In this kotlin example tutorial we will learn how to check given string is lower case or upper case and how do i convert string to lower case and upper case.
To check the given string contains lower case or upper case letter we will use below two methods
-
isLowerCase()
-
isUpperCase()
Now let's check the Given Sting contains lower or upper case
- Take Sting
- Let's iterate String for each character
- Then use the methods isLowerCase(), isUpperCase() methods
Based on the return values we can say it contains lower or upper case characters
fun main()
{
val caseString = "This is String Case examples "
for (c in caseString)
{
if (c.isLowerCase())
{
print("Contains Lower case")
break;
}
if (c.isUpperCase())
{
print("Contains Upper case")
break;
}
}
}
|
How do we convert convert string to upper case?
To convert given string to upper case we will use toUpperCase() method.
fun main()
{
var caseString = "This is String Case examples "
caseString=caseString.toUpperCase();
print(caseString)
}
|
Convert String to Lower case
To convert given string to upper case we will use toLowerCase() method.
fun main()
{
var caseString = "This is String Case examples "
caseString=caseString.toLowerCase();
print(caseString)
}
|
Output:
this is string case examples
|
Conclusion: In this kotlin example we learned how to check String contains lower case/upper case letters and how to convert given string to lower/upper case.