Given the following Java code:String str1 = “Java is useful!”;String str2= “Java is cool”; write the result of to each of the following questions:write a Java expression that compares if str1 is equal to str2write a Java expression that displays string str1
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Working with strings, which are used to store and alter text, is common while writing Java code. While working with strings in Java, you could conduct two typical operations: string comparisons and string printing. In this situation, you can be requested to create Java expressions that display a string on the console or compare two strings. Writing a Java expression that compares two strings and another expression that shows a specific string are required in this question.
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- Given the following Java code: String str1 = “Java is useful!”; String str2= “Java is cool”; write the result of to each of the following questions: str1.charAt(15) str1.substring(2, 9)Given the following Java code: String str1 = “Java is useful!”; String str2= “Java is cool”; write the result of to each of the following questions a). str1.length() b). str1. charAt(0) c). str1.charAt(14)Write a Java regular expression for each of the following: a. Phone numbers, such as (609) 555-1234 b. Social Security numbers, such as 123-45-6789 c. Dates, such as December 31, 1999
- The following question is requested to be in Java:Write a piece of Java code that will have a loop that counts the number of space characters that appear in the String object str.In Java, If a = 4; and b = 3;,then after the statement a = b; executes, the value of b is 4 and the value of a is 3. True or False3. Write a Java program that takes the user to provide a single character from the alphabet. Print Vowel or Consonant, depending on the user input. If the user input is not a letter (between a and z or A and Z), or is a string of length > 1, print an error message.4. Write a program in Java to input 5 numbers from keyboard and find their sum and average.
- Decidewhich of the following statements is either true or false and re-correct the false ones.1. The value of the following logical expression is true (1 + 2 == 2) || (4 - 4 == 0)2. In Java, once a variable is declared, it will be visible and could be used anywhere in theprogram.3. Strings are primitive data type in Java.4. In Java, we can initialize a variable during its declaration.5. do ... while repetition statement gives full control on the code block to be repeated.6. All binary operators except for the assignment operators are evaluated from Left to Right7. A ragged 2D array is a 2D array in which each column may contain different number of rows.8. Each row in a 2D array could be dealt with as 1D array.9. The following statement creates and initializes the array x:int x[] = {10, 20, 30, 40, 50};10. A Java program may contain more than one method with the same signatureWrite a program in Java to take an infix mathematical expression. The expression will contain single- or double-digit numbers, ‘+’, ‘-‘, ‘*’, and ‘/’ operators, and parenthesis. First check the validity of the expression with respect to the position of opening and closing parenthesis. If the expression is not valid then display appropriate message, otherwise, convert that infix expression to corresponding postfix expression, evaluate that postfix expression and print the final result. You can use relevant Java built-in classes in your code. The sample inputs/ outputs are given below: Sample inputs and outputs: (User’s inputs are shown in bold) Sample 1 Enter the mathematical expression: 15*(8–3*2)+16/4) The expression is invalid Sample 2 Enter the mathematical expression: 15*(8–3*2)+16/4 The postfix expression: 15 8 3 2 * - * 16 4 / + The final result: 34 Sometimes your deliver code is not showing. Please look up this issuesWrite a program in Java to take an infix mathematical expression. The expression will contain single- or double-digit numbers, ‘+’, ‘-‘, ‘*’, and ‘/’ operators, and parenthesis. First check the validity of the expression with respect to the position of opening and closing parenthesis. If the expression is not valid then display appropriate message, otherwise, convert that infix expression to corresponding postfix expression, evaluate that postfix expression and print the final result. You can use relevant Java built-in classes in your code. The sample inputs/ outputs are given below: Sample inputs and outputs: (User’s inputs are shown in bold) Sample 1 Enter the mathematical expression: 15*(8–3*2)+16/4) The expression is invalid Sample 2 Enter the mathematical expression: 15*(8–3*2)+16/4 The postfix expression: 15 8 3 2 * - * 16 4 / + The final result: 34
- Use Java ⮚ Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. ⮚ Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000.⮚ For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II. ⮚ Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used: I can be placed before V (5) and X (10) to make 4 and 9. X can be placed before L (50) and C (100) to make 40 and 90. C can be placed before D (500) and M (1000) to make 400 and 900. ⮚ Given a roman numeral, convert it to an integerThis is a Java program and the name must be separated with indexOf and substrings. Can not be split ..Prompt the user to enter any full name (first middle surname). Do not bother with surnames like O'Reilly, Van Helsing, de Ville etc. Then output the following in this order with a message and the data on seperate lines: the length of the full name, including spaces. the length of the middle name. the three initials of the name. the name in all upper case. ***Note: Read in the full name in a single prompt into a single variable (required), then process into first/middle/last in the program. Example Output Enter a first name middle name and surname Peggy Sue Palmer (this is entered by the user as an example, it is not output) Length of your name: 16 characters Length of your middle name: 3 characters Your initials are PSP PEGGY SUE PALMER ?Show the user a list of the names (with integers before each name). Allow the user to select which friend is his/her best friend. Write in java and use test case examples as a result.