Java character class example questions

Q. Write a valid Java statement to convert ch = B’ into small letter and ml = ‘a’ into capital letter forms
Ans.

1. 1. To convert ch = ‘B’ into small letter the statement is:
      char st= Charaeter.toLowerCase( ch );
   2. To convert ml = „a’ into capital letter the statement is:
      char st= Character.toUpperCase( m1 );

Q. State the output of the following statements after the execution

1. 1. System.out.println (Character.isLowerCase (‘P’));
   2. System.out.println (Character.isDigit(‘s’));
   3. iii. System.out.println (Character.isUpperCase(‘R’));
   4. System.out.println (Character.isSpaceChar(‘ ‘));

Ans.

1. 1. False
   2. False
   3. True
   4. True

Q. A character ‘R’ is assigned to a character variable ans. Write valid statements to assign character ‘R’, convert into its ASCII code. Print the character and ASCII code.
Ans.

char ans = „R’; // initializing character R’ to character variable ans
int as = ans; // initializing character variable ‘ans’ to integer variable ‘as’ i.e. stores ASCII
System.out.println(“The character = “+ans +”its ASCII code = ” + as );

Q. Write a valid statement(s) to input a character from input/keyboard using read() method.
Ans. The character can be input from the keyboard using any of the methods given below:

1. 1. 1. Char ch= (char)System. in. read();
      2. BufferedReader br= new BufferedReader( new InputStreamReader( System.in);
         char ch= (char) br.read();

Q. State the Output of the following statements after the expression:

1. 1. System.out.println(Character.isDigit(‘g’));
   2. System.out.println(Character.isUpperCase(‘t’));
   3. System.out.println(Character.isWhitespace(‘\t ‘));
   4. System.out.println(Character.isLowerCase(‘m’));

Ans.

1. 1. false
   2. false
   3. true
   4. true

Q. Write the output of the following:

(i) System.out.println (Character.isUpperCase(‘D’));
(ii) System.out.println(Character.toUpperCase(‘l’));

Ans.

(i) true
(ii) L

Q. State the method that:

(i) Converts a string to a primitive float data type
(ii) Determines if the specified character is an uppercase character

Ans.

(i) Float.parseFloat()
(ii) Character.isUpperCase()

Q. State the data type and the value of y after the following is executed:

char x =‘5’;
t = Character.isLetter(x);

Ans. t is of boolean type its value is false.

Q. State the data type and value of res after the following is executed:

char ch=‘n’;
res=Character.toUpperCase(ch);

Ans. res is of char type is value is ‘N’.

Q. Write a statement to perform the following task on a string:

1. 1. Extract the second last character of a word stored in the variable wd.
   2. Cheek if the second character of a string str is in uppercase.

Ans.

1. 1. char ch = wd.charAt(wt.length() -2);
   2. if (Character.isUpperCase(str.charAt(1))) OR
      if (str.charAt(1)> ‘A ‘ && str.charAt(1) <= ‘z’)

Q. Write a valid Java statement to convert ch = ‘N’ into small letter and ml = ‘d’ into capital letter forms
Ans.

1. 1. To convert ch = ‘N’ into small letter the statement is:
      char st= Character.toLowerCase( ch );
   2. To convert ml = ‘d’ into capital letter the statement is:
      char st= Character.toUpperCase( m1 );

Q. State the output of the following statements after the execution

1. 1. System.out.println (Character.isLowerCase (‘A’));
   2. System.out.println (Character.isDigit(‘b’));
   3. System.out.println (Character.isUpperCase(‘T’));
   4. System.out.println (Character.isSpaceChar(‘ ‘));

Ans.

1. 1. False
   2. False
   3. True
   4. True

Q. Write a valid statement(s) to input a character from input/keyboard using read() method.
Ans. The character can be input from the keyboard using any of the methods given below:

1. 1. 1. Char ch= (char)System.in.read();
      2. BufferedReader br= new BufferedReader( new InputStreamReader( System.in);
         char ch= (char) br.read();