Java CharBuffer slice()方法

java.nio.charBuffer 类的 slice() 方法用于创建一个 新的char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。新的缓冲区将显示在缓冲区的内容中所作的改变，反之亦然。两个缓冲区的位置、极限和标记值将是独立的。新的缓冲区的位置将是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。如果，也只有当这个缓冲区是直接的，那么新的缓冲区将是直接的，如果，也只有当这个缓冲区是只读的，它将是只读的。

语法

public abstract CharBuffer slice()

返回值： 该方法返回 新的char缓冲区 。

下面是说明slice()方法的例子。

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 CharBuffer
        int capacity = 10;
 
        // Creating the CharBuffer
        try {
 
            // creating object of Charbuffer
            // and allocating size capacity
            CharBuffer cb1 = CharBuffer.allocate(capacity);
 
            // putting the value in intbuffer
            cb1.put('a');
            cb1.put('b');
 
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb1.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb1.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb1.capacity());
 
            // Creating a shared subsequence buffer of given CharBuffer
            // using slice() method
            CharBuffer cb2 = cb1.slice();
 
            // print the shared subsequence buffer
            System.out.println("shared subsequence CharBuffer: "
                               + Arrays.toString(cb2.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb2.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb2.capacity());
        }
 
        catch (IllegalArgumentException e) {
 
            System.out.println("IllegalArgumentException catched");
        }
 
        catch (ReadOnlyBufferException e) {
 
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

输出

Original CharBuffer: [a, b, , , , , , , , ]
position: 2
capacity: 10
shared subsequence CharBuffer: [a, b, , , , , , , , ]
position: 0
capacity: 8

例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 CharBuffer
        int capacity = 10;
 
        // Creating the CharBuffer
        try {
 
            // creating object of charbuffer
            // and allocating size capacity
            CharBuffer cb1 = CharBuffer.allocate(capacity);
 
            // putting the value in floatbuffer
            cb1.put('a');
            cb1.put('b');
            cb1.put('c');
            cb1.put('d');
 
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb1.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb1.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb1.capacity());
 
            // Creating a shared subsequence buffer of given CharBuffer
            // using slice() method
            CharBuffer cb2 = cb1.slice();
            cb2.put('k');
            cb2.put('l');
 
            // print the shared subsequence buffer
            System.out.println("shared subsequence CharBuffer: "
                               + Arrays.toString(cb2.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb2.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb2.capacity());
        }
 
        catch (IllegalArgumentException e) {
 
            System.out.println("IllegalArgumentException catched");
        }
 
        catch (ReadOnlyBufferException e) {
 
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

输出

Original CharBuffer: [a, b, c, d, , , , , , ]
position: 4
capacity: 10
shared subsequence CharBuffer: [a, b, c, d, k, l, , , , ]
position: 2
capacity: 6