Computer Applications
State the data type after the following is executed :
char ch = '9';
res = Character.isDigit(ch);
- int
- char
- string
- boolean
Java Library Classes
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Answer
boolean
Reason — isDigit() method returns true if the specified character is a digit; returns false otherwise. Thus, the return type is boolean.
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Related Questions
Read the following text and choose the correct answer:
Byte streams are used to perform input and output of 8-bytes. They are used to read bytes from the input stream and write bytes to the output stream. Mostly, they are used to read or write raw binary data.
Which of these class is used to read and write bytes in a file?
- FileReader
- FileWriter
- FileInputStream
- InputStreamReader
Assertion (A) The private access specifier achieves the lowest level of accessibility.
Reason (R) The private methods and fields can be accessed only within the same class to which the methods and fields belong.- Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
- Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion (A).
- Assertion (A) is true and Reason (R) is false.
- Assertion (A) is false and Reason (R) is true.
State the number of bytes and bits occupied by a character array of 20 elements.
If
String x = "Computer"; String y = "Science";What will the following return?
(a) System.out.print(x.substring(2,6));
(b) System.out.print(x.indexOf(x.charAt(5)));