It extends Reader. A character stream whose source is a String.
StringReader enables you to turn an ordinary String into a Reader. This is useful if you have data as a String but need to pass that String to a component that only accepts a Reader.
Note: Since the StringReader is not using any underlying system resources like files or network sockets, closing the StringReader is not crucial.
Constructor
Methods
package com.java.io;
import java.io.IOException;
import java.io.StringReader;
public class StringReaderExample {
public static void main(String[] args) {
StringReader stringReader = null;
String str = "Reading String Data";
try {
stringReader = new StringReader(str);
// Check if markSupported by StringReader
System.out.println("Is Mark Supported:" + stringReader.markSupported());
if (stringReader.markSupported()) {
// marks the current position
// 100 characters to be read before the mark position becomes invalid
stringReader.mark(100);
}
// Skip 5 characters
stringReader.skip(5);
System.out.print("After Skip Content:");
// Checks if the stringReader is ready to be read
if (stringReader.ready()) {
for (int i = 0; i < 14; i++) {
// Reading one character at a time
System.out.print((char) stringReader.read());
}
}
System.out.println("");
// Reset to the earlier marked position
System.out.println("Reset to the earlier marked position");
stringReader.reset();
System.out.print("Reading characters into char Array:");
char c[] = new char[20];
if (stringReader.ready()) {
stringReader.read(c);
for (int i = 0; i < 20; i++) {
System.out.print(c[i]);
}
}
} catch (IOException ex) {
ex.printStackTrace();
} finally {
// Closing the streams
if (stringReader != null)
stringReader.close();
}
}
}Is Mark Supported:true
After Skip Content:ng String Data
Reset to the earlier marked position
Reading characters into char Array:Reading String Data