import java.io.*;

public class Exam_05 {

public static void main(String[] args) throws IOException {

FileOutputStream fos1 = new FileOutputStream(FileDescriptor.out);

File f = new File("aaa.txt");
FileOutputStream fos2 = new FileOutputStream(f);

byte [] by = new byte[]{'H', 'e', 'l', 'l', 'o', ' ', 'J', 'a', 'v', 'a'};

// System.out.println("Hello Java");
fos1.write(by);
fos2.write(by);
fos2.flush();

fos1.close();
fos2.close();
}

}

import java.io.*;

public class Exam_06 {

public static void main(String ... arg) throws IOException {
FileOutputStream fos1 = new FileOutputStream(new File("bbb.txt"), false);
BufferedOutputStream bos1 = new BufferedOutputStream(fos1);
DataOutputStream dos1 = new DataOutputStream(bos1);

dos1.writeInt(20);
dos1.writeDouble(12.34);
dos1.flush();

dos1.writeChar('A');
dos1.writeByte('\n');
dos1.writeByte('B');

dos1.close();
}
}

import java.io.*;

public class Exam_07 {

public static void main(String[] args) throws IOException {

FileInputStream fis1 = new FileInputStream(FileDescriptor.in);

System.out.print("문자 : ");
char ch = (char)fis1.read();
System.in.read();     // Enter나 마찬가지(문자를 입력을 끝내겠다는 뜻)

System.out.print("문자열 : ");
byte [] by = new byte[1024];
fis1.read(by);

System.out.printf("\nch : %c\nby : %s", ch, new String(by).trim());
fis1.close();
}

}

import java.io.*;

public class Exam_07_1 {

public static void main(String[] args) throws IOException {

FileInputStream fis2 = new FileInputStream(new File("aaa.txt"));

int x = -1;

while((x = fis2.read()) != -1)
  System.out.print((char)x);

fis2.close();
}

}

import java.io.*;

public class Exam_08 {

public static void main(String[] args) throws IOException {

// 그냥 장난 쳐본거~!
DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File("bbb.txt"))));

int a = dis.readInt();
double b = dis.readDouble();
char c = dis.readChar();
byte d = dis.readByte();
byte e= dis.readByte();
dis.close();

System.out.printf("a = %d\nb = %f\nc = %c\nd = %d\ne = %c", a, b, c, d, (char)e);

}

}

import java.io.*;

public class Exam_08_1 {

public static void main(String[] args) throws IOException {

// 그냥 장난 쳐본거~!
DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File("bbb.txt"))));

int x = -1;
while((x = dis.read()) != -1)
  System.out.print((char)x);

dis.close();
}

}

import java.io.*;

public class Exam_09 {

public static void main(String[] args) throws IOException {
 
 OutputStreamWriter osw = new OutputStreamWriter(System.out);
 BufferedWriter bw = new BufferedWriter(osw);
 PrintWriter pw = new PrintWriter(bw);
 
 pw.println(10);
 pw.println("test 안녕하세요~");
 
 pw.close();  
}

}