ByteBuffer 将()方法放入 Java 中，示例| Set -1
原文:https://www . geeksforgeeks . org/bytebuffer-put-methods-in-Java-with-examples-set-1/
put(字节 b)
java.nio.ByteBuffer 类的 put(byte b) 方法用于将给定的字节写入当前位置新创建的字节缓冲区，然后递增该位置。
语法:
public abstract ByteBuffer put(byte f)
参数:该方法将字节值 b 作为参数写入字节缓冲区。
返回值:这个方法返回这个缓冲区，其中插入了字节值。
异常:此方法抛出以下异常:
- Bufferovflowexception- If the current position of this buffer is not less than its limit
- ReadonlyBufferenexception- If this buffer is read-only,
下面是举例说明 put(字节 b)方法的例子:
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]
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
示例 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
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