public String firstAndLast(String str) { //declare and create your first char   //declare and create your second char   //return your first and last char as a String      }

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A: To write java program to display number of 'e' in the given text from user.

Q: In this lab, you use what you have learned about searching an array to find an exact match to…

A: #include <iostream>#include <string>using namespace std; int main() {   string…

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A: Instruction we need to follow: The program should ask for the data to fill a studentRec of structure…

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A: Solution:   Given, Write a function that accepts a string and returns a string in which the…

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Q: java.io.BufferedReader; import java.io.FileReader;

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.