Java String toLowerCase | Java String toUpperCase

toLowerCase()

Converts all of the characters in this String to lowercase.

Syntax:

public String toLowerCase()

toUpperCase():

Converts all of the characters in this String to upper case.

Syntax:

public String toUpperCase()

Example:

class TestString{
    String str = "Roy";
    
    public void upperCase(){
        //will convert all characters in upper case.
        System.out.println(str.toUpperCase());
    }
    
    public void lowerCase(){
        //will convert all characters in lower case.
        System.out.println(str.toLowerCase());
    }
}

public class CaseChangeExample {
    public static void main(String args[]){
        //creating TestString object
        TestString obj = new TestString();
        
        //method call
        obj.upperCase();
        obj.lowerCase();
    }
}

Output

ROY
roy