CharBuffer get() methods in Java

Last Updated : 22 Jul, 2019
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 
// 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 
// 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 
// 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 
// 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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