ByteBuffer getFloat() method in Java with Examples - GeeksforGeeks

17 Jun, 2019
The getFloat() method of java.nio.ByteBuffer class is used to read the next four bytes at this buffer’s current position, composing them into a float value according to the current byte order, and then increments the position by four.
Syntax:
public abstract float getFloat()
Return Value: This method returns the float value at the buffer’s current position.
Exception: This method throws BufferUnderflowException if there are fewer than four bytes remaining in this buffer.
Below are the examples to illustrate the getFloat() method:
Examples 1:
// Java program to demonstrate// getFloat() method  import java.nio.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the capacity of the ByteBuffer        int capacity = 8;          // Creating the ByteBuffer        try {              // creating object of ByteBuffer            // and allocating size capacity            ByteBuffer bb = ByteBuffer.allocate(capacity);              // putting the double value in the bytebuffer            bb.asFloatBuffer()                .put(12.3f)                .put(28.44f);              // rewind the Bytebuffer            bb.rewind();              // print the ByteBuffer            System.out.println("Original ByteBuffer: ");            for (int i = 1; i <= capacity / 4; i++)                System.out.print(bb.getFloat() + " ");              // rewind the Bytebuffer            bb.rewind();              // Reads the Float at this buffer's current position            // using getFloat() method            float value = bb.getFloat();              // print the float value            System.out.println("\n\nByte Value: " + value);              // Reads the  float at this buffer's next position            // using getFloat() method            float value1 = bb.getFloat();              // print the float value            System.out.print("\nNext Byte Value: " + value1);        }          catch (BufferUnderflowException e) {              System.out.println("\nException Thrown : " + e);        }    }}
Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

Next Byte Value: 28.44

Examples 2:
// Java program to demonstrate// getFloat() method  import java.nio.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the capacity of the ByteBuffer        int capacity = 8;          // Creating the ByteBuffer        try {              // creating object of ByteBuffer            // and allocating size capacity            ByteBuffer bb = ByteBuffer.allocate(capacity);              // putting the double value in the bytebuffer            bb.asFloatBuffer()                .put(12.3f)                .put(28.44f);              // rewind the Bytebuffer            bb.rewind();              // print the ByteBuffer            System.out.println("Original ByteBuffer: ");            for (int i = 1; i <= capacity / 4; i++)                System.out.print(bb.getFloat() + " ");              // rewind the Bytebuffer            bb.rewind();              // Reads the Float at this buffer's current position            // using getFloat() method            float value = bb.getFloat();              // print the float value            System.out.println("\n\nByte Value: " + value);              // Reads the  float at this buffer's next position            // using getFloat() method            float value1 = bb.getFloat();              // print the float value            System.out.println("\nNext Byte Value: " + value1);              // Reads the  float at this buffer's next position            // using getFloat() method            float value2 = bb.getFloat();        }          catch (BufferUnderflowException e) {            System.out.println("\nthere are fewer "                               + "than eight bytes remaining"                               + " in this buffer");            System.out.println("Exception Thrown : " + e);        }    }}
Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

Next Byte Value: 28.44

there are fewer than eight bytes remaining in this buffer
Exception Thrown : java.nio.BufferUnderflowException

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getFloat–
The getFloat(int index) method of java.nio.ByteBuffer is used to read four bytes at the given index, composing them into a float value according to the current byte order.
Syntax:
public abstract float getFloat(int index)
Parameters: This method takes index as parameter which is the index from which the Byte will be read.
Return Value: This method returns the float value at the given index.
Exception: This method throws IndexOutOfBoundsException if index is negative or not smaller than the buffer’s limit.
Below are the examples to illustrate the getFloat(int index) method:
Examples 1:
// Java program to demonstrate// getFloat() method  import java.nio.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the capacity of the ByteBuffer        int capacity = 8;          // Creating the ByteBuffer        try {              // creating object of ByteBuffer            // and allocating size capacity            ByteBuffer bb = ByteBuffer.allocate(capacity);              // putting the double value in the bytebuffer            bb.asFloatBuffer()                .put(12.3f)                .put(28.44f);              // rewind the Bytebuffer            bb.rewind();              // print the ByteBuffer            System.out.println("Original ByteBuffer: ");            for (int i = 1; i <= capacity / 4; i++)                System.out.print(bb.getFloat() + " ");              // rewind the Bytebuffer            bb.rewind();              // Reads the Float at this buffer's current position            // using getFloat() method            float value = bb.getFloat(0);              // print the float value            System.out.println("\n\nByte Value: " + value);              // Reads the  float at this buffer's next position            // using getFloat() method            float value1 = bb.getFloat(4);              // print the float value            System.out.println("\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);        }    }}
Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

Next Byte Value: 28.44

Examples 2:
// Java program to demonstrate// getFloat() method  import java.nio.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the capacity of the ByteBuffer        int capacity = 8;          // Creating the ByteBuffer        try {              // creating object of ByteBuffer            // and allocating size capacity            ByteBuffer bb = ByteBuffer.allocate(capacity);              // putting the double value in the bytebuffer            bb.asFloatBuffer()                .put(12.3f)                .put(28.44f);              // rewind the Bytebuffer            bb.rewind();              // print the ByteBuffer            System.out.println("Original ByteBuffer: ");            for (int i = 1; i <= capacity / 4; i++)                System.out.print(bb.getFloat() + " ");              // rewind the Bytebuffer            bb.rewind();              // Reads the Float at this buffer's current position            // using getFloat() method            float value = bb.getFloat(0);              // print the float value            System.out.println("\n\nByte Value: " + value);              // Reads the  float at this buffer's next position            // using getFloat() method            float value1 = bb.getFloat(6);              // print the float value            System.out.println("\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);        }    }}
Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

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

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