java important problems

Question 09

What is the output of the following

System.out.println("toLowerrCase(B) is " + Character.toLowerCase('B'));

Output

Output is

toLowerrCase(B) is b

Question 10

What is the output of the following

System.out.println("toUpperrCase(a) is " + Character.toUpperCase('a'));

Output

Output is

toUpperrCase(a) is A

Question 11

What is the output of the following

char x = 'w';

char y = 'p';

System.out.println(++x);

System.out.println(y++);

System.out.println(x + y);

Output

Output is:

x

p

233

Question 12

What is the output of the following

char x = 'w';

char y = 'p';

y++;

x+=2;

System.out.println(Character.toUpperCase(y));

System.out.println(Character.toUpperCase(x));

System.out.println(x * y);

Output

Output is

Q

Y

13673

Question 13

What is the output of the following

char x = 'w';

char y = 'D';

y++;

x+=2;

if(Character.isUpperCase(y))  {

System.out.println(Character.toUpperCase(y));

System.out.println(Character.toUpperCase(x)); }

else

System.out.println(x * y);

Output

Output is

E

Y

Question 14

What is the output of the following

System.out.println('H' <= 'P');

System.out.println('a' == 'd');

System.out.println('O' >= 's');

System.out.println('d' >= 'A');

System.out.println('a' == 'a');

System.out.println('V' != 'b');

Output

Output is

true

false

false

true

true

true

jav important problems for exams

Question 03

What is the output of the following

System.out.println("isDigit('r') is " + Character.isDigit('r'));

Output

Output is

isDigit('r') is false

Question 04

What is the output of the following:

System.out.println("isDigit(3) is " + Character.isDigit('3'));

Output

Output is

isDigit(3) is true

Question 05

What is the output of the following:

System.out.println("isupperCase(w) is " + Character.isUpperCase('w'));

Output

Output is

isupperCase(w) is false

Question 06

What is the output of the following:

System.out.println("isupperCase(P) is " + Character.isUpperCase('P'));

Output

Output is

isupperCase(P) is true

Question 07

What is the output of the following:

System.out.println("isLowerrCase(P) is " + Character.isLowerCase('P'));

Output

Output is

isLowerrCase(P) is false

Question 08

What is the output of the following

System.out.println("isLowerrCase(z) is " + Character.isLowerCase('z'));

Output

Output is

isLowerrCase(z) is true

java important input output problems

Question 01

What is the output of the following:

System.out.println("1" + 1);

System.out.println('1' + 1);

System.out.println("1" + 1 + 1);

System.out.println("1" + (1 + 1));

System.out.println('1' + 1 + 1);

Output

Output is 11

                  50

                   111

                    12

                   51

Question 02

What is the output of the following:

System.out.println("1" + 1+3);

System.out.println('1' + 1*3);

System.out.println("1" + 1 *4+4+ 1);

System.out.println("1" + 4+(1 + 1));

System.out.println('1' + (1+3) + 1);

 }

Output

Output is

113

52

1441

142

54

java methods

Question 30

What is equals()

 Ans

It compare two strings and it is case sensitive

Question 31

What is equalsIgnoreCase()

 Ans

This function compare two strings but it is not case sensitive.

Question 32

Give example of equals()

 Ans

String s1="this4is4my4book";

String s2="this4is4my4book";

String s3="lkajfslagj;fklgja";

System.out.println(s1.equals(s2));  //true

 System.out.println(s3.equals(s2));  //false

Question 33

Give example of equalsIgnoreCase()

 Ans

String s1="thIs4is4My4book";

String s2="This4is4my4Book";

String s3="lkajfslagj;fklgja";

System.out.println(s1.equalsIgnoreCase(s2));  //true

 System.out.println(s3.equals(s2));               // false