How to read input from console with Java
In this tutorial we show you how to read input from console with Java.
java.io.BufferedReaderwrapped in ajava.io.InputStreamReaderjava.util.Scanner
BufferedReader wrapped in a InputStreamReader
The System.in is the standard input stream this stream is default open and is typically used for keyboard input. We wrap the stream in a InputStreamReader which reads the stream by the specified charset. Then we wrap this stream in a BufferedReader which’ll read line until the text equals to “goodbye”. The readLine() method can throw a IOException.
package com.memorynotfound;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ReadConsoleSystem {
public static void main(String[] args) throws IOException {
String text;
BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in, Charset.forName("UTF-8")));
System.out.println("Enter input: ");
do {
text = bufferRead.readLine();
System.out.println("response: " + text);
} while (!"goodbye".equalsIgnoreCase(text));
}
}java.util.Scanner
Personally I prefer the java.util.Scanner class. The nextLine() method does not throw a CheckedException. And is much more intuitive to use. The java.util.Scanner class was introduced in JDK 1.5.
package com.memorynotfound;
import java.util.Scanner;
public class ReadConsoleScanner {
public static void main(String[] args) {
Scanner scanIn = new Scanner(System.in);
String text;
System.out.println("Enter input: ");
do {
text = scanIn.nextLine();
System.out.println("response: " + text);
} while (!"goodbye".equalsIgnoreCase(text));
scanIn.close();
}
}Read input from console example output
Both applications do the same thing, here is a sample output.
Enter input:
Can you tell me how to read input from console?
response: Can you tell me how to read input from console?
No
response: No
Goodbye
response: Goodbye
