Java ByteBuffer putInt()用法及代碼示例

putInt(int value)

java.nio.ByteBuffer類的putInt(int value)方法用於按當前字節順序將四個包含給定int值的字節按當前字節順序寫入此緩衝區的當前位置，然後將該位置增加4。

用法:

public abstract ByteBuffer putInt(int value)

參數：此方法將要寫入的int值作為參數。

返回值：此方法返回此ByteBuffer。

異常：此方法引發以下異常：

BufferOverflowException-如果此緩衝區的當前位置不小於其限製
ReadOnlyBufferException-如果此緩衝區是隻讀的

以下示例說明了putInt(int value)方法：

範例1：

// Java program to demonstrate 
// putInt() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 12; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer 
            // using putInt() method 
            bb.putInt(23) 
                .putInt(24) 
                .putInt(30) 
                .rewind(); 
  
            // print the ByteBuffer 
            System.out.print("Original ByteBuffer:[ "); 
            for (int i = 1; i <= capacity / 4; i++) 
                System.out.print(bb.getInt() + " "); 
            System.out.print("]"); 
        } 
  
        catch (BufferOverflowException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}

輸出：

Original ByteBuffer:[ 23 24 30 ]

範例2：演示BufferOverflowException。

// Java program to demonstrate 
// putInt() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 12; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer 
            // using putInt() method 
            bb.putInt(23) 
                .putInt(24) 
                .putInt(30) 
                .rewind(); 
  
            // print the ByteBuffer 
            System.out.print("Original ByteBuffer:[ "); 
            for (int i = 1; i <= capacity / 4; i++) 
                System.out.print(bb.getInt() + " "); 
            System.out.print("]"); 
  
            // putting the value in ByteBuffer 
            // using putInt() method 
            bb.putInt(234); 
        } 
  
        catch (BufferOverflowException e) { 
            System.out.println("\n\nbuffer's current position "
                               + "is not smaller than its limit"); 
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}

輸出：

Original ByteBuffer:[ 23 24 30 ]

buffer's current position is not smaller than its limit
Exception throws:java.nio.BufferOverflowException

範例3：演示ReadOnlyBufferException。

// Java program to demonstrate 
// putInt() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 12; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer 
            // using putInt() method 
            bb.putInt(23) 
                .putInt(24) 
                .putInt(30) 
                .rewind(); 
  
            // print the ByteBuffer 
            System.out.print("Original ByteBuffer:[ "); 
            for (int i = 1; i <= capacity / 4; i++) 
                System.out.print(bb.getInt() + " "); 
            System.out.print("]"); 
  
            // Creating a read-only copy of ByteBuffer 
            // using asReadOnlyBuffer() method 
            ByteBuffer bb1 = bb.asReadOnlyBuffer(); 
  
            System.out.println("\n\nTrying to put the int value"
                               + " in read-only buffer"); 
  
            // putting the value in readonly ByteBuffer 
            // using putInt() method 
            bb1.putInt(234); 
        } 
  
        catch (BufferOverflowException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}

輸出：

Original ByteBuffer:[ 23 24 30 ]

Trying to put the int value in read only buffer
Exception throws:java.nio.ReadOnlyBufferException

putInt(int index, int value)

java.nio.ByteBuffer類的putInt(int index，int value)方法用於按給定索引將包含給定四個值(按當前字節順序)的四個字節寫入當前緩衝區。

用法:

public abstract ByteBuffer putInt(int index, int value)

參數：此方法將以下參數作為參數：

index：將寫入字節的索引
value：要寫入的int值

返回值：此方法返回此緩衝區。

異常：此方法引發以下異常：

IndexOutOfBoundsException-如果索引為負或不小於緩衝區的限製
ReadOnlyBufferException-如果此緩衝區是隻讀的

以下示例說明了putInt(int index，int value)方法：

範例1：

// Java program to demonstrate 
// putInt() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 12; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index 0 
            bb.putInt(0, 23); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index 4 
            bb.putInt(4, 34); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index 8 
            bb.putInt(8, 27); 
  
            // rewinding the ByteBuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.print("Original ByteBuffer:[ "); 
            for (int i = 1; i <= capacity / 4; i++) 
                System.out.print(bb.getInt() + "  "); 
            System.out.print("]\n"); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}

輸出：

Original ByteBuffer:[ 23  34  27  ]

範例2：演示IndexOutOfBoundsException。

// Java program to demonstrate 
// putInt() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 12; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index 0 
            bb.putInt(0, 23); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index 4 
            bb.putInt(4, 34); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index 8 
            bb.putInt(8, 27); 
  
            // rewinding the ByteBuffer 
            bb.rewind(); 
  
            // print the ByteBuffer 
            System.out.print("Original ByteBuffer:[ "); 
            for (int i = 1; i <= capacity / 4; i++) 
                System.out.print(bb.getInt() + "  "); 
            System.out.print("]\n"); 
  
            // putting the value in ByteBuffer 
            // using putInt() at  index -1 
            bb.putInt(-1, 45); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("\nindex is negative or not smaller "
                               + "than the buffer's limit"); 
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}

輸出：

Original ByteBuffer:[ 23  34  27  ]

index is negative or not smaller than the buffer's limit
Exception throws:java.lang.IndexOutOfBoundsException

範例3：演示ReadOnlyBufferException。

// Java program to demonstrate 
// putInt() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ByteBuffer 
        int capacity = 12; 
  
        // Creating the ByteBuffer 
        try { 
  
            // creating object of ByteBuffer 
            // and allocating size capacity 
            ByteBuffer bb = ByteBuffer.allocate(capacity); 
  
            // Creating a read-only copy of ByteBuffer 
            // using asReadOnlyBuffer() method 
            ByteBuffer bb1 = bb.asReadOnlyBuffer(); 
  
            System.out.println("Trying to put the int value"
                               + " in read-only buffer"); 
  
            // putting the value in readonly ByteBuffer 
            // using putInt() method 
            bb1.putInt(0, 23); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("\nindex is negative or not smaller "
                               + "than the buffer's limit"); 
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}

輸出：

Trying to put the int value in read only buffer
Exception throws:java.nio.ReadOnlyBufferException

參考：

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 ByteBuffer putInt() 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。