Java 中的 ByteBuffer putInt()方法，带示例
原文:https://www . geeksforgeeks . org/bytebuffer-putint-methods-in-Java-with-examples/
Int 值
Java . nio . bytebuffer类的 putInt(Int 值)方法用于按照当前字节顺序将包含给定 int 值的四个字节写入当前位置的缓冲区，然后将该位置递增四。
语法:
public abstract ByteBuffer putInt(int value)
参数:该方法以待写入的 int 值为参数。
返回值:这个方法返回这个字节缓冲区。
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 putInt(int 值)方法的例子:
例 1:
// Java program to demonstrate
// putInt() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putInt() method
bb.putInt(23)
.putInt(24)
.putInt(30)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer: [ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getInt() + " ");
System.out.print("]");
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出:
Original ByteBuffer: [ 23 24 30 ]
例 2: 演示 BufferOverflowException。
// Java program to demonstrate
// putInt() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putInt() method
bb.putInt(23)
.putInt(24)
.putInt(30)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer: [ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getInt() + " ");
System.out.print("]");
// putting the value in ByteBuffer
// using putInt() method
bb.putInt(234);
}
catch (BufferOverflowException e) {
System.out.println("\n\nbuffer'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: [ 23 24 30 ]
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
// putInt() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putInt() method
bb.putInt(23)
.putInt(24)
.putInt(30)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer: [ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getInt() + " ");
System.out.print("]");
// Creating a read-only copy of ByteBuffer
// using asReadOnlyBuffer() method
ByteBuffer bb1 = bb.asReadOnlyBuffer();
System.out.println("\n\nTrying to put the int value"
+ " in read-only buffer");
// putting the value in readonly ByteBuffer
// using putInt() method
bb1.putInt(234);
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出:
Original ByteBuffer: [ 23 24 30 ]
Trying to put the int value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException
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