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Unit 3: Discussion - Part 2

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Question

Read the lecture for Chapter 3, and then answer the following:

Chapter 3 introduces us to the String class. It shows some of the methods one can apply to this type of variable (i.e. length(), toLowerCase(), substring(), indexOf(), etc). This class has many more, all described in the Java documentation. Review these methods and present an example of their usage, properly written in Java code. Explain the purpose of your code and show a screen capture of the program running.

Answer 1

/****************************************StringExample.java********************************/

import java.util.Arrays;

public class StringExample {

   public static void main(String[] args) {

       /*
       * Following method are very useful in the String
       */
       String example = "Hello, How are you?";

       // return the length of string
       System.out.println("String length is: " + example.length());
       // return the string in lower case
       System.out.println("String in lower case: " + example.toLowerCase());
       // return the string in upper case
       System.out.println("String in upper case: " + example.toUpperCase());
       // return the index of char in string
       System.out.println("String index of perticular character: " + example.indexOf('w'));
       // return the char present on index
       System.out.println("Char present on index: " + example.charAt(9));
       // return the substring
       System.out.println("Sub string :" + example.substring(0, 4));
       // split method
       System.out.println("String array splitted by perticular char" + Arrays.toString(example.split(",")));
       // return the char array
       System.out.println("Char array: " + Arrays.toString(example.toCharArray()));
       // return true or false if string matched
       System.out.println("String matched: " + example.equals("Hello"));
       // return true or false if string matched with ignoring upper case or lower case
       System.out.println("String mathed: " + example.equalsIgnoreCase("hello, how are you?"));
       // return true or false if string contains some part of string which is given
       System.out.println("String contains: " + example.contains("Hello"));
       // return true if string matches some part of string
       System.out.println("String match: " + example.matches("are"));
       // to concating the string
       System.out.println("String concated: " + example.concat(" I'm fine!"));

   }
}
/*********************************output************************************/

String length is: 19
String in lower case: hello, how are you?
String in upper case: HELLO, HOW ARE YOU?
String index of perticular character: 9
Char present on index: w
Sub string :Hell
String array splitted by perticular char[Hello, How are you?]
Char array: [H, e, l, l, o, ,, , H, o, w, , a, r, e, , y, o, u, ?]
String matched: false
String mathed: true
String contains: true
String match: false
String concated: Hello, How are you? I'm fine!

Please let me know if you have any doubt or modify the answer, Thanks :)