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Challenge10.java
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Challenge10.java
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package challenge10;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
/**
* The Class Challenge10. in a String replace each given character to other e.g.
* blank with %20? Write a Java program to replace a given character in a String
* to other provided character, for example if you are asked to replace each
* blank in a String with %20, similar to URL encoding done by the browser, so
* that Server can read all request parameters. For example if the input is
* "Java is Great" and asked to replace space with %20 then it should be
* "Java%20is%20Great".
*/
public class Challenge10 {
/**
* To number.
*
* @param input
* the input
* @return the int
*/
public static String replace(String input, char old, String n) {
if (input == null || input.isEmpty()) {
throw new IllegalArgumentException("No source string found");
}
while (input.indexOf(old) != -1) {
int pos = input.indexOf(old);
input = input.substring(0, pos) + n + input.substring(pos + 1);
}
return input;
}
/**
* Test.
*/
@Test
public void test() {
String s = Challenge10.replace("Hello How are you", ' ', "%20");
System.out.println(s);
assertTrue("Hello%20How%20are%20you".equals(s));
try {
Challenge10.replace(null, 'e', "mm");
assertTrue(false);
} catch (IllegalArgumentException e) {
assertTrue(true);
}
}
}