Prerequisite : Basics of Strings class in java
1. What is the Output Of the following Program
Output:
java
java programming
2. What is the Output Of the following Program
Output:
java programming
java programming
3. What is the Output Of the following Program
Output:
abcde
Explanation:
The constructor String( byte[] ) converts the bytes to corresponding characters i.e. 97 converted to character 'a'
4. What is the Output Of the following Program
Output:
v
Explanation:
charAt() function returns the character at the specified index.
5. What is the Output Of the following Program
Output:
Java
Explanation:
The syntax of the method is: getChars(startindex, numOfCharacters, arrayName, startindexOfArrat). So from the string, starting from 0th index, first four characters are taken.
6. What is the Output Of the following Program
Output:
Java Programming
Explanation:
toCharArray() method converts the string into a character array.
7. What is the Output Of the following Program
Output:
Equal Case 1
Equal Case 2
Explanation:
The equals() method compares the characters inside a String object.Thus str.equals(str1) comes out to be true.
The == operator compares two object references to see whether they refer to the same instance. Now str points to "Java Programming" and then str1 also points to "Java Programming", hence str == str1 is also true.
8. What is the Output Of the following Program
Output:
Same
Explanation:
The syntax of the function is: regionMatches( startIndex, stringS, stringS's_startIndex, numOfCharacters)
so starting from index 5, string str1 is compared from index 0 till 11 characters only.
Hence output is 'Same'
9. What is the Output Of the following Program
Output:
Start Same
Explanation:
The startsWith() method determines whether a given String begins with a specified string.
The endsWith() determines whether the String in question ends with a specified string.
10. What is the Output Of the following Program
Output:
11
-11
Explanation:
The String method compareTo( ) serves the purpose of comparing two strings. Whether one string is less than, greater than or equal to the second string.
In case 1, comparing JavaProgramming with Java implies JavaProgramming is greater than Java by 11 characters.
In case 2, comparing Java with JavaProgramming implies Java is lesser than JavaProgramming by 11 characters (-11).
11. What is the Output Of the following Program
Output:
1
11
10
12
Explanation:
indexOf( ) Searches for the first occurrence of a character or substring. lastIndexOf( ) Searches for the last occurrence of a character or substring.
12. What is the Output Of the following Program
Output:
Programming
Prog
Explanation:
constructor substring(int startIndex) takes the substring starting from the specified index till end of the string
constructor substring(int startIndex, int endIndex) takes the substring from startIndex to endIndex-1
13. What is the Output Of the following Program
Output:
J9v9 Progr9mming
Explanation:
The replace( ) method replaces all occurrences of one character in the invoking string with another character.
Hence 'a' replaced with a '9'.
14. What is the Output Of the following Program
Output:
JavaProgramming
Explanation:
concat() method simply concatenates one string to the end of the other.
15. What is the Output Of the following Program
Output:
Java Programming
Explanation:
The trim( ) method returns a copy of the invoking string from which any leading and trailing whitespace has been removed. But it does not remove the spaces present between two words.
