Java String toUpperCase() methods

Java String toUpperCase() method is used to convert all the characters of the String into upper case.

Syntax

public String toUpperCase()
public String toUpperCase(Locale locale)

Returns

It returns upper case String.

Java String toUpperCase() Example 1:

public class JavaStringtoUpperCaseEx1 {
    public static void main(String args[]) {
        String S1 = new String("lowercase converted to uppercase ");
        //Convert to UpperCase
        System.out.println(S1.toUpperCase());
    }
}

Output:

LOWERCASE CONVERTED TO UPPERCASE

Java String toUpperCase() Example 2:

public class JavaStringtoUpperCaseEx2
    { 
        public static void main(String[] args)
        { 
            String str  = " tutorial and example ";
           System.out.println(str.toUpperCase());
            }
  }

Output:

TUTORIAL AND EXAMPLE

Java String toUpperCase() Example 3:

public class JavaStringtoUpperCaseEx3
    { 
        public static void main(String[] args)
        { 
            String str  = "tutorialandexample";
            String str2 = "TUTORIALANDEXAMPLE";          
           System.out.println(str.toUpperCase().equals(str2));
            }
  }

output:

true

Java String toUpperCase(Locale locale) Method Example 4:

import java.util.Locale;
public class JavaStringtoUpperCaseEx4
{
    public static void main(String args[])
    {
        String s = "you love python, but i love java.";
        // Locales with the language "tr" for TURKISH
        //"en" for ENGLISH is created
        Locale TURKISH = Locale.forLanguageTag("tr");
        Locale ENGLISH = Locale.forLanguageTag("en");
        // converting string s to lowercase letter
        // using TURKISH and ENGLISH language
        String S1 = s.toUpperCase(TURKISH);
        String S2 = s.toUpperCase(ENGLISH);
        System.out.println("In turkish language: "+S1);
        System.out.println("In English language: "+S2);
    }
}

Output:

In turkish language: YOU LOVE PYTHON, BUT ? LOVE JAVA.
In English language: YOU LOVE PYTHON, BUT I LOVE JAVA.