String functions with output- length, charAt, compareTo, equals, concat, indexOf, substring

class strings
{
    void str()
    {
        String name1="Aman";
        String name2="Tania";
        String name3="Aman";
        String name4="aman";
       
       
        System.out.println("length of "+ name1 + " is = " + name1.length());
        System.out.println("length of "+ name2 + " is = " + name2.length());
       
        System.out.println("character at 3 in "+ name1 + " is = " + name1.charAt(3));
       System.out.println("character at 4 in "+ name2 + " is = " + name2.charAt(4));
      
      
       System.out.println("comparison of the 2 names is  " + name1.compareTo(name2));
       System.out.println("comparison of the 2 names is  " + name2.compareTo(name1));
       System.out.println("comparison of the 2 names is  " + name3.compareTo(name1));
       System.out.println("comparison of the 2 names is  " + name4.compareTo(name1));
      
       System.out.println("equality comparison of the 2 names is  " + name2.equals(name1));
       System.out.println("equality comparison of the 2 names is  " + name3.equals(name1));
      
       System.out.println("concatenation of the 2 names is  " + name1.concat(name2));
       System.out.println("concatenation of the 2 names is  " + name1+name2);
      
       System.out.println("First occurence of 'a' in " + name2 + "is at index " + name2.indexOf('a'));
      
       System.out.println("Last occurence of 'a' in " + name2 + " is at index " + name2.lastIndexOf('a'));
       System.out.println("First occurence of 'x' in " + name2 + " is at index " + name2.indexOf('x'));
       System.out.println("Substring 1 onwards  in " + name2 + " is = " + name2.substring(1));
      
      
      
    }
}


Output:
length of Aman is = 4
length of Tania is = 5
character at 3 in Aman is = n
character at 4 in Tania is = a
comparison of the 2 names is  -19
comparison of the 2 names is  19
comparison of the 2 names is  0
comparison of the 2 names is  32
equality comparison of the 2 names is  false
equality comparison of the 2 names is  true
concatenation of the 2 names is  AmanTania
concatenation of the 2 names is  AmanTania
First occurence of 'a' in Taniais at index 1
Last occurence of 'a' in Tania is at index 4
First occurence of 'x' in Tania is at index -1
Substring 1 onwards  in Tania is = ania



Note:
if
System.out.println("character at 5 in "+ name1 + " is = " + name1.charAt(5));
is also added to the above program, it ll throw an error:

java.lang.StringIndexOutOfBoundsException: String index out of range: 5
    at java.lang.String.charAt(String.java:686)
    at strings.str(strings.java:16)

This is so because charAt(5) points to 5th character which is beyond the length of the string = 4