Java 中的字节缓冲片()方法，示例
原文:https://www . geeksforgeeks . org/bytebuffer-slice-method-in-Java-with-examples/
java.nio.ByteBuffer 类的 slice() 方法用于创建新的字节缓冲区，其内容是给定缓冲区内容的共享子序列。
新缓冲区的内容将从该缓冲区的当前位置开始。对此缓冲区内容的更改将在新缓冲区中可见，反之亦然。两个缓冲器的位置、极限和标记值将是独立的。
新缓冲区的位置将为零，其容量和限制将是该缓冲区中剩余的浮点数，其标记将是未定义的。如果且仅当该缓冲区是直接的，则新缓冲区将是直接的；如果且仅当该缓冲区是只读的，则新缓冲区将是只读的。
语法:
public abstract ByteBuffer slice()
返回值:该方法返回新的字节缓冲区。
下面是说明 slice()方法的示例:
实施例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 5;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb1
= ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
bb1.put((byte)10);
bb1.put((byte)20);
// print the ByteBuffer
System.out.println("Original ByteBuffer: "
+ Arrays.toString(bb1.array()));
// print the ByteBuffer position
System.out.println("\nposition: "
+ bb1.position());
// print the ByteBuffer capacity
System.out.println("\ncapacity: "
+ bb1.capacity());
// Creating a shared subsequence buffer
// of given ByteBuffer
// using slice() method
ByteBuffer bb2 = bb1.slice();
// print the shared subsequence buffer
System.out.println("\nshared subsequence ByteBuffer: "
+ Arrays.toString(bb2.array()));
// print the ByteBuffer position
System.out.println("\nposition: " + bb2.position());
// print the ByteBuffer capacity
System.out.println("\ncapacity: " + bb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output
Original ByteBuffer: [10, 20, 0, 0, 0]
position: 2
capacity: 5
shared subsequence ByteBuffer: [10, 20, 0, 0, 0]
position: 0
capacity: 3
实施例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 5;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb1 = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
bb1.put((byte)10)
.put((byte)20)
.put((byte)30)
.put((byte)40)
.put((byte)50);
// print the ByteBuffer
System.out.println("Original ByteBuffer: "
+ Arrays.toString(bb1.array()));
// print the ByteBuffer position
System.out.println("\nposition: "
+ bb1.position());
// print the ByteBuffer capacity
System.out.println("\ncapacity: "
+ bb1.capacity());
// Creating a shared subsequence buffer
// of given ByteBuffer
// using slice() method
ByteBuffer bb2 = bb1.slice();
// print the shared subsequence buffer
System.out.println("\nshared subsequence ByteBuffer: "
+ Arrays.toString(bb2.array()));
// print the ByteBuffer position
System.out.println("\nposition: " + bb2.position());
// print the ByteBuffer capacity
System.out.println("\ncapacity: " + bb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output
Original ByteBuffer: [10, 20, 30, 40, 50]
position: 5
capacity: 5
shared subsequence ByteBuffer: [10, 20, 30, 40, 50]
position: 0
capacity: 0
参考:T2【https://docs . Oracle . com/javase/9/docs/API/Java/nio/bytebuffer . html # slice–T4】
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