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ola malte, gostaria de saber se alguém me pode explicar como se usa o toUpperCase(). é que eu tenho esta linha de código str=str.substring(0,i+1)+str.toUpperCase(str.charAt(i+1))+str.substring(i+1,str.length()); e dá erro. mesmo quando tento fazer só str.toUpperCase('c'); continua a dar erro...


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Basta ir ler a documentação do Java para perceber o porquê do erro:

public String toUpperCase()

Converts all of the characters in this String to upper case using the rules of the default locale.

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