Java 中的 CharBuffer length()方法，示例
原文:https://www . geesforgeks . org/char buffer-length-methods-in-Java-with-examples/
java.nio.CharBuffer 类的 length() 方法用来返回这个字符缓冲区的长度。当视为字符序列时，字符缓冲区的长度只是位置(包括)和限制(不包括)之间的字符数；也就是说，它相当于剩余()。
语法:
public final int length()
返回值:这个方法返回这个字符缓冲区的长度。
下面是说明 length()方法的示例:
示例 1:
// Java program to demonstrate
// length() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declare and initialize the char array
char[] cb = { 'a', 'b', 'c' };
// wrap the char array into CharBuffer
// using wrap() method
CharBuffer charBuffer = CharBuffer.wrap(cb);
// Get the length of the charBuffer
// using length() method
int length = charBuffer.length();
// print the byte buffer
System.out.println("CharBuffer is : "
+ Arrays.toString(
charBuffer.array())
+ "\nLength: "
+ length);
}
}
输出:
CharBuffer is : [a, b, c]
Length: 3
示例 2:
// Java program to demonstrate
// length() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// defining and allocating CharBuffer
// using allocate() method
CharBuffer charBuffer
= CharBuffer.allocate(4);
// append char value in charBuffer
// using append() method
charBuffer.append('a');
charBuffer.append('b');
// print the char buffer
System.out.println("CharBuffer before append : "
+ Arrays.toString(
charBuffer.array())
+ "\nLength: "
+ charBuffer.length());
// append char value in charBuffer
// using append() method
charBuffer.append('c');
// print the char buffer
System.out.println("\nCharBuffer after append : "
+ Arrays.toString(
charBuffer.array())
+ "\nLength: "
+ charBuffer.length());
}
}
输出:
CharBuffer before append : [a, b,, ]
Length: 2
CharBuffer after append : [a, b, c, ]
Length: 1
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/charbuffer . html # length–
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