Reading Console Input - Java Questions & Answers

This section of our 1000+ Java MCQs focuses on reading console inputs in Java Programming Language.

1. Which exception is thrown by read() method?
a) IOException
b) InterruptedException
c) SystemException
d) SystemInputException
View Answer

Answer: a
Explanation: read method throws IOException.

2. Which of these is used to read a string from the input stream?
a) get()
b) getLine()
c) read()
d) readLine()
View Answer

Answer: c
Explanation: None.

3. Which of these class is used to read characters and strings in Java from console?
a) BufferedReader
b) StringReader
c) BufferedStreamReader
d) InputStreamReader
View Answer

Answer: a
Explanation: None.

4. Which of these class is implemented by FilterInputStream class?
a) InputStream
b) InputOutputStream
c) BufferedInputStream
d) SequenceInputStream
View Answer

Answer: a
Explanation: FileInputStream implements InputStream.

5. What will be the output of the following Java program if input given is “Hello stop World”?

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```
    class Input_Output 
```
```
    {
```

        public static void main(String args[]) throws IOException

```
        {	 
```
```
            string str;
```

            BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));

```
            do
```
```
            {
```

                str = (char) obj.readLine();

```
	        System.out.print(str);
```

            } while(!str.equals("strong"));

```
        }
```
```
    }
```

a) Hello
b) Hello stop
c) World
d) Hello stop World
View Answer

Answer: d
Explanation: “stop” will be able to terminate the do-while loop only when it occurs singly in a line. “Hello stop World” does not terminate the loop.
Output:

$ javac Input_Output.java
$ java Input_Output
Hello stop World

6. What will be the output of the following Java program?

```
    class output
```
```
    {
```

        public static void main(String args[])

```
        { 
```

             StringBuffer c = new StringBuffer("Hello");

             StringBuffer c1 = new StringBuffer(" World");

```
             c.append(c1);
```
```
             System.out.println(c);
```
```
        }
```
```
    }
```

a) Hello
b) World
c) Helloworld
d) Hello World
View Answer

Answer: d
Explanation: append() method of class StringBuffer is used to concatenate the string representation to the end of invoking string.
Output:

$ javac output.java
$ java output
Hello World

7. What will be the output of the following Java program?

```
    class output
```
```
    {
```

        public static void main(String args[])

```
        { 
```

           StringBuffer s1 = new StringBuffer("Hello");

```
           s1.setCharAt(1,x);
```
```
           System.out.println(s1);
```
```
        }
```
```
    }
```

a) xello
b) xxxxx
c) Hxllo
d) Hexlo
View Answer

Answer: c
Explanation: None.
Output:

$ javac output.java
$ java output
Hxllo

8. What will be the output of the following Java program if input given is “abc’def/’egh”?

```
    class Input_Output
```
```
    {
```

        public static void main(String args[]) throws IOException

```
        {	 
```
```
            char c;
```

            BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));

```
            do
```
```
            {
```
```
                c = (char) obj.read();
```
```
	        System.out.print(c);
```
```
            } while(c != '\'');
```
```
        }
```
```
    }
```

a) abc’
b) abcdef/’
c) abc’def/’egh
d) abcqfghq
View Answer

Answer: a
Explanation: \’ is used for single quotes that is for representing ‘ .
Output:

$ javac Input_Output.java
$ java Input_Output
abc'

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