This is basic java problem Working with Strings The following program illustrate

Question

This is basic java problem

Working with Strings

The following program illustrates the use of some of the methods in the String class. Study the program to see what it is doing.

// ***************************************************************

// StringManips.j ava

//

// Test several methods for manipulating String objects

// ***************************************************************

import java.util.Scanner;

public class StringManips

{

public static void main (String[] args)

{

String phrase = new String ("This is a String test.");

int phraseLength; // number of characters in the phrase String

int middleIndex; // index of the middle character in the String

String firstHalf; // first half of the phrase String

String secondHalf; // second half of the phrase String

String switchedPhrase; //a new phrase with original halves switched

// compute the length and middle index of the phrase

phraseLength = phrase.length();

middleIndex = phraseLength / 2;

// get the substring for each half of the phrase

firstHalf = phrase.substring(0,middleIndex);

secondHalf = phrase.substring(middleIndex, phraseLength);

// concatenate the firstHalf at the end of the secondHalf

switchedPhrase = secondHalf.concat(firstHalf);

// print information about the phrase

System.out.println();

System.out.println ("Original phrase: " + phrase);

System.out.println ("Length of the phrase: " + phraseLength +

" characters");

System.out.println ("Index of the middle: " + middleIndex);

System.out.println ("Character at the middle index: " +

phrase.charAt(middleIndex));

System.out.println ("Switched phrase: " + switchedPhrase);

System.out.println();

}

}

The file StringManips.java contains this program. Save the file to your directory and compile and run it. Study the output and make sure you understand the relationship between the code and what is printed. Now modify the file as follows:

1. Declare a variable of type String named middle3 (put your declaration with the other declarations near the top of the program) and use an assignment statement and the substring method to assign middle3 the substring consisting of the

middle three characters of phrase (the character at the middle index together with the character to the left of that and the one to the right - use variables, not the literal indices for this particular string). Add a println statement to print out the

result. Save, compile, and run to test what you have done so far.

2. Add an assignment statement to replace all blank characters in switchedPhrase with an asterisk (*). The result should be stored back in switchedPhrase (so switchedPhrase is actually changed). (Do not add another print—place your statement in the program so that this new value of switchedPhrase will be the one printed in the current println statement.) Save, compile, and run your program.

3. Declare two new variables city and state of type String. Add statements to the program to prompt the user to enter their hometown—the city and the state. Read in the results using the appropriate Scanner class method - you will need to have

the user enter city and state on separate lines. Then using String class methods create and print a new string that consists of the state name (all in uppercase letters) followed by the city name (all in lowercase letters) followed again by the state name (uppercase). So, if the user enters Lilesville for the city and North Carolina for the state, the program should create and print the string

NORTH CAROLINAlilesvilleNORTH CAROLINA

Explanation / Answer

import java.util.Scanner; public class Deli { // --------------------------------------------------- // main reads in the price per pound of a deli item // and number of ounces of a deli item then computes // the total price and prints a "label" for the item // -------------------------------------------------- public static void main (String[] args) { final double OUNCES_PER_POUND = 16.0; double pricePerPound; // price per pound double weightOunces; // weight in ounces double weight; // weight in pounds double totalPrice; // total price for the item Scanner scan = new Scanner(System.in); // Declare money as a NumberFormat object and use the // getCurrencyInstance method to assign it a value // Declare fmt as a DecimalFormat object and instantiate // it to format numbers with at least one digit to the left of the // decimal and the fractional part rounded to two digits. // prompt the user and read in each input System.out.println ("Welcome to the CS Deli!! "); System.out.print ("Enter the price per pound of your item: "); pricePerPound = scan.nextDouble(); System.out.print ("Enter the weight (ounces): "); weightOunces = scan.nextDouble(); // Convert ounces to pounds and compute the total price weight = weightOunces / OUNCES_PER_POUND; totalPrice = pricePerPound * weight; // Print the label using the formatting objects // fmt for the weight in pounds and money for the prices } }

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