29 lines
761 B
Java
29 lines
761 B
Java
package strings;
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public class Upper {
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/** Driver Code */
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public static void main(String[] args) {
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String[] strings = {"ABC", "ABC123", "abcABC", "abc123ABC"};
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for (String s : strings) {
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assert toUpperCase(s).equals(s.toUpperCase());
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}
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}
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/**
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* Converts all of the characters in this {@code String} to upper case
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*
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* @param s the string to convert
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* @return the {@code String}, converted to uppercase.
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*/
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public static String toUpperCase(String s) {
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char[] values = s.toCharArray();
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for (int i = 0; i < values.length; ++i) {
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if (Character.isLetter(values[i]) && Character.isLowerCase(values[i])) {
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values[i] = Character.toUpperCase(values[i]);
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}
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}
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return new String(values);
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}
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}
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