java - Comparable interface project -

i'm stuck on project, far have got:

public class myint implements comparable<myint> {     private int value;      myint(int x) {         value = x;     }      public string tostring() {         return ("" + value);     }      public int intvalue() {         return value;     }      public int compareto(myint rhs) {         myint myint = (myint) rhs;         int myinteger = myint.intvalue();         int result = 0;         if (value < myinteger) {             result = -1;         } else if (value == myinteger) {             result = 0;         } else {             result = +1;         }         return result;      } } 

and question: consider following java library interface:

public interface comparable<t> { int compareto(t rhs); } 

complete implementation of class below implements above interface (note interface automatically imported java – not re-type in project). compareto method should return -1 if value less rhs.value, 0 if both sides equal , +1 if value greater rhs.value.

public class myint implements comparable<myint> { private int value; myint(int x) {...} public string tostring() {...} public int intvalue() {...} public int compareto(myint rhs){...} }  

now need implement comparable interface in class performs basic arithmetic rational numbers, best use inheritance achieve this?the class :

public class rational {     private int num;     private int denom;      public rational() {         this(0,1);     }      public rational(int num, int denom) {         this.num = num;         this.denom = denom;     }      int getnum() {         return num;     }      int getdenom() {         return denom;     }      public rational add(rational rhs) {         return new rational(num * rhs.denom + rhs.num * denom, denom * rhs.denom);     }      public rational subtract(rational rhs) {         return new rational(num * rhs.denom - rhs.num * denom, denom * rhs.denom);     }      public rational multiply(rational rhs) {         return new rational(num * rhs.num, denom * rhs.denom);     } public rational divide(rational rhs) {     return new rational(num * rhs.denom, denom * rhs.num); }  public string tostring() {     string result;      if (num == 0)         result = "0";     else if (denom == 1)         result = num + "";     else         result = num + "/" + denom;      return result; }  public static void main(string[] args) {     rational r1 = new rational(1, 2); // 1/2     rational r2 = new rational(3, 4);// 3/4     rational result = new rational();     result = r1.add(r2);     system.out.println(result);      rational result1 = new rational();     result1 = r1.subtract(r2);     system.out.println(result1);      rational result2 = new rational();     result2 = r1.multiply(r2);     system.out.println(result2);      rational result3 = new rational();     result3 = r1.divide(r2);     system.out.println(result3);  } 

}

you need compare this.intvalue() (the current instance) , rhs.intvalue() (the "right hand side"). comparing rhs (by aliasing myint) should return 0. , storing result temporary variable doesn't seem server purpose in code. like

// myint myint = (myint) rhs; if (this.intvalue() < rhs.intvalue()) {     return -1; } else if (this.intvalue() == rhs.intvalue()) {     return 0; } return 1;