Java String toUpperCase() Method Tutorial

In this section, we will learn what the String toUpperCase() method is and how to use it in Java.

What is Java String toUpperCase() Method?

The `toUpperCase()` method is used to turn all the letters of a string value into uppercase and return a new String object as a result.

Note: this method does not change the original string value but returns a new one as a result.

Java toUpperCase() Method Syntax:

public String toUpperCase()

toUpperCase() Method Parameters:

This method does not take an argument.

toUpperCase() Method Return Value:

The return value of this method is a new string value with the same content as the target string value but converted in uppercase letters.

toUpperCase() Method Exceptions:

This method does not throw an exception.

Example: using String toUpperCase() method

public class Simple {

    public static void main(String[] args)  {
        String s1 = "be kind to one another";
        String res = s1.toUpperCase();
        System.out.println(res);
    }
}

Output:

BE KIND TO ONE ANOTHER

Convert Uppercase to Lowercase

On the contrary, to the `toUpperCase()` method we have `toLowerCase()` method.

This method is used to convert an uppercase string value into lowercase.

Example: converting uppercase string value to lowercase

public class Simple {

    public static void main(String[] args)  {
        String s1 = "BE KIND TO ONE ANOTHER";
        String res = s1.toLowerCase();
        System.out.println(res);
    }
}

Output:

be kind to one another

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