjectInput  ois) throws  ClassNotFoundException, IOException{ 

      ID =(Integer)ois.readObject(); 

      name=(String)ois.readObject();

      age=(Integer)ois.readObject();

      height=(Double)ois.readObject();

    }

   

    public String  toString(){

      String temp;

      temp = ID + "\t " + name + "\t " + age + "\t " + height;

      return temp;

    }

}

import java.io.*;

class ObjectStreamTest05{

  public static void main(String[] args) {

    Customer cus=new Customer(2, "..", 9, 130);

    try{

      ..

      OutputStream fos=new FileOutputStream("...") ;

      ObjectOutputStream oos=new ObjectOutputStream(fos) ;

      oos.writeObject(cus);

      oos.close();

      fos.close();

    }catch(IOException e){

      e.printStackTrace();

    }

  }

}

import java.io.*;

class ObjectStreamTest06{

  public static void main(String[] args) {

    try{

      InputStream fis=new FileInputStream("...") ;

      ObjectInputStream ois=new ObjectInputStream(fis) ;

      Customer cus=(Customer)ois.readObject( );

      ..

      ois.close();

      fis.close();

    }catch(ClassNotFoundException ce){

      ce.printStackTrace();

    }

    catch(IOException ie){

      ie.printStackTrace();

    }

  }

}

java.io.Reader // abstract

.close()

java.io.InputStreamReader -> Reader

java.io.FileReader -> InputStreamReader

java.io.BufferedReader -> Reader

.close()

.readLine()

java.io.OutputStreamWriter -> Writer

java.io.FileWriter -> OutputStreamWriter

java.io.BufferedWriter -> Writer

java.io.PrintWriter -> Writer

.close()

.println()

System.out // static; java.io.PrintStream

.print()

.println()

.printf() // 자바 5.0

System.in // static; InputStream

.read()

System.err // static

.println();

참조 사이트:

https://docs.oracle.com/javase/8/docs/technotes/guides/lang/resources.html