Java中的IntBuffer slice()方法

Java.nio.IntBuffer类的slice()方法用于创建一个新的 int 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。两个缓冲区的位置、限制和标记值将是独立的。新缓冲区的位置将为零，其容量和限制将是此缓冲区中剩余的整数数，其标记将是未定义的。当且仅当此缓冲区是直接的时，新缓冲区将是直接的，并且当且仅当此缓冲区是只读的时，它将是只读的。

句法：

public abstract IntBuffer slice()

返回值：此方法返回新的 int 缓冲区。

以下是说明 slice() 方法的示例：

示例 1：

Java

// 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 IntBuffer
        int capacity = 10;
 
        // Creating the IntBuffer
        try {
 
            // creating object of intbuffer
            // and allocating size capacity
            IntBuffer ib1 = IntBuffer.allocate(capacity);
 
            // putting the value in intbuffer
            ib1.put(8);
            ib1.put(9);
 
            // print the IntBuffer
            System.out.println("Original IntBuffer: "
                               + Arrays.toString(ib1.array()));
 
            // print the IntBuffer position
            System.out.println("position: " + ib1.position());
 
            // print the IntBuffer capacity
            System.out.println("capacity: " + ib1.capacity());
 
            // Creating a shared subsequence buffer of given IntBuffer
            // using slice() method
            IntBuffer ib2 = ib1.slice();
 
            // print the shared subsequence buffer
            System.out.println("shared subsequence IntBuffer: "
                               + Arrays.toString(ib2.array()));
 
            // print the IntBuffer position
            System.out.println("position: " + ib2.position());
 
            // print the IntBuffer capacity
            System.out.println("capacity: " + ib2.capacity());
        }
 
        catch (IllegalArgumentException e) {
            System.out.println("IllegalArgumentException catched");
        }
 
        catch (ReadOnlyBufferException e) {
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

输出

Original IntBuffer: [8, 9, 0, 0, 0, 0, 0, 0, 0, 0]
position: 2
capacity: 10
shared subsequence IntBuffer: [8, 9, 0, 0, 0, 0, 0, 0, 0, 0]
position: 0
capacity: 8

示例 2：

Java

// 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 IntBuffer
        int capacity = 10;
 
        // Creating the IntBuffer
        try {
 
            // creating object of intbuffer
            // and allocating size capacity
            IntBuffer ib1 = IntBuffer.allocate(capacity);
 
            // putting the value in floatbuffer
            ib1.put(8);
            ib1.put(9);
            ib1.put(5);
            ib1.put(3);
 
            // print the IntBuffer
            System.out.println("Original IntBuffer: "
                               + Arrays.toString(ib1.array()));
 
            // print the IntBuffer position
            System.out.println("position: " + ib1.position());
 
            // print the IntBuffer capacity
            System.out.println("capacity: " + ib1.capacity());
 
            // Creating a shared subsequence buffer of given IntBuffer
            // using slice() method
            IntBuffer ib2 = ib1.slice();
            ib2.put(2);
            ib2.put(6);
 
            // print the shared subsequence buffer
            System.out.println("shared subsequence IntBuffer: "
                               + Arrays.toString(ib2.array()));
 
            // print the IntBuffer position
            System.out.println("position: " + ib2.position());
 
            // print the IntBuffer capacity
            System.out.println("capacity: " + ib2.capacity());
        }
 
        catch (IllegalArgumentException e) {
 
            System.out.println("IllegalArgumentException catched");
        }
 
        catch (ReadOnlyBufferException e) {
 
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

输出

Original IntBuffer: [8, 9, 5, 3, 0, 0, 0, 0, 0, 0]
position: 4
capacity: 10
shared subsequence IntBuffer: [8, 9, 5, 3, 2, 6, 0, 0, 0, 0]
position: 2
capacity: 6