STRING CLASS FUNCTIONS IN JAVA WITH EXAMPLES

String class: It is a predefined class in java which contains some predefined functions to perform different operations on string. We can call all those functions in our programs by creating a reference to the String class.

Predefined string functions in java useful for testing are as follows

Length (): finds the length of the string

Equals (): compares two strings, returns

 True if both are matching else returns

 False

subString(): selects a part of a string

indexOf():finds a word or a char in the

 string then returns index of the string ,

 if not find then returns -1

split(): splitting a string

public class strng {

         

          public static void main(String[] args) {

                   String s="a b c d";

                   String s1= "india is a beautiful   country";

                   String s2="INDIA IS A BEAUTIFUL    COUNTRY";

                   System.out.println(s1.equals(s2));

                  

                   System.out.println(s1.length());

      System.out.println(s2.length());

     

      System.out.println(s1.substring(0,15));

      System.out.println(s2.substring(0,31));

     

     

System.out.println(s1.toUpperCase());

System.out.println(s2.toLowerCase());

System.out.println(s1.replace( 'i', 'j'));

System.out.println(s2.replace('I','J'));

int i=s1.indexOf("india");

//System.out.println(i);

if (i!=-1)

{

          System.out.println("passed");

}

else

{

          System.out.println("failed");

}

String data []= s1.split("()");

for (int j=0;j<data.length;j++)

{

          System.out.println(data[j]);

}

String data1 []= s2.split("()");

for (int k=0;k<data1.length;k++)

{

          System.out.println(data1[k]);

}

}

}