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CharBuffer get() methods in Java

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  • Last Updated : 22 Jul, 2019
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The get() method of java.nio.CharBuffer Class is used to reads the char at the given buffer’s current position, and then increments the position.

Syntax:

public abstract char get()

Return Value: This method returns the char value at the buffer’s current position.

Exceptions: This method throws BufferUnderflowException – If the buffer’s current position is not smaller than its limit, then this exception is thrown.

Below are the examples to illustrate the get() method:

Example 1:




// Java program to demonstrate
// get() method
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the CharBuffer
        int capacity = 5;
  
        // Creating the CharBuffer
        try {
  
            // creating object of Charbuffer
            // and allocating size capacity
            CharBuffer cb = CharBuffer.allocate(capacity);
  
            // putting the value in Charbuffer
            cb.put('a');
            cb.put('b');
            cb.put('c');
            cb.rewind();
  
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb.array()));
  
            // Reads the Int at this buffer's current position
            // using get() method
            char value = cb.get();
  
            // print the Int value
            System.out.println("Int Value: " + value);
  
            // Reads the Int at this buffer's next position
            // using get() method
            char value1 = cb.get();
  
            // print the Int value
            System.out.print("Next Int Value: " + value1);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("ReadOnlyBufferException catched");
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("Exception throws: " + e);
        }
    }
}


Output:

Original CharBuffer: [a, b, c, , ]
Int Value: a
Next Int Value: b

Examples 2:




// Java program to demonstrate
// get() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the CharBuffer
        int capacity = 3;
  
        // Creating the CharBuffer
        try {
  
            // creating object of Charbuffer
            // and allocating size capacity
            CharBuffer cb = CharBuffer.allocate(capacity);
  
            // putting the value in Charbuffer
            cb.put('a');
            cb.put('b');
  
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb.array()));
  
            // Reads the Char at this buffer's current position
            // using get() method
            char value = cb.get();
  
            // print the Char value
            System.out.println("Char Value: " + value);
  
            // Reads the Char at this buffer's next position
            // using get() method
            System.out.print("Since the buffer current position is incremented\n");
            System.out.print(" to greater than its limit ");
  
            char value1 = cb.get();
  
            // print the Char value
            System.out.print("Next Char Value: " + value1);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("ReadOnlyBufferException catched");
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("Exception throws : " + e);
        }
    }
}


Output:

Original CharBuffer: [a, b, ]
Char Value: 
Since the buffer current position is incremented
to greater than its limit Exception throws : java.nio.BufferUnderflowException

get(int index)

The get(int index) method of CharBuffer is used to read the article at a specified index.

Syntax :

public abstract char get(int index)

Parameters: This method takes index (The index from which the char will be read) as a parameter.

Return Value: This method returns the char value at the given index.

Exception: This method throws IndexOutOfBoundsException. If index is negative or not smaller than the buffer’s limit this exception is thrown.

Below are the examples to illustrate the get(int index) method:

Examples 1:




// Java program to demonstrate
// get(int index) method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the CharBuffer
        int capacity = 3;
  
        // Creating the CharBuffer
        try {
  
            // creating object of Charbuffer
            // and allocating size capacity
            CharBuffer cb = CharBuffer.allocate(capacity);
  
            // putting the value in Charbuffer
            cb.put('a');
            cb.put('b');
            cb.put('c');
  
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb.array()));
  
            // Reads the Char at the index 0 of the Charbuffer
            // using get() method
            char value0 = cb.get(0);
  
            // print the Char value
            System.out.println("Char Value at index 0: " + value0);
  
            // Reads the Char at the index 1 of the Charbuffer
            // using get() method
            char value1 = cb.get(1);
  
            // print the Char value
            System.out.println("Char Value at index 1: " + value1);
  
            // Reads the Char at the index 2 of the Charbuffer
            // using get() method
            char value2 = cb.get(2);
  
            // print the Char value
            System.out.println("Char Value at index 2: " + value2);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (IndexOutOfBoundsException e) {
  
            System.out.println("ReadOnlyBufferException catched");
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("Exception throws : " + e);
        }
    }
}


Output:

Original CharBuffer: [a, b, c]
Char Value at index 0: a
Char Value at index 1: b
Char Value at index 2: c

Examples 2:




// Java program to demonstrate
// get() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the CharBuffer
        int capacity = 3;
  
        // Creating the CharBuffer
        try {
  
            // creating object of Charbuffer
            // and allocating size capacity
            CharBuffer cb = CharBuffer.allocate(capacity);
  
            // putting the value in Charbuffer
            cb.put('a');
            cb.put('b');
            cb.put('c');
  
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb.array()));
  
            // Reads the Char at the index 0 of the Charbuffer
            // using get() method
            char value0 = cb.get(0);
  
            // print the Char value
            System.out.println("Char Value at index 0: " + value0);
  
            // Reads the Char at the index 1 of the Charbuffer
            // using get() method
            char value1 = cb.get(1);
  
            // print the Char value
            System.out.println("Char Value at index 1: " + value1);
  
            // Reads the Char at the index 2 of the Charbuffer
            // using get() method
            System.out.println("Trying to get the Char"
                               + " of index greater than its limit ");
            char value2 = cb.get(4);
  
            // print the Char value
            System.out.println("Char Value at index 2: " + value2);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (IndexOutOfBoundsException e) {
  
            System.out.println("Exception thrown: " + e);
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("Exception throws : " + e);
        }
    }
}


Output:

Original CharBuffer: [a, b, c]
Char Value at index 0: a
Char Value at index 1: b
Trying to get the Char of index greater than its limit 
Exception thrown: java.lang.IndexOutOfBoundsException

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