Question

Once your UML diagram is complete implement the class naming the Java file MyInteger.java. Create another Java file, a program named MyIntegerTester.java that tests all methods in the class. One technique is to write both classes at the same time. As much as possible you implement and test one method at a time. This minimized the amount of new code you have to look at when debugging a method. Only the Version 4.0 “tester” file will have main() method in it. Here is a sample run of what the output of MyIntegerTester might look like. Tests use MyInteger n1 object constructed with MyIneger(5) Testing equals(int), n1 and 6: false Testing equals(MyInteger), n1 and n2 = 7: false Testing isEven(), n1 which is 5, is even? false Testing isOdd(), n1 which is 5, is odd? true Testing static isPrime(), n1 which is 5, is prime? true Testing instance isPrime(), 5 is prime? true Next two tests use char[] and Sring data of 3539 Testing parseInt(char[]): 3539 Testing parseInt(String)Passing: 3539

Answer 1

class MyInteger {
   private int value;

   public MyInteger(int aValue) {
       super();
       value = aValue;
   }

   public boolean isEven() {
       return value % 2 == 0;
   }

   public boolean isOdd() {
       return value % 2 == 1;
   }

   public boolean isPrime() {
       if (value == 2)
           return true;
       if (value % 2 == 0)
           return false;
       for (int i = 2; i < value; i++)
           if (value % i == 0)
               return false;
       return true;
   }

   public boolean isEven(int value) {
       return value % 2 == 0;
   }

   public boolean isOdd(int value) {
       return value % 2 == 1;
   }

   public boolean isPrime(int value) {
       if (value == 2)
           return true;
       if (value % 2 == 0)
           return false;
       for (int i = 2; i < value; i++)
           if (value % i == 0)
               return false;
       return true;
   }

   public boolean isEven(MyInteger value) {
       return value.isEven();
   }

   public boolean isOdd(MyInteger value) {
       return value.isOdd();
   }

   public boolean isPrime(MyInteger value) {
       return value.isPrime();
   }

   @Override
   public int hashCode() {
       final int prime = 31;
       int result = 1;
       result = prime * result + value;
       return result;
   }

   @Override
   public boolean equals(Object obj) {
       if (this == obj)
           return true;
       if (obj == null)
           return false;
       if (getClass() != obj.getClass())
           return false;
       MyInteger other = (MyInteger) obj;
       if (value != other.value)
           return false;
       return true;
   }

   public int parseInt(String s) {
       return Integer.parseInt(s);
   }

   public int parseInt(char s[]) {
       return Integer.parseInt(new String(s));
   }
}

public class MyIntegerTester {
   public static void main(String[] args) {
       MyInteger n1 = new MyInteger(5);
       System.out.println(n1.equals(6));
       MyInteger n2 = new MyInteger(7);
       System.out.println(n1.equals(n2));
       System.out.println(n1.isEven());
       System.out.println(n1.isOdd());
       System.out.println(n1.isPrime());
       System.out.println(n1.parseInt("3539"));
       System.out.println(n1.parseInt("3539".toCharArray()));
      
   }
}

<terminated > MyIntegerte false false false true true 3539 3539

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