Java FloatBuffer mark()用法及代碼示例

java.nio.FloatBuffer類的mark()方法用於將該FloatBuffer的當前位置標記為該緩衝區的標記。

用法:

public final FloatBuffer mark()

參數：該方法不帶任何參數。

返回值：在將緩衝區的標記設置在當前位置之後，此方法將返回此FloatBuffer。

以下示例說明了mark()方法：

範例1：

// Java program to demonstrate 
// mark() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        try { 
  
            float[] farr = { 10.5f, 20.5f, 30.5f, 40.5f }; 
  
            // creating object of FloatBuffer 
            // and allocating size capacity 
            FloatBuffer fb = FloatBuffer.wrap(farr); 
  
            // try to set the position at index 2 
            fb.position(2); 
  
            // Set this buffer mark position 
            // using mark() method 
            fb.mark(); 
  
            // try to set the position at index 4 
            fb.position(4); 
  
            // display position 
            System.out.println("position before reset:"
                               + fb.position()); 
  
            // try to call reset() to restore 
            // to the position we marked 
            fb.reset(); 
  
            // display position 
            System.out.println("position after reset:"
                               + fb.position()); 
        } 
  
        catch (InvalidMarkException e) { 
            System.out.println("New position "
                               + "is less than "
                               + "the position "
                               + "marked before "); 
            System.out.println("Exception throws:"
                               + e); 
        } 
    } 
}

輸出：

position before reset:4
position after reset:2

範例2：演示InvalidMarkException

// Java program to demonstrate 
// mark() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        try { 
  
            float[] farr = { 10.5f, 20.5f, 30.5f, 40.5f }; 
  
            // creating object of FloatBuffer 
            // and allocating size capacity 
            FloatBuffer fb = FloatBuffer.wrap(farr); 
  
            // try to set the position at index 2 
            fb.position(2); 
  
            // Set this buffer mark position 
            // using mark() method 
            fb.mark(); 
  
            // try to set the position at index 1 
            fb.position(1); 
  
            // display position 
            System.out.println("position before reset:"
                               + fb.position()); 
  
            // try to call reset() to restore 
            // to the position we marked 
            fb.reset(); 
  
            // display position 
            System.out.println("position after reset:"
                               + fb.position()); 
        } 
  
        catch (InvalidMarkException e) { 
            System.out.println("\nNew position "
                               + "is less than "
                               + "the position "
                               + "marked before "); 
            System.out.println("Exception throws:"
                               + e); 
        } 
    } 
}

輸出：

position before reset:1

New position is less than the position marked before 
Exception throws:java.nio.InvalidMarkException

參考： https://docs.oracle.com/javase/9/docs/api/java/nio/FloatBuffer.html#mark-

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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 FloatBuffer mark() methods 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。