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Java ByteBuffer getShort()用法及代碼示例


getShort()

java.nio.ByteBuffer類的getShort()方法用於讀取此緩衝區當前位置的下兩個字節，根據當前字節順序將它們組成一個短值，然後將該位置加2。

用法:

public abstract short getShort()

返回值：此方法返回緩衝區當前位置的short值。


拋出：如果此緩衝區中剩餘的字節數少於四個，則此方法拋出BufferUnderflowException。

下麵是說明getShort()方法的示例：

範例1：

// Java program to demonstrate 
// getShort() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 6; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the short value in the bytebuffer 
            bb.asShortBuffer() 
                .put((short)1034) 
                .put((short)1035) 
                .put((short)1036); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer: "); 
            for (int i = 1; i <= capacity / 2; i++) 
                System.out.print(bb.getShort() + " "); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // Reads the long at this buffer's current position 
            // using getShort() method 
            long value = bb.getShort(); 
  
            // print the long value 
            System.out.println("\n\nByte Value: " + value); 
  
            // Reads the short at this buffer's next position 
            // using getShort() method 
            long value1 = bb.getShort(); 
  
            // print the short value 
            System.out.print("\nNext Byte Value: " + value1); 
        } 
  
        catch (BufferUnderflowException e) { 
  
            System.out.println("\nException Thrown : " + e); 
        } 
    } 
}
輸出： 
Original ByteBuffer: 
1034 1035 1036 

Byte Value: 1034

Next Byte Value: 1035

範例2：

// Java program to demonstrate 
// getShort() 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 the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the short value in the bytebuffer 
            bb.asShortBuffer() 
                .put((short)1034) 
                .put((short)1036); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer: "); 
            for (int i = 1; i <= capacity / 2; i++) 
                System.out.print(bb.getShort() + " "); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // Reads the long at this buffer's current position 
            // using getShort() method 
            long value = bb.getShort(); 
  
            // print the long value 
            System.out.println("\n\nByte Value: " + value); 
  
            // Reads the short at this buffer's next position 
            // using getShort() method 
            long value1 = bb.getShort(); 
  
            // print the short value 
            System.out.print("\nNext Byte Value: " + value1); 
  
            // Reads the short at this buffer's next position 
            // using getShort() method 
            long value2 = bb.getShort(); 
        } 
  
        catch (BufferUnderflowException e) { 
            System.out.println("\nthere are fewer than"
                               + " two bytes remaining in this buffer"); 
            System.out.println("Exception Thrown : " + e); 
        } 
    } 
}
輸出： 
Original ByteBuffer: 
1034 1036 

Byte Value: 1034

Next Byte Value: 1036
there are fewer than two bytes remaining in this buffer
Exception Thrown : java.nio.BufferUnderflowException

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

getLong(int索引)

ByteBuffer的getLong(int index)方法用於讀取給定索引處的四個字節，並根據當前字節順序將它們組成一個float值。

用法:

public abstract long getLong(int index)

參數：此方法將索引(將從中讀取Byte的索引)作為參數。


返回值：此方法返回給定索引處的long值。

異常：此方法引發IndexOutOfBoundsException。如果index為負或不小於緩衝區的限製，則拋出此異常。

以下示例說明了getLong(int index)方法：

範例1：

// Java program to demonstrate 
// getShort() 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 the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the short value in the bytebuffer 
            bb.asShortBuffer() 
                .put((short)1034) 
                .put((short)1036); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer: "); 
            for (int i = 1; i <= capacity / 2; i++) 
                System.out.print(bb.getShort() + " "); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // Reads the long at this buffer's current position 
            // using getShort() method 
            long value = bb.getShort(0); 
  
            // print the long value 
            System.out.println("\n\nByte Value: " + value); 
  
            // Reads the short at this buffer's next position 
            // using getShort() method 
            long value1 = bb.getShort(2); 
  
            // print the short value 
            System.out.print("\nNext Byte Value: " + value1); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("\nindex is negative or "
                               + "smaller than the buffer's limit, "
                               + " minus seven"); 
            System.out.println("Exception Thrown : " + e); 
        } 
    } 
}
輸出： 
Original ByteBuffer: 
1034 1036 

Byte Value: 1034

Next Byte Value: 1036

範例2：

// Java program to demonstrate 
// getShort() 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 the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the short value in the bytebuffer 
            bb.asShortBuffer() 
                .put((short)1034) 
                .put((short)1036); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.println("Original ByteBuffer: "); 
            for (int i = 1; i <= capacity / 2; i++) 
                System.out.print(bb.getShort() + " "); 
  
            // rewind the Bytebuffer 
            bb.rewind(); 
  
            // Reads the long at this buffer's current position 
            // using getShort() method 
            long value = bb.getShort(0); 
  
            // print the long value 
            System.out.println("\n\nByte Value: " + value); 
  
            // Reads the short at this buffer's next position 
            // using getShort() method 
            long value1 = bb.getShort(3); 
  
            // print the short value 
            System.out.print("\nNext Byte Value: " + value1); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("\nindex is negative or smaller "
                               + "than the buffer's limit, "
                               + "minus one"); 
            System.out.println("Exception Thrown : " + e); 
        } 
    } 
}
輸出： 
Original ByteBuffer: 
1034 1036 

Byte Value: 1034

index is negative or smaller than the buffer's limit, minus one
Exception Thrown : java.lang.IndexOutOfBoundsException

參考： https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getShort-int-



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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 getShort() 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。