Strings
Strings are variables used in Java for storing text. They are immutable which means they cannot be changed.
There are two different ways to create strings:
String literal
String s1= "John";
Using the new keyword
String s2 = new String("Tim");
Commonly Used String Methods
indexOf()- returns the position of the first occurrence of a specified string as an integer.
System.out.println(s1.indexOf("o"));
1
length()-returns the length of the string as an integer.
System.out.println(s2.length());
3
substring()-returns characters from a string from a specified beginning to a specified end point.
System.out.println(s1.substring(1,3));
oh
toLowerCase()/toUpperCase()- converts the string to uppercase or lowercase.
System.out.println(s1.toUpperCase());
JOHN
References
https://www.geeksforgeeks.org/strings-in-java/
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