java中io流图解

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io流

字节流

InputStream

FileInputStream

概要

构造器

public FileInputStream(String name){}

public FileInputStream(File file){}

FilterInputStream

BufferedInputStream

概要

构造器

public BufferedInputStream(InputStream in){}

public BufferedInputStream(InputStream in, int size){}

成员变量

protected volatile byte buf[];

DataInputStream

概要

构造器

public DataInputStream(InputStream in){}

方法

readInt()、readShort().....

ByteArrayInputStream

概要

构造器

public ByteArrayInputStream(byte buf[]){}

public ByteArrayInputStream(byte buf[], int offset, int length){}

成员变量

protected byte buf[];

SequenceInputStream

概要

构造器

public SequenceInputStream(Enumeration<? extends InputStream> e){}

public SequenceInputStream(InputStream s1, InputStream s2){}

成员变量

Enumeration<? extends InputStream> e;

InputStream in;

ObjectInputStream

概要

构造器

public ObjectInputStream(InputStream in){}

方法

public final Object readObject(){}

OutputStream

FileOutputStream

概要

构造器

public FileOutputStream(String name){}

public FileOutputStream(String name, boolean append){}

public FileOutputStream(File file){}

public FileOutputStream(File file, boolean append){}

FilterOutputStream

BufferedOutputStream

概要

构造器

public BufferedOutputStream(OutputStream out){}

public BufferedOutputStream(OutputStream out, int size){}

成员变量

protected byte buf[];

DataOutputStream

概要

构造器

public DataOutputStream(OutputStream out){}

方法

writeInt().....

PrintStream

字节打印流，标准输出流的对象

概要

构造器

public PrintStream(OutputStream out){}

public PrintStream(OutputStream out, boolean autoFlush){}

public PrintStream(OutputStream out, boolean autoFlush, String encoding){}

public PrintStream(String fileName){this(false, new FileOutputStream(fileName));}

public PrintStream(File file){}

public PrintStream(File file, String csn){}

成员变量

private OutputStreamWriter charOut;

private BufferedWriter text

方法

print()

println()

ByteArrayOutputStream

概要

构造器

public ByteArrayOutputStream(){}

public ByteArrayOutputStream(int size){}

成员变量

protected byte buf[];

方法

public synchronized byte toByteArray()[] {return Arrays.copyOf(buf, count);}

ObjectOutputStream

概要

构造器

public ObjectOutputStream(OutputStream out) {}

方法

public final void writeObject(Object obj){}

字符流

Reader

InputStreamReader

概要

构造器

public InputStreamReader(InputStream in){}

public InputStreamReader(InputStream in, String charsetName){}

public InputStreamReader(InputStream in, Charset cs) {}

方法

public String getEncoding(){}

子类

FileReader

概要

构造器

super(new FileInputStream(...));

public FileReader(String fileName){}

public FileReader(File file){}

BufferedReader

概要

构造器

public BufferedReader(Reader in, int sz) {}

public BufferedReader(Reader in){}

方法

public String readLine(){}

成员变量

private Reader in;

private char cb[];

CharArrayReader

概要

构造器

public CharArrayReader(char buf[]){}

public CharArrayReader(char buf[], int offset, int length){}

成员变量

protected char buf[];

StringReader

概要

构造器

public StringReader(String s){}

成员变量

private String str;

Writer

OutputStreamWriter

概要

构造器

public OutputStreamWriter(OutputStream out, String charsetName){}

public OutputStreamWriter(OutputStream out) {}

public OutputStreamWriter(OutputStream out, Charset cs) {}

public FileOutputStream(File file, boolean append){}

方法

public String getEncoding(){}

子类

FileWriter

概要

构造器

super(new FileOutputStream(...))

public FileWriter(String fileName){}

public FileWriter(String fileName, boolean append){}

public FileWriter(File file) {}

public FileWriter(File file, boolean append){}

BufferedWriter

概要

构造器

public BufferedWriter(Writer out){}

public BufferedWriter(Writer out, int sz){}

子主题

方法

public void newLine(){}

成员变量

private Writer out;

private char cb[];

CharArrayWriter

概要

构造器

public CharArrayWriter(){}

public CharArrayWriter(int initialSize){}

成员变量

protected char buf[];

方法

public char toCharArray()[] {synchronized (lock) {return Arrays.copyOf(buf, count);}}

StringWriter

概要

构造器

public StringWriter() {buf = new StringBuffer();lock = buf;}

public StringWriter(int initialSize){}

成员变量

private StringBuffer buf;

方法

public StringBuffer getBuffer(){}

PrintWriter

字符打印流

概要

构造器

public PrintWriter (Writer out){}

public PrintWriter(OutputStream out){}

public PrintWriter(String fileName){}

public PrintWriter(File file){}

成员变量

protected Writer out;

方法

print()

println()

标准输入输出流

System.in

通常作为Scanner的对象

System.out

实则调用的是PrintStream的功能。为什么在控制台输出呢？是因为PrintStream printStream = new PrintStream(new FileOutputStream(FileDescriptor.out));