Java IO and Applets Mcqs
Our collections of Multiple choice questions and answers focuses on study of Java IO and Applets . These questions are chosen from a collection of most authoritative and best reference books on Java. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams and various tests and job interviews. One should practice our Mcqs to assimilate Java IO and Applets topic comprehensively.
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2. Which of these class is implemented by FilterInputStream class?
4. What is the output of this 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);
}
}
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);
}
}
5. Which of these class contains the methods print() & println()?
6. Which of these methods can be used to writing console output?
7. Which of these classes are used by character streams output operations?
8. Which of these class is used to read from a file?
9. What is the output of this program?
class output
{
public static void main(String args[])
{
String a="hello i love java";
System.out.println(indexof('i')+" "+indexof('o')+" "+lastIndexof('i')+" "+lastIndexof('o') ));
}
}
class output
{
public static void main(String args[])
{
String a="hello i love java";
System.out.println(indexof('i')+" "+indexof('o')+" "+lastIndexof('i')+" "+lastIndexof('o') ));
}
}
10. What is the output of this program?
class output
{
public static void main(String args[])
{
char c[]={'a','1','b',' ','A','0'];
for (int i = 0; i < 5; ++i)
{
if(Character.isDigit(c[i]))
System.out.println(c[i]" is a digit");
if(Character.isWhitespace(c[i]))
System.out.println(c[i]" is a Whitespace character");
if(Character.isUpperCase(c[i]))
System.out.println(c[i]" is an Upper case Letter");
if(Character.isUpperCase(c[i]))
System.out.println(c[i]" is a lower case Letter");
i = i + 3;
}
}
}
class output
{
public static void main(String args[])
{
char c[]={'a','1','b',' ','A','0'];
for (int i = 0; i < 5; ++i)
{
if(Character.isDigit(c[i]))
System.out.println(c[i]" is a digit");
if(Character.isWhitespace(c[i]))
System.out.println(c[i]" is a Whitespace character");
if(Character.isUpperCase(c[i]))
System.out.println(c[i]" is an Upper case Letter");
if(Character.isUpperCase(c[i]))
System.out.println(c[i]" is a lower case Letter");
i = i + 3;
}
}
}
11. What is the output of this program?
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello");
StringBuffer s2 = s1.reverse();
System.out.println(s2);
}
}
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello");
StringBuffer s2 = s1.reverse();
System.out.println(s2);
}
}
