String In Java - Tutorials For WebDriver

We have learnt about DIFFERENT DATA TYPES IN JAVA In my past post. Now, Many peoples are understanding that Java String Is also a data type. Let me correct them -> String Is not data type in java software development language. If string Is not data types then what Is String? This question can be asked by Interviewer too. Strings are objects prepared by sequence of characters. The java.lang has String class to create and manipulate strings. String class has many Inbuilt functions which we can use to perform different actions on string.

If you don't know, Let me tell you that we have to work with strings very frequently In selenium WebDriver tests for software application. So you must have knowledge of useful functions of String class to use them In your selenium webdriver software test case development. Let us take simple example of String to understand different methods of String class in java software development language.

public class Strng_Example {

 public static void main(String[] args) {
  
  String st1 = "This World is Very Nice";
  String st2 = " And Beautiful.";
  
  //Comparing two strings. Return true If both match else return false.
  System.out.println("st1 equals to st2? -> "+st1.equals(st2));
  
  //Concatenates st2 with st1.
  System.out.println("Concatenation of st1 and st2 Is -> "+st1.concat(st2));
  
  //Retrieve the 9th Indexed character from string.
  System.out.println("Character at Index 9 Is -> "+st1.charAt(9));
  
  //Find the length of string.
  System.out.println("Length Of St1 -> "+st1.length());
  
  //Converting whole string In lower case.
  System.out.println("String In Lowercase -> "+st1.toLowerCase());
  
  //Converting whole string In upper case.
  System.out.println("String In uppercase -> "+st1.toUpperCase());
  
  //Retrieve the Index of first 'i' character.
  System.out.println("Index of 1st charater i Is -> "+st1.indexOf('i'));
  
  //Retrieve the index of 2nd most 'i' character.
  System.out.println("Index of 2nd charater i Is -> "+st1.indexOf('i', 3));
  
  //Retrieve the Index of word 'Very' from string.
  System.out.println("Index of word Very Is -> "+st1.indexOf("Very"));
  
  //Converting value From int to string.
  int j = 75;
  String val2 = String.valueOf(j);
  System.out.println("Value Of string val2 Is -> "+val2);
  
  //Converting string to integer.
  String val1="50";
  int i = Integer.parseInt(val1);
  System.out.println("Value Of int i Is -> "+i);
  
  //Print the String starting from 5th Index to 12th Index.
  System.out.println("Retrieving sub string from string -> "+st1.substring(5, 13));
  
  //Split string. 
  String splt[] = st1.split("Very");
  System.out.println("String Part 1 Is -> "+splt[0]);
  System.out.println("String Part 2 Is -> "+splt[1]); 

                //Trim String.
  System.out.println("Trimmed st2 -> "+st2.trim()); 
 }
}

If you will look at above example, I have prepared different examples of string method to take some action or we can say operations on string. Sort explanation of all above string methods are as bellow.

Two String Comparison

To compare two strings, we can use syntax like st1.equals(st2). It will return True If both strings are same else It will return False.

Two String Concatenation

Syntax st1.concat(st2) will concatenate st1 with st2.

Retrieving Character from Index

Syntax st1.charAt(9)) will retrieve the character from string st1 located at 9th Index. Index Starts from 0.

Length Of String

st1.length() will return lenght of string st1.

Convert String In Lower Case Letters

st1.toLowerCase() will convert whole string letters In lower case.

Convert String In UpperCase Letters

st1.toUpperCase() will convert whole string letters In upper case.

Retrieving Index Of 1st most character

st1.indexOf('i') will retrieve Index of first most character 'i' from string.

Retrieving Index Of 2nd most character

st1.indexOf('i', 3)) will retrieve Index of second most character 'i' from string. 3 described the from Index means It will start finding character 'i' from Index 3. First 'i' has Index 2 so we need to use 3 to find 2nd most character.

Retrieving Index Of specific word from string

st1.indexOf("Very") will retrieve index of word 'Very' from string.

Convert from Integer To String

String.valueOf(j) will convert value of 'j' from int to string.

Convert from String To Integer

Integer.parseInt(val1) will conver value of 'val1' from string to int.

Retrieving sub string from string

Syntax st1.substring(5, 13) will retrieve string from Index 5 To Index 13.

Split String

String splt[] = st1.split("Very") will split string st1 from word 'Very' and store both strings In array.

Trim String

If string has white space at beginning or end of the string then you can use trim function like st2.trim() to remove that white space.

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