Java IntBuffer rewind()用法及代碼示例

java.nio.IntBuffer類的rewind()方法用於倒帶此緩衝區。位置設置為零，標記被丟棄。假設已正確設置了限製，請在序列channel-write或get操作之前調用此方法。調用此方法既不會更改，也不會丟棄標記的值。

用法:

public final IntBuffer rewind()

參數：該方法不帶任何參數。

返回值：此方法返回此緩衝區。

下麵是說明rewind()方法的示例：

範例1：

// Java program to demonstrate 
// rewind() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating IntBuffer 
        // using allocate() method 
        IntBuffer intBuffer 
            = IntBuffer.allocate(4); 
  
        // put char value in intBuffer 
        // using put() method 
        intBuffer.put(10); 
        intBuffer.put(20); 
  
        // print the int buffer 
        System.out.println( 
            "Buffer before operation: "
            + Arrays.toString( 
                  intBuffer.array()) 
            + "\nPosition: "
            + intBuffer.position() 
            + "\nLimit: "
            + intBuffer.limit()); 
  
        // rewind the Buffer 
        // using rewind() method 
        intBuffer.rewind(); 
  
        // print the intbuffer 
        System.out.println( 
            "\nBuffer after operation: "
            + Arrays.toString( 
                  intBuffer.array()) 
            + "\nPosition: "
            + intBuffer.position() 
            + "\nLimit: "
            + intBuffer.limit()); 
    } 
}

輸出：

Buffer before operation: [10, 20, 0, 0]
Position: 2
Limit: 4

Buffer after operation: [10, 20, 0, 0]
Position: 0
Limit: 4

範例2：

// Java program to demonstrate 
// rewind() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating IntBuffer 
        // using allocate() method 
        IntBuffer intBuffer 
            = IntBuffer.allocate(5); 
  
        // put int value in IntBuffer 
        // using put() method 
        intBuffer.put(10); 
        intBuffer.put(20); 
        intBuffer.put(30); 
  
        // mark will be going to 
        // discarded by rewind() 
        intBuffer.mark(); 
  
        // print the buffer 
        System.out.println( 
            "Buffer before operation: "
            + Arrays.toString( 
                  intBuffer.array()) 
            + "\nPosition: "
            + intBuffer.position() 
            + "\nLimit: "
            + intBuffer.limit()); 
  
        // Rewind the Buffer 
        // using rewind() method 
        intBuffer.rewind(); 
  
        // print the buffer 
        System.out.println( 
            "\nBuffer after operation: "
            + Arrays.toString( 
                  intBuffer.array()) 
            + "\nPosition: "
            + intBuffer.position() 
            + "\nLimit: "
            + intBuffer.limit()); 
    } 
}

輸出：

Buffer before operation: [10, 20, 30, 0, 0]
Position: 3
Limit: 5

Buffer after operation: [10, 20, 30, 0, 0]
Position: 0
Limit: 5

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

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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 IntBuffer rewind() 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。