Java Reference
In-Depth Information
Enter a genome string:
no gene is found
TGTGTGTATAT
*9.28
(
Calculator
) Revise Listing 9.5, Calculator.java, to accept an expression in which
the operands and operator are separated by zero or more spaces. For example,
3+4
and
3 + 4
are acceptable expressions.
*9.29
(
Business: check ISBN-13
)
ISBN-13
is a new standard for identifying topics. It
uses the 13 digits The last digit, is a check-
sum, which is calculated from the other digits using the following formula:
d
1
d
2
d
3
d
4
d
5
d
6
d
7
d
8
d
9
d
10
d
11
d
12
d
13
.
d
13
,
10
-
(
d
1
+
3
d
2
+
d
3
+
3
d
4
+
d
5
+
3
d
6
+
d
7
+
3
d
8
+
d
9
+
3
d
10
+
d
11
+
3
d
12
) % 10
If the checksum is
10
, replace it with
0
. Your program should read the input as a
string. Here are sample runs:
Enter the first 12 digits of an ISBN-13 as a string:
978013213080
The ISBN-13 number is 9780132130806
Enter the first 12 digits of an ISBN-13 as a string:
978013213079
The ISBN-13 number is 9780132130790
*9.30
(
Capitalize first letter of each word
) Write the following method that returns a
new string in which the first letter in each word is capitalized.
public static void
title(String s)
Write a test program that prompts the user to enter a string and invokes this
method, and displays the return value from this method. Here is a sample run:
Enter a string:
The new string is: London England 2015
london england 2015
Note that words may be separated by multiple blank spaces.
*9.31
(
Swap case
) Write the following method that returns a new string in which the
uppercase letters are changed to lowercase and lowercase letters are changed to
uppercase.
public static
String swapCase(String s)
Write a test program that prompts the user to enter a string and invokes this
method, and displays the return value from this method. Here is a sample run:
Enter a string:
The new string is: i'M HERE
I'm here
