Java 中的缓冲容量()方法，示例
原文:https://www . geesforgeks . org/buffer-capacity-in-Java-method-with-examples/
java.nio.Buffer 类 的容量()方法用于返回该缓冲区的容量。
语法:
public final int capacity()
返回值:该缓冲区的容量
以下是说明容量()方法的示例:
示例 1:
// Java program to demonstrate
// capacity() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(7);
// putting the int to byte typecast
// value in ByteBuffer
bb.put((byte)20);
bb.put((byte)30);
bb.put((byte)40);
bb.put((byte)50);
// Typecasting ByteBuffer into Buffer
Buffer bb1 = (Buffer)bb;
// getting capacity of Buffer
// using capacity() method
int cap = bb1.capacity();
// display the result
System.out.println("capacity is: "
+ cap);
}
}
输出:
capacity is: 7
示例 2:
// Java program to demonstrate
// capacity() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring and initializing byte array
byte[] byt = { (byte)20, (byte)30,
(byte)40, (byte)50,
(byte)60 };
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.wrap(byt);
// Typecasting ByteBuffer into Buffer
Buffer bb1 = (Buffer)bb;
// getting capacity of Buffer
// using capacity() method
int cap = bb1.capacity();
// display the result
System.out.println("capacity is: "
+ cap);
}
}
输出:
capacity is: 5
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/buffer . html # capacity–
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