Java CharBuffer slice()用法及代码示例

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。这两个缓冲区的位置，限制和标记值将是独立的。

新缓冲区的位置将为零，其容量和限制将为该缓冲区中剩余的整数数量，并且其标记将不确定。当且仅当此缓冲区是直接缓冲区时，新缓冲区才是直接缓冲区，并且仅当且仅当此缓冲区是只读缓冲区时，它才是只读的。

用法:

public abstract CharBuffer slice()

返回值：此方法返回新的char缓冲区。

下面是说明slice()方法的示例：

示例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 subsequance buffer of given CharBuffer 
            // using slice() method 
            CharBuffer cb2 = cb1.slice(); 
  
            // print the shared subsequance buffer 
            System.out.println("shared subsequance 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 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 subsequance buffer of given CharBuffer 
            // using slice() method 
            CharBuffer cb2 = cb1.slice(); 
            cb2.put('k'); 
            cb2.put('l'); 
  
            // print the shared subsequance buffer 
            System.out.println("shared subsequance 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

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CharBuffer slice() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。