Java ByteBuffer toString()用法及代碼示例

ByteBuffer類的toString()方法是用於返回表示ByteBuffer對象包含的數據的字符串的內置方法。創建並初始化一個新的String對象，以從該ByteBuffer對象獲取字符序列，然後由toString()返回String。 Object包含的對該序列的後續更改不會影響String的內容。

用法:

public abstract String toString()

返回值：此方法返回表示ByteBuffer對象包含的數據的字符串。

以下示例程序旨在說明ByteBuffer.toString()方法：

示例1:

// Java program to demonstrate 
// toString() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 5; 
  
        // creating object of ByteBuffer 
        // and allocating size capacity 
        ByteBuffer bb1 = ByteBuffer.allocate(capacity); 
  
        // putting the value in ByteBuffer 
        bb1.put((byte)10); 
        bb1.put((byte)20); 
  
        // print the ByteBuffer 
        System.out.println("Original ByteBuffer: "
                           + Arrays.toString(bb1.array())); 
  
        // Creating a shared subsequance buffer of given ByteBuffer 
        // using toString() method 
        String value = bb1.toString(); 
  
        // print the ByteBuffer 
        System.out.println("\nstring representation of ByteBuffer:  "
                           + value); 
    } 
}

輸出：

Original ByteBuffer: [10, 20, 0, 0, 0]

string representation of ByteBuffer:  java.nio.HeapByteBuffer[pos=2 lim=5 cap=5]

示例2:

// Java program to demonstrate 
// toString() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 4; 
  
        // creating object of ByteBuffer 
        // and allocating size capacity 
        ByteBuffer bb1 = ByteBuffer.allocate(capacity); 
  
        // putting the value in ByteBuffer 
        bb1.put((byte)10) 
            .put((byte)20) 
            .put((byte)30) 
            .put((byte)40); 
  
        // print the ByteBuffer 
        System.out.println("Original ByteBuffer: "
                           + Arrays.toString(bb1.array())); 
  
        // Creating a shared subsequance buffer of given ByteBuffer 
        // using toString() method 
        String value = bb1.toString(); 
  
        // print the ByteBuffer 
        System.out.println("\nstring representation of ByteBuffer:  "
                           + value); 
    } 
}

輸出：

Original ByteBuffer: [10, 20, 30, 40]

string representation of ByteBuffer:  java.nio.HeapByteBuffer[pos=4 lim=4 cap=4]

參考： https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#toString–

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 ByteBuffer toString() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。