String Manipulation in Java
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Questions and Answers

What is the result of the comparison text1.compareToIgnoreCase(text2) given the values of text1 and text2?

  • 14
  • 0
  • 7 (correct)
  • -7

    • What is the expected output of text1.compareToIgnoreCase(text3)?

  • 14
  • 0 (correct)
  • 7
  • -7

    • What will happen when trying to execute System.out.println(output1,output2,output3,output4);?

  • It will generate a runtime error.
  • It will print all output values correctly.
  • It will cause a compilation error. (correct)
  • It will print only the first output value.

    • Which function is correctly defined to remove whitespace from both ends of a string?

    <p>String trim() (D)</p> Signup and view all the answers

    What will text1.compareToIgnoreCase(text4) return when the values of text1 and text4 are compared?

    <p>7 (D)</p> Signup and view all the answers

    What is the output of the code snippet that calculates the length of the string 'DATA STRUCTURE WITH JAVA'?

    <p>24 (B)</p> Signup and view all the answers

    Which of the following correctly displays a combination of two strings from the provided strings?

    <p>Welcome Joy with Java (A)</p> Signup and view all the answers

    Which of the following strings is not a valid example from the provided options?

    <p>Floating Point Example (B)</p> Signup and view all the answers

    How many distinct strings are presented in option c?

    <p>6 (B)</p> Signup and view all the answers

    Which concept is illustrated by the function string.length() in the provided code?

    <p>Returning the number of characters in a string. (A)</p> Signup and view all the answers

    What does the program in 'createStringDemo' print when executed?

    <p>aeiou 5# (D)</p> Signup and view all the answers

    What is the purpose of the 'trim()' method in the 'TrimStringDemo' class?

    <p>It removes whitespace from both ends of the string. (B)</p> Signup and view all the answers

    What will be the output of 'text.toUpperCase()' in 'TrimStringDemo'?

    <p>DATA STRUCTURE WITH JAVA (A)</p> Signup and view all the answers

    What will the 'replace(

    <p>It has no effect on the 'text' string. (D)</p> Signup and view all the answers

    Which statement is NOT accurate regarding the provided Java program?

    <p>Switching to System.out.println() would lead to a NullPointerException. (B), The string variable can be modified after its creation. (D)</p> Signup and view all the answers

    What will 'text.charAt(5)' return in the context of 'TrimStringDemo'?

    <p>' ' (a space) (B)</p> Signup and view all the answers

    Which of the following statements is true regarding the output of 'TrimStringDemo'?

    <p>Multiple transformations of the string are displayed. (B)</p> Signup and view all the answers

    What is the difference in behavior between System.out.print() and System.out.println()?

    <p>System.out.println() outputs the string with a newline at the end. (D)</p> Signup and view all the answers

    What would happen if the 'trim()' method was not called on 'text' in 'TrimStringDemo'?

    <p>The output would include leading and trailing spaces. (B)</p> Signup and view all the answers

    Which aspect of strings in Java is true?

    <p>Strings in Java are immutable. (A)</p> Signup and view all the answers

    If a user modified 'createStringDemo' to include a new character in the array, how would that affect the output?

    <p>The output will remain unchanged. (B)</p> Signup and view all the answers

    If the code 'System.out.println(text)' is used instead of 'System.out.print(text)', what will happen?

    <p>It will still print the same string but with a newline at the end. (B)</p> Signup and view all the answers

    Which of the following statements about System.out.print() is true?

    <p>It prints strings as they are without adding a newline. (D)</p> Signup and view all the answers

    In Java, what will happen when trying to change the contents of an existing string variable?

    <p>A new string object is created instead. (A)</p> Signup and view all the answers

    What is the primary feature of the string 'text' when the Java program runs?

    <p>It is displayed without any modifications. (A)</p> Signup and view all the answers

    When modifying the behavior of the print method, what misconception is commonly held?

    <p>System.out.print() and System.out.println() function identically. (A), print() methods throw exceptions when printing empty strings. (B), Only println() accepts null arguments. (C)</p> Signup and view all the answers

    What is the output of the expression strOb1 + " and " + strOb2?

    <p>First String and Second String (C)</p> Signup and view all the answers

    Which of the following correctly describes the output of the fourth System.out.println?

    <p>Data Structure with Java (A)</p> Signup and view all the answers

    What is the purpose of the insert method in StringBuffer?

    <p>To add a substring at a specified index (C)</p> Signup and view all the answers

    After executing text.delete(14,19);, what will be the state of the StringBuffer text?

    <p>Data Structure C++ (D)</p> Signup and view all the answers

    What will be the result of executing text.reverse(); on the current state of text?

    <p>avaJtureC (C)</p> Signup and view all the answers

    What does the append method do in regards to StringBuffer?

    <p>It concatenates a string to the end of the existing string (C)</p> Signup and view all the answers

    What will happen if the code attempts to use strOb2.replace(0, 6, "New String"); without any declaration of strOb2 as a StringBuffer?

    <p>Compilation error due to type mismatch. (D)</p> Signup and view all the answers

    What is the effect of the replace method when applied to text?

    <p>It replaces characters between two specified indices. (D)</p> Signup and view all the answers

    Study Notes

    String Manipulation in Java

    • System.out.println(aSet); will print the characters in the array aSet on a single line, separated by spaces.
    • trim() method removes leading and trailing spaces in a String.
    • toUpperCase() method converts all characters in a String to uppercase.
    • replace(char old, char new) method replaces all occurrences of a character with another character in a String.
    • Strings in Java are immutable, meaning any operation on a String creates a new String object.
    • The compareToIgnoreCase() method compares two Strings lexicographically, ignoring case.
    • StringBuffer is a mutable class, allowing modification of the String it holds.
    • append() method adds a String to the end of a StringBuffer.
    • insert() method inserts a string at a specified index in a StringBuffer.
    • replace() method replaces a substring within a StringBuffer.
    • delete() method removes a substring within a StringBuffer.
    • reverse() method reverses the contents of the StringBuffer.
    • The length() method returns the number of characters in a String.

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    Description

    This quiz covers key concepts of string manipulation in Java, including methods like trim(), toUpperCase(), and the functionality of StringBuffer. Test your knowledge of string immutability and mutable classes, as well as various methods for string operations. Perfect for students looking to enhance their Java programming skills.

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