47 lines
1.2 KiB
Java
47 lines
1.2 KiB
Java
package session1;
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public class StringCalculator {
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public int add(String numbers) throws CalculateException {
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// Did we get some input? Good! Lets calculate!
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if (numbers != "") {
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// Look for negative numbers
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if (numbers.contains("-")) {
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throw new CalculateException("Negatives not allowed");
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}
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// Do we need another delimiter?
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if (numbers.contains("//")) {
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numbers = numbers.replace("\n", "");
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String delimiter = String.valueOf(numbers.charAt(2));
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String[] split = numbers.split(delimiter);
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return Integer.parseInt(split[1]) + Integer.parseInt(split[2]);
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}
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// Replace all those \n with the standard delimiter
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numbers = numbers.replace("\n", ",");
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// Two delimiters? We can't have that
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if (numbers.contains(",,")) {
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throw new CalculateException("Two separators found.");
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}
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// A standard delimiter? Go ahead and calculate
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if (numbers.contains(",")) {
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String[] split = numbers.split(",");
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return Integer.parseInt(split[0]) + Integer.parseInt(split[1]);
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}
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// No delimiters? OK, you can have your number back them
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else {
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return Integer.parseInt(numbers);
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}
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}
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// No input? Then I got nothing to do.
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else {
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return 0;
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}
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}
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}
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