Answer Happy

StringMethod.java
/**
* Compares string1 and string2 and returns a
comma-delimited concatenated
* string consisting of the string that is first
lexically followed by the
* string that is second lexically. If the
strings are equal, then only string1
* is returned.
*
* @param string1 String to compare against
string2.
* @param string2 String to compare against
string1.
* @return A concatenation of string1 and
string2 in order.
*/
public static String pairs(String string1, String
string2) {
String line = null;
// enter code here
return line;
}
/**
* Finds the distance between the s1 and s2. The
distance between two strings of
* the same length is the number of positions in
the strings at which their
* characters are different. If two strings are
not the same length, the
* distance is unknown (-1). If the distance is
zero, then two strings are
* equal.
*
* @param string1 String to compare against
string2.
* @param string2 String to compare against
string1.
* @return The distance between string1 and
string2.
*/
public static int stringDistance(String string1,
String string2) {
int distance = 0;
// enter code here
return distance;
}
}
Main.java
public class Main {
// Constants
private static final String LINE =
"-".repeat(40);
private static final String TEST_LINE =
"=".repeat(80);
/**
* @param args Unused.
*/
public static void main(String[] args) {
System.out.println("Strings Lab Methods
Tests");
System.out.println();
System.out.println("Tests are of the
form:");
System.out.println(" Test Operation\n
{expected value}: actual value");
System.out.println();
testPairs();
testStringDistance();
System.out.println(TEST_LINE);
System.out.println("Done");
}
private static void testPairs() {
System.out.println(TEST_LINE);
System.out.println("Testing pairs");
System.out.println(LINE);
String s1 = "a";
String s2 = "b";
String expected = "a,b";
String actual = StringMethods.pairs(s1,
s2);
System.out.println("pairs(\"" + s1 + "\", \"" +
s2 + "\")\n {" + expected + "}: " + actual);
s1 = "b";
s2 = "a";
expected = "a,b";
actual = StringMethods.pairs(s1, s2);
System.out.println("pairs(\"" + s1 + "\", \"" +
s2 + "\")\n {" + expected + "}: " + actual);
s1 = "line";
s2 = "line";
expected = "line";
actual = StringMethods.pairs(s1, s2);
System.out.println("pairs(\"" + s1 + "\", \"" +
s2 + "\")\n {" + expected + "}: " + actual);
System.out.println();
}
private static void testStringDistance() {
System.out.println(TEST_LINE);
System.out.println("Testing
stringDistance");
System.out.println(LINE);
String s1 = "a";
String s2 = "a";
int expected = 0;
int actual = StringMethods.stringDistance(s1,
s2);
System.out.println("stringDistance(\"" + s1 +
"\", \"" + s2 + "\")\n {" + expected + "}: " + actual);
s1 = "a";
s2 = "b";
expected = 1;
actual = StringMethods.stringDistance(s1,
s2);
System.out.println("stringDistance(\"" + s1 +
"\", \"" + s2 + "\")\n {" + expected + "}: " + actual);
s1 = "North";
s2 = "South";
expected = 2;
actual = StringMethods.stringDistance(s1,
s2);
System.out.println("stringDistance(\"" + s1 +
"\", \"" + s2 + "\")\n {" + expected + "}: " + actual);
s1 = "short";
s2 = "longer";
expected = -1;
actual = StringMethods.stringDistance(s1,
s2);
System.out.println("stringDistance(\"" + s1 +
"\", \"" + s2 + "\")\n {" + expected + "}: " + actual);
}
}