convert to upper case in java code example

Example 1: java uppercase

"Hello World".toUpperCase()

Example 2: string to uppercase

const upperCase = function(names){
    const toLower = names.toLowerCase().split(' ');
    const namesUpper = [];
    for(const wordName of toLower){
        namesUpper.push(wordName[0].toUpperCase() + wordName.slice(1));
    }
    return namesUpper.join(' ');
}

Example 3: upper en java

public class Guru99 {   
    public static void main(String args[]) {       
        String S1 = new String("minúsculas convertidas en mayúsculas");       
 
        // Convertir a UpperCase    
        System.out.println(S1.toUpperCase());   
    }
}