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Upper.java

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package com.string;

public class Upper {

/**

* Converts all of the characters in this {@code String} to upper case

*

* @param s the string to convert

* @return the {@code String}, converted to uppercase.

*/

public static String toUpperCase(String s) {

char[] values = s.toCharArray();

for (int i = 0; i < values.length; ++i) {

if (Character.isLetter(values[i]) && Character.isLowerCase(values[i])) {

values[i] = Character.toUpperCase(values[i]);

}

}

return new String(values);

}

}