ByteBuffer putInt() methods in Java with Examples

27 Jun, 2019
The putInt(int value) method of java.nio.ByteBuffer Class is used to write four bytes containing the given int value, in the current byte order, into this buffer at the current position, and then increments the position by four.
Syntax :
public abstract ByteBuffer putInt(int value)
Parameters: This method takes the int value to be written as the parameter.
Return Value: This method returns this ByteBuffer.
Exception: This method throws the following exceptions:
BufferOverflowException- If this buffer’s current position is not smaller than its limit
ReadOnlyBufferException- If this buffer is read-only
Below are the examples to illustrate the putInt(int value) method:
Example 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);        }    }}
Original ByteBuffer: [ 23 24 30 ]

Example 2: To demonstrate 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);        }    }}
Original ByteBuffer: [ 23 24 30 ]

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

Examples 3: To demonstrate 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);        }    }}
Original ByteBuffer: [ 23 24 30 ]

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

The putInt(int index, int value) method of java.nio.ByteBuffer Class is used to write four bytes containing the given four value, in the current byte order, into this buffer at the given index.
Syntax:
public abstract ByteBuffer putInt(int index, int value)
Parameters: This method takes the following arguments as a parameter:
index: The index at which the byte will be written
value: The int value to be written
Return Value: This method returns the this buffer.
Exception: This method throws the following exception:
IndexOutOfBoundsException- If index is negative or not smaller than the buffer’s limit
ReadOnlyBufferException- If this buffer is read-only
Below are the examples to illustrate the putInt(int index, int value) method:
Example 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);        }    }}
Original ByteBuffer: [ 23  34  27  ]

Example 2: To demonstrate 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);        }    }}
Original ByteBuffer: [ 23  34  27  ]

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

Example 3: To demonstrate 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);        }    }}
Trying to put the int value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException

Reference:
https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putInt-int-
https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putInt-int-int-
Java-ByteBuffer
Java-Functions
Java-NIO package
Java
Java
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