JAVA 11.4 PrintWriter 11.5

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1 JAVA 11.4 PrintWriter 11.5

2 PrintWriter Writer Int, float, char Object print() println() tostring()

3 PrintWriter PrintWriter(OutputStream outputstream) PrintWriter(OutputStream outputstream, boolean flushonnewline) PrintWriter(Writer writer) PrintWriter(Writer writer, boolean flushonnewline) flushonnewline

4 PrintWriter (1/2) Import java.io.*; Class PrintWirterDemo{ public static void main(string args[]){ try { PrintWriter pw = new PrintWriter(System.out); pw.println(true); // pw.println( A ); pw.println(500); pw.println(40000l); pw.println(45.67f);

5 PrintWriter (2/2) } pw.println(45.67); pw.println( Hello ); pw.println(new Integer( 99 )); pw.close(); // } catch (Exception e){ System.out.println( Exception: + e); } }

6 pw.println(true); true pw.println( A ); A pw.println(500); 500 pw.println(40000l); pw.println(45.67f); pw.println(45.67); pw.println( Hello ); Hello pw.println(new Integer( 99 )); 99

8 OutputStream OutputStream

9 FileOutputStream FileOutputStream(String filepath) throws IOException FileOutputStream(String filepath, boolean append) throws IOException FileOutputStream(File fileobj) throws IOException filepath: fileobj: File Append {

10 FilterOutputStream FilterOutputStream(OutputStream os) os OutputStream FilterOutputStream

11 BufferedOutputStream BufferedOutputStream(OutputStream os) BufferedOutputStream(OutputStream os, int bufsize) FilterOutputStream bufsize

12 DataOutputStream DataOutputStream(OutputStream os) FilterOutputStream DataOutput

13 DataOutput (1/2)

14 DataOutput (2/2)

15 PrintStream PrintStream(OutputStream outputstream) PrintStream(OutputStream outputstream, boolean flushonnewline) PrintStream(OutputStream outputstream, String encoding) FilterOutputStream System.out

16 InputStream InputStream

17 FileInputStream FileInputStream(String filepath) throws FileNotFoundException FileInputStream(File fileobj) throws FileNotFoundException filepath: fileobj: File InputStream

18 FilterInputStream FilterInputStream(InputStream is) is: InputStream FilterInputStream

19 BufferedInputStream BufferedInputStream(InputStream is) BufferedInputStream(InputStream is, int bufsize) FilterInputStream bufsize

20 DataInputStream DataInputStream(InputStream is) FilterInputStream DataInput Java

21 DataInput (1/2)

22 DataInput (2/2)

23 FileOutputStream Import java.io.*; Class FileOutputStreamDemo{ public static void main(string args[]){ try{ FileOutputStream fos = new FileOutputStream(args[]); for(int i=0; i<12; i++){ // fos.write(i); } fos.close(); } catch (Exception e){ System.out.println( Exception: + e);}}}

24 FileInputStream try{ FileInputStream fis = new FileInputStream(args[]); int i; } while((i = fis.read())!= -1){ // System.out.println(i); } fis.close(); catch (Exception e){ System.out.println( Exception: + e);

25 BufferedOutputStream try{ FileOutputStream fos = new FileOutputStream(args[0]); BufferedOutputStream bos = new BufferedOutputStream(fos); for(int i=0; i<12; i++){ // } bos.write(i); bos.close; catch{ } System.out.println( Exception: + e);

26 BufferedInputStream try{ FileInputStream fis = new FileInputStream(args[0]); BufferedInputStream bis = new BufferedInputStream(fis); int i; while((i = bis.read())!= -1){ System.out.println(i); } fis.close(); catch (Exception e){ System.out.Println( Exception: + e); }

27 DataOutputStream (1/2) try{ FileOutputStream fos = new FileOutputStream(args[0]); DataOutputStream dos = new DataOutputStream(fos); dos.writeboolean(false); dos.writebyte(byte.max_value); dos.writechar( A ); dos.writedouble(double.max_value); dos.writefloat(float.max_value); dos.writeint(integer.max_value); dos.writelong(long.max_value);

28 DataOutputStream (2/2) dos.writeshort(short.max_value); fos.close(); } catch (Exception e){ System.out.println( Exception: + e); }

29 DataInputStream (1/2) try{ FileInputStream fis = new FileInputStream(args[0]); DataInputStream dis = new DataInputStream(fis); System.out.println(dis.readBoolean()); System.out.println(dis.readByte()); System.out.println(dis.readChar()); System.out.println(dis.readDouble()); System.out.println(dis.readFloat()); System.out.println(dis.readInt()); System.out.println(dis.readLong());

30 DataInputStream (2/2) System.out.println(dis.readShort()); fis.close(); } catch (Exception e){ System.out.println( Exception: + e); }

31 (1/2) System.out.println(dis.readBoolean()); false System.out.println(dis.readByte()); 127 System.out.println(dis.readChar()); A System.out.println(dis.readDouble()); E308 System.out.println(dis.readFloat()); E38

32 (2/2) System.out.println(dis.readInt()); System.out.println(dis.readLong()); System.out.println(dis.readShort()); 32676

33 PrintWriter

PowerPoint Presentation

PowerPoint Presentation 独習 Java ゼミ 11.4 PrintWriter クラス 11.5 バイトストリーム 07/06/22 鈴木慧 11.4 PrintWriter クラス PrintWhiter クラスとは Writer を拡張したクラス int float char などの基本データ型およびオブジェクトと等価の文字列を表示する PrintWriter コンストラクタ PrintWriter(OutputStream