Problem 1
State whether each of the following is true or false. If false, explain why. a) When String objects are compared using ==, the result is true if the Strings contain the same values. b) A String can be modified after it is created
Problem 2
For each of the following, write a single statement that performs the indicated task: a) Compare the string in s1 to the string in s2 for equality of contents. b) Append the string s2 to the string s1, using +=. c) Determine the length of the string in s1.
Problem 3
Write an application that uses String method compareTo to compare two strings input by the user. Output whether the first string is less than, equal to or greater than the second.
Problem 4
Write an application that uses String method regionMatches to compare two strings input by the user. The application should input the number of characters to be compared and the starting index of the comparison. The application should state whether the strings are equal. Ignore the case of the characters when performing the comparison.
Problem 9
(Pig Latin) Write an application that encodes English-language phrases into pig Latin. Pig Latin is a form of coded language. There are many different ways to form pig Latin phrases. For simplicity, use the following algorithm: To form a pig Latin phrase from an English-language phrase, tokenize the phrase into words with an object of class StringTokenizer. To translate each English word into a pig Latin word, place the first letter of the English word at the end of the word and add the letters “ay.” Thus, the word “jump” becomes “umpjay,” the word “the” becomes “hetay,” and the word “computer” becomes “omputercay.” Blanks between words remain as blanks. Assume the following: The English phrase consists of words separated by blanks, there are no punctuation marks and all words have two or more letters. Method printLatinWord should display each word. Each token returned from nextToken is passed to method printLatinWord to print the pig Latin word. Enable the user to input the sentence. Keep a running display of all the converted sentences in a textarea.
Problem 10
Write an application that inputs a telephone number as a string in the form (555) 555-5555. The application should use an object of class StringTokenizer to extract the area code as a token, the first three digits of the phone number as a token and the last four digits of the phone number as a token. The seven digits of the phone number should be concatenated into one string. Both the area code and the phone number should be printed. Remember that you will have to change delimiter characters during the tokenization process.
Problem 11
Write an application that inputs a line of text, tokenizes the line with an object of class StringTokenizer and outputs the tokens in reverse order. Use space characters as delimiters.
Problem 13
Write an application that inputs a line of text and outputs the text twice -once in all uppercase letters and once in all lowercase letters.
Problem 14
Write an application that inputs a line of text and a search character and uses String method indexof to determine the number of occurrences of the character in the text.
Problem 16
Write an application that reads a line of text, tokenizes the line using space characters as delimiters and outputs only those words beginning with the letter "b".
