test/java/io/SystemInAvailable.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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/* @test
   @bug 4135795
   @summary Make sure that System.in.available() works
            when System.in is the keyboard
   @run ignore This test requires console (/dev/tty) input, which is not
               supported by the current harness
 */


import java.io.*;

public class SystemInAvailable {

    public static void main(String[] args) throws Exception {
        byte[] b = new byte[1024];
        System.out.print("Press <enter>: ");
        System.out.flush();
        System.in.read(b);
        int a = System.in.available();
        if (a != 0) throw new Exception("System.in.available() ==> " + a);
    }

}