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Java ByteBuffer put()方法用法及代码示例


put(byte b)

java.nio.ByteBuffer类的put(byte b)方法用于将给定字节写入当前位置的新创建的字节缓冲区中，然后递增该位置。

用法:

public abstract ByteBuffer put(byte f)

参数：该方法将字节值b作为要写入字节缓冲区的参数。



返回值：此方法返回此缓冲区，在其中插入字节值。

异常：此方法引发以下异常：

  • BufferOverflowException-如果此缓冲区的当前位置不小于其限制
  • ReadOnlyBufferException-如果此缓冲区是只读的

下面是说明put(byte b)方法的示例：

范例1：

// Java program to demonstrate 
// put() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 3; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer using put() method 
            bb.put((byte)10) 
                .put((byte)20) 
                .put((byte)30) 
                .rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer:  "
                               + Arrays.toString(bb.array())); 
        } 
  
        catch (BufferOverflowException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Original ByteBuffer: [10, 20, 30]

范例2：演示BufferOverflowException。

// Java program to demonstrate 
// put() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 3; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer using put() method 
            bb.put((byte)10) 
                .put((byte)20) 
                .put((byte)30); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer:  "
                               + Arrays.toString(bb.array())); 
  
            // again putting the value in ByteBuffer 
            // using put() method 
            System.out.println("\nBuffer position:"
                               + bb.position()); 
            bb.put((byte)40); 
        } 
  
        catch (BufferOverflowException e) { 
  
            System.out.println("buffer's current position "
                               + "is not smaller than its limit"); 
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Original ByteBuffer: [10, 20, 30]

Buffer position:3
buffer's current position is not smaller than its limit
Exception throws:java.nio.BufferOverflowException

范例3：演示ReadOnlyBufferException。

// Java program to demonstrate 
// put() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 3; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer using put() method 
            bb.put((byte)10) 
                .put((byte)20) 
                .put((byte)30); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer:  "
                               + Arrays.toString(bb.array())); 
  
            // Creating a read-only copy of ByteBuffer 
            // using asReadOnlyBuffer() method 
            ByteBuffer bb1 = bb.asReadOnlyBuffer(); 
  
            System.out.println("\nTrying to put the byte value"
                               + " in read only buffer"); 
  
            // putting the value in readonly ByteBuffer 
            // using put() method 
            bb1.put((byte)40); 
        } 
  
        catch (BufferOverflowException e) { 
  
            System.out.println("buffer's current position "
                               + "is not smaller than its limit"); 
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Original ByteBuffer: [10, 20, 30]

Trying to put the byte value in read only buffer
Exception throws:java.nio.ReadOnlyBufferException

参考： https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#put-byte-



put(int index, byte f)

java.nio.ByteBuffer类的put(int index，byte f)方法用于将给定字节写入给定索引处的缓冲区。

用法:

public abstract ByteBuffer put(int index, byte f)

参数：此方法将以下参数作为参数：

  • index：将写入字节的索引
  • f：要写入的字节值

返回值：此方法返回此缓冲区。

异常：此方法引发以下异常：

  • IndexOutOfBoundsException-如果索引为负或不小于缓冲区的限制
  • ReadOnlyBufferException-如果此缓冲区是只读的

以下示例说明了put(int index，byte f)方法：

范例1：

// Java program to demonstrate 
// put() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 3; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer using put() at  index 0 
            bb.put(0, (byte)10); 
  
            // putting the value in ByteBuffer using put() at  index 2 
            bb.put(2, (byte)20); 
  
            // putting the value in ByteBuffer using put() at  index 1 
            bb.put(1, (byte)30); 
  
            // rewinding the ByteBuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer:  "
                               + Arrays.toString(bb.array())); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Original ByteBuffer: [10, 30, 20]

范例2：演示IndexOutOfBoundsException。

// Java program to demonstrate 
// put() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 3; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer using put() at  index 0 
            bb.put(0, (byte)10); 
  
            // putting the value in ByteBuffer using put() at  index 2 
            bb.put(2, (byte)20); 
  
            // putting the value in ByteBuffer using put() at  index 1 
            bb.put(1, (byte)30); 
  
            // rewinding the ByteBuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer:  "
                               + Arrays.toString(bb.array())); 
  
            // putting the value in ByteBuffer using put() at  index -1 
            bb.put(-1, (byte)40); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("\nindex is negative or not smaller "
                               + "than the buffer's limit"); 
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Original ByteBuffer: [10, 30, 20]

index is negative or not smaller than the buffer's limit
Exception throws:java.lang.IndexOutOfBoundsException

范例3：演示ReadOnlyBufferException。

// Java program to demonstrate 
// put() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 3; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity using allocate() method 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // Creating a read-only copy of ByteBuffer 
            // using asReadOnlyBuffer() method 
            ByteBuffer bb1 = bb.asReadOnlyBuffer(); 
  
            System.out.println("Trying to put the byte value"
                               + " in read only buffer"); 
  
            // putting the value in readonly ByteBuffer 
            // using put() method 
            bb1.put(0, (byte)10); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Trying to put the byte value in read only buffer
Exception throws:java.nio.ReadOnlyBufferException

参考： https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#put-int-byte-




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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 ByteBuffer put() methods in Java with Examples | Set -1。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。