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PushbackReader ready() method in Java with Examples

  • Last Updated : 29 Apr, 2019

The ready() method of PushbackReader Class in Java is used to check whether this PushbackReader is ready to be read or not. It returns a boolean which states if the reader is ready.

Syntax:

public void ready()

Parameters: This method does not accepts any parameters

Return Value: This method returns a boolean value which tells if this PushbackReader is ready to be read or not. It return true if it is ready. Else it returns false.

Exception: This method throws IOException if some error occurs while input-output.

Below methods illustrates the working of ready() method:

Program 1:




// Java program to demonstrate
// PushbackReader ready() method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
            // Initializing a StringReader
            // and PushbackReader
            String s = "GeeksForGeeks";
  
            StringReader stringReader
                = new StringReader(s);
            PushbackReader pushbackReader
                = new PushbackReader(stringReader);
  
            // Check if the PushbackReader is
            // ready to be read using ready()
            System.out.println("Is PushbackReader ready "
                               + "to be read: "
                               + pushbackReader.ready());
  
            // Close the stream using ready()
            pushbackReader.close();
            System.out.println("Stream Closed.");
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}
Output:
Is PushbackReader ready to be read: true
Stream Closed.

Program 2:




// Java program to demonstrate
// PushbackReader ready() method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
            // Initializing a StringReader
            // and PushbackReader
            String s = "GFG";
  
            StringReader stringReader
                = new StringReader(s);
            PushbackReader pushbackReader
                = new PushbackReader(stringReader);
  
            // Check if the PushbackReader is
            // ready to be read using ready()
            System.out.println("Is PushbackReader ready "
                               + "to be read: "
                               + pushbackReader.ready());
  
            // Close the stream
            pushbackReader.close();
            System.out.println("Stream Closed.");
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}
Output:
Is PushbackReader ready to be read: true
Stream Closed.

Reference: https://docs.oracle.com/javase/9/docs/api/java/io/PushbackReader.html#ready–

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