Java CharBuffer chars()方法及实例

java.nio.CharBuffer 类的 chars() 方法是用来返回一个int零扩展的char值流，从这个序列中。任何映射到代理代码点的char都会被不加解释地通过。当终端流操作开始时，流绑定到这个序列（具体来说，对于可变的序列，流的分割器是晚绑定的）。如果在该操作过程中序列被修改，那么结果是未定义的。

语法

public IntStream chars()

返回值： 该方法从该序列中返回一个 IntStream 的char值。下面是说明chars()方法的例子：

例1 :

// Java program to demonstrate
// chars() method
 
import java.nio.*;
import java.util.*;
import java.util.stream.IntStream;
 
public class GFG {
    public static void main(String[] args)
    {
        // creating object of CharBuffer
        // and allocating size capacity
        CharBuffer charbuffer
            = CharBuffer.allocate(3);
 
        // append the value in CharBuffer
        // using append() method
        charbuffer.append('a')
            .append('b')
            .append('c')
            .rewind();
 
        // print the CharBuffer
        System.out.println("Original CharBuffer:  "
                           + Arrays.toString(
                                 charbuffer.array())
                           + "\n");
 
        // Read char at particular Index
        // using chars() method
        IntStream stream = charbuffer.chars();
 
        // Display the stream of int zero-extending
        // the char values from this sequence
        stream.forEach(System.out::println);
    }
}

输出

Original CharBuffer:  [a, b, c]

97
98
99

例2 :

// Java program to demonstrate
// chars() method
 
import java.nio.*;
import java.util.*;
import java.util.stream.IntStream;
 
public class GFG {
    public static void main(String[] args)
    {
        // creating object of CharBuffer
        // and allocating size capacity
        CharBuffer charbuffer
            = CharBuffer.allocate(5);
 
        // append the value in CharBuffer
        // using append() method
        charbuffer.append((char)140)
            .append((char)117)
            .append((char)118)
            .append((char)0)
            .append((char)90)
            .rewind();
 
        // print the CharBuffer
        System.out.println("Original CharBuffer:  "
                           + Arrays.toString(
                                 charbuffer.array())
                           + "\n");
 
        // Read char at particular Index
        // using chars() method
        IntStream stream = charbuffer.chars();
 
        // Display the stream of int zero-extending
        // the char values from this sequence
        stream.forEach(System.out::println);
    }
}

输出

Original CharBuffer:  [?, u, v, , Z]

140
117
118
0
90

参考资料: https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#chars-