Java 中的 Java.io.DataInputStream 类|集合 2
原文:https://www . geesforgeks . org/Java-io-datainputstream-class-Java-set-2/
Java 中的 Java.io.DataInputStream 类|集合 1
更多方法:
-
byte readbyte (): Reads and returns an input byte.
```java Syntax:public final byte readByte() throws IOException Returns: the next byte of this input stream as a signed 8-bit byte. Throws: EOFException IOException
```
-
float read float (): Read four input bytes and return a floating point value.
java Syntax:public final float readFloat() throws IOException Returns :the next four bytes of this input stream, interpreted as a float. Throws: EOFException IOException -
[T1】 void readFully (byte [] b): Read some bytes from the input stream and store them in buffer array B.
java Syntax:public final void readFully(byte[] b) throws IOException Parameters: b - the buffer into which the data is read. Throws: EOFException IOException -
[T1】 void readFully (byte [] b, int off, int len): Read len bytes from the input stream.
java Syntax:public final void readFully(byte[] b, int off, int len) throws IOException Parameters: b - the buffer into which the data is read. off - the start offset of the data. len - the number of bytes to read. Throws: EOFException IOException -
String readline (): Read the next line of text from the input stream.
```java Syntax: Returns: the next line of text from this input stream. Throws: IOException Deprecated This method does not properly convert bytes to characters.
```
-
Long readLong(): Read 8 input bytes and return a long value.
java Syntax:public final long readLong() throws IOException Returns: the next eight bytes of this input stream, interpreted as a long. Throws: EOFException IOException -
Short read short (): Read two input bytes and return a short value.
java Syntax:public final short readShort() throws IOException Returns: the next two bytes of this input stream, interpreted as a signed 16-bit number. Throws: EOFException IOException -
String read UTF (): Read the string encoded in the modified UTF-8 format.
```java Syntax:public final String readUTF() throws IOException Returns: a Unicode string. Throws: EOFException IOException UTFDataFormatException
```
-
int skip bytes (int n): Try to skip n bytes of data in the input stream and discard the skipped bytes.
java Syntax:public final int skipBytes(int n) throws IOException Parameters: n - the number of bytes to be skipped. Returns: the actual number of bytes skipped. Throws: IOException
节目 2:
//Java program to demonstrate DataInputStream
// This program uses try-with-resources. It requires JDK 7 or later.
import java.io.*;
import java.lang.reflect.Array;
import java.util.Arrays;
class DataInputStreamDemo
{
public static void main(String args[]) throws IOException
{
//writing the data.
try ( DataOutputStream dout =
new DataOutputStream(new FileOutputStream("file.dat")) )
{
dout.writeBytes("1");
dout.writeFloat(4.4545f);
dout.writeUTF("geeksforgeeks");
dout.writeChars("GeeksforGeeks\n");
dout.writeBytes("ABCDEFG");
}
catch(FileNotFoundException ex)
{
System.out.println("Cannot Open the Output File");
return;
}
// reading the data back.
try ( DataInputStream din =
new DataInputStream(new FileInputStream("file.dat")) )
{
//illustrating readByte() method
byte t=din.readByte();
//illustrating readFloat() method
float u=din.readFloat();
//illustrating readUTF() method
String temp=din.readUTF();
//illustrating readLine() method
String temp1=din.readLine();
System.out.println("Values: " + t +" "+" "+u+" "+temp+" "+temp1 );
//illustrating skipBytes() method
//skipping "AB"
din.skipBytes(2);
//illustrating readFully() method
byte[] b=new byte[4];
din.readFully(b,0,4);
System.out.println(Arrays.toString(b));
}
catch(FileNotFoundException e)
{
System.out.println("Cannot Open the Input File");
return;
}
}
}
输出:
Values: 49 4.4545 geeksforgeeks GeeksforGeeks
[67, 68, 69, 70]
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