Java中的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。新缓冲区将显示缓冲区内容中所做的更改，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，则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 CharBuffer slice()

返回值：此方法返回新的字符缓冲区。

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 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 subsequance CharBuffer: [a, b, , , , , , , , ]
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 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 subsequance CharBuffer: [a, b, c, d, k, l, , , , ]
position: 2
capacity: 6