Java 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一个共享子序列。

新缓冲区的内容将从这个缓冲区的当前位置开始。这个缓冲区的内容的变化将在新的缓冲区中可见，反之亦然。两个缓冲区的位置、极限和标记值将是独立的。新缓冲区的位置将是0，它的容量和极限将是这个缓冲区中剩余的整数的数量，它的标记将是未定义的。新的缓冲区将是直接的，当且仅当这个缓冲区是直接的，它将是只读的，当且仅当这个缓冲区是只读的。

语法

public abstract IntBuffer slice()

返回值： 该方法返回 新的int buffer。

下面是一些例子来说明slice()方法。

例子 1 :

// 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

例子 2 :

// 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