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Questions and Exercises: Characters and Strings (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)
Trail: Learning the Java Language
Lesson: Numbers and Strings
Home Page > Learning the Java Language > Numbers and Strings
Questions and Exercises: Characters and Strings

Questions

  1. What is the initial capacity of the following string builder?
    StringBuilder sb = new StringBuilder("Able was I ere I saw Elba.");
    

  2. Consider the following string:
    String hannah = "Did Hannah see bees? Hannah did.";
    
    1. What is the value displayed by the expression hannah.length()?
    2. What is the value returned by the method call hannah.charAt(12)?
    3. Write an expression that refers to the letter b in the string referred to by hannah.

  3. How long is the string returned by the following expression? What is the string?
    "Was it a car or a cat I saw?".substring(9, 12)
    

  4. In the following program, called ComputeResult, what is the value of result after each numbered line executes?
    public class ComputeResult {
        public static void main(String[] args) {
            String original = "software";
            StringBuilder result = new StringBuilder("hi");
            int index = original.indexOf('a');
    
    /*1*/   result.setCharAt(0, original.charAt(0));
    /*2*/   result.setCharAt(1, original.charAt(original.length()-1));
    /*3*/   result.insert(1, original.charAt(4));
    /*4*/   result.append(original.substring(1,4));
    /*5*/   result.insert(3, (original.substring(index, index+2) + " ")); 
    
            System.out.println(result);
        }
    }
    

Exercises

  1. Show two ways to concatenate the following two strings together to get the string "Hi, mom.":
    String hi = "Hi, ";
    String mom = "mom.";
    
  2. Write a program that computes your initials from your full name and displays them.
  3. An anagram is a word or a phrase made by transposing the letters of another word or phrase; for example, "parliament" is an anagram of "partial men," and "software" is an anagram of "swear oft." Write a program that figures out whether one string is an anagram of another string. The program should ignore white space and punctuation.
Check your answers.
Previous page: Summary of Characters and Strings
Next page: Generics

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java, Tomcat, MySQL, Apache and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


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