Java 中的 ByteBuffer order()方法，带示例

原文:https://www . geeksforgeeks . org/bytebuffer-order-method-in-Java-with-examples/

order()

Java . nio . bytebuffer类的 order() 方法用于检索该缓冲区的字节顺序。读取或写入多字节值时，以及创建作为该字节缓冲区视图的缓冲区时，使用字节顺序。新创建的字节缓冲区的顺序始终是 BIG_ENDIAN。

语法:

public final ByteOrder order()

返回值:这个方法返回这个缓冲区的字节顺序。

下面是说明 order()方法的示例:

实施例 1:

// Java program to demonstrate
// order() 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(12);

        // putting the int value in the bytebuffer
        bb.asIntBuffer()
            .put(10)
            .put(20)
            .put(30);

        // rewind the Bytebuffer
        bb.rewind();

        // print the ByteBuffer
        System.out.println("Original ByteBuffer: ");
        for (int i = 1; i <= 3; i++)
            System.out.print(bb.getInt() + " ");

        // rewind the Bytebuffer
        bb.rewind();

        // Reads the Int at this buffer's current position
        // using order() method
        ByteOrder value = bb.order();

        // print the int value
        System.out.println("\n\nByte Value: " + value);
    }
}

Output:

Original ByteBuffer: 
10 20 30 

Byte Value: BIG_ENDIAN

实施例 2:

// Java program to demonstrate
// order() 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(12);

        // Reads the Int at this buffer's current position
        // using order() method
        ByteOrder value = bb.order();

        // print the int value
        System.out.println("Byte Value: " + value);
    }
}

Output:

Byte Value: BIG_ENDIAN

order(ByteOrder bo)

ByteBuffer 的 order(ByteOrder bo)方法用于修改该缓冲区的字节顺序。

语法:

public final ByteBuffer order(ByteOrder bo)

参数:该方法采用新的字节顺序，可以是 BIG_ENDIAN，也可以是 LITTLE_ENDIAN 作为参数。

返回值:这个方法返回这个缓冲区。

以下是说明顺序(ByteOrder bo) 方法的示例:

实施例 1:

// Java program to demonstrate
// order() 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(12);

        // Reads the Int at this buffer's current position
        // using order() method
        ByteOrder oldbyteorder = bb.order();

        // print the result
        System.out.println("Old Byte Order: " + oldbyteorder);

        // Modifies this buffer's byte order
        // by using order() method
        ByteBuffer bb1 = bb.order(ByteOrder.nativeOrder());

        // Reads the Int at this buffer's current position
        // using order() method
        ByteOrder newbyteorder = bb1.order();

        // print the result
        System.out.println("New Byte Order: " + newbyteorder);
    }
}

Output:

Old Byte Order: BIG_ENDIAN
New Byte Order: LITTLE_ENDIAN

实施例 2:

// Java program to demonstrate
// order() 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(12);

        // putting the int value in the bytebuffer
        bb.asIntBuffer()
            .put(10)
            .put(20)
            .put(30);

        // rewind the Bytebuffer
        bb.rewind();

        // print the ByteBuffer
        System.out.println("Original ByteBuffer: ");
        for (int i = 1; i <= 3; i++)
            System.out.print(bb.getInt() + " ");

        // rewind the Bytebuffer
        bb.rewind();

        // Reads the Int at this buffer's current position
        // using order() method
        ByteOrder oldbyteorder = bb.order();

        // print the result
        System.out.println("Old Byte Order: " + oldbyteorder);

        // Modifies this buffer's byte order
        // by using order() method
        ByteBuffer bb1 = bb.order(ByteOrder.nativeOrder());

        // Reads the Int at this buffer's current position
        // using order() method
        ByteOrder newbyteorder = bb1.order();

        // print the result
        System.out.println("New Byte Order: " + newbyteorder);
    }
}

Output:

Original ByteBuffer: 
10 20 30 Old Byte Order: BIG_ENDIAN
New Byte Order: LITTLE_ENDIAN

参考:

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