Lab Letter Name CSE 110 Lab 3 Objects and Classes in Java La

Lab Letter: Name: CSE 110 Lab 3: Objects and Classes in Java Lab Exercise Complete this portion ofthe lab during our lab session. 1, String Manipulation: 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 .java Test several methods for manipulating String objects import j ava .util Scanner public class StringManips public static void main String args) String phrase new String (\"Programming is fun int phraselength: number of characters in the phrase string int middle Index: index of the middle character in the String first half of the phrase string String firstHalf string secondHalf: second half of the phrase string String switched Phrase: a new phrase with original halves switched compute the length and middle index of the phrase phraselength phrase length /1----- Statement 1 middle Index phraselength 2: get the substring for each half of the phrase first Half phrase. substring (C,middleIndex) statement 2 second Half phrase. substring (middle Index, phraseLength) Statement 3 concatenate the first Half at the end of the secondlalf second Half concat (first llal Statement 4 switched Phrase print information about the phrase system. out printin (1 original phrase Systems out.println phrase)

Solution

Here is the code explained as comments after each statement:

import java.util.Scanner;
public class StringManips
{
public static void main(String[] args)
{
String phrase = new String(\"Programming is fun.\");   //Initializes a string.
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();   //Statement 1.
//This assigns the length of the phrase to the variable phraseLength.
//Therefore, after executing this block, phraseLength will be assigned a value of 19.
  
middleIndex = phraseLength / 2;
  
//get the substring for each half of the phrase.
firstHalf = phrase.substring(0, middleIndex);   //Statement 2.
//This assigns the first half of the phrase string to the variable firstHalf.
//Note that middleIndex value is 19 / 2 = 9.
//Starting from index 0,upto 9-1, i.e., till index 8.
//And therefore, firstHalf is assigned the value: Programmi
  
secondHalf = phrase.substring(middleIndex, phraseLength);   //Statement 3.
//This assigns the second half of the phrase string to the variable secondHalf.
//Starting from index 9, upto 19-1, i.e., till index 18.
//As the middleIndex value is 9, the secondHalf is assigned a value: ng is fun.
  
//concatenate the firstHalf at the end of the secondHalf
switchedPhrase = secondHalf.concat(firstHalf);   //Statement 4.
//This assigns the firstHalf concatenated(appended to the right of) to the firstHalf.
//Therefore, switchedPhrase is assigned a value ng is fun.Programmi
  
//print information about the phrase
System.out.println();   //Leaves an empty line.
System.out.println(\"Original phrase: \" + phrase);   //Prints the string in phrase, i.e., \"Programming is fun.\"
System.out.println(\"Length of the phrase: \" + phraseLength + \" characters\");   //Prints the length of phrase, i.e., 19.
System.out.println(\"Index of the middle: \" + middleIndex);   //Print the middleIndex value, i.e., 9.
System.out.println(\"Character at the middle index: \" + phrase.charAt(middleIndex));   //Statement 5.
//This prints the character at index middleIndex in the string phrase.
//phrase holds \"Programming is fun.\", and the middleIndex holds the value of 9.
//So, the output this statement is: Character at the middle index: n
  
System.out.println(\"Switched phrase: \" + switchedPhrase); //Prints the string in switchedPhrase, i.e., ng is fun.Programmi
System.out.println();
}
}