[java] 英字の文字列を大文字、小文字に変換

●英字の文字列を大文字、小文字に変換
toUpperCase()
toLowerCase()

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public class toUpperCaseDemo {
    public static void main(String args[]){
        String s1 = "the total cost is \\500";
        String s2 = s1.toUpperCase();
        //
        System.out.println(s1.toUpperCase());
        System.out.println(s2.toLowerCase());
    }
}
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