String

Question 1

String to char array
char at specific location ??
index of specific char ??
last occurrence of specific char ??
if char is a digit ?

Answer 1

toCharArray()
charAt(index)
indexOf(char c)
lastIndexOf(char ch)
Character.isDigit(char ch)

Question 2

Ascii number starting from ‘A’ - ‘Z’

Ascii number starting for ‘a’ - ‘z’

Answer 2

65-90

97-122

Question 3

Character addition
char methods to check if char is numeric ?
method to get numeric value of a char

Answer 3

will give ascii number addition of chars.
- Character.isDigit(c)
- c - ‘0’ -> gives int
Character.getNumericValue(c)

Question 4

Comparator

Answer 4

compare(a,b)
if a > b return positive integer
A < b , negative integer
A== b , 0

Question 5

Adding element to specified location or first, last

Answer 5

LinkedList

Question 6

String contains digit

Answer 6

s.matches(.\d+.”)