Question

I have a Java class called Term holding polynomials like below

public Term(int c, int e) throws NegativeExponent {
    if (e < 0) throw new NegativeExponent();
    coef = c;
    expo = (coef == 0) ? 1 : e;
}

I also have an equals method in the same class like below

@Override
public boolean equals(Object obj) {

}

I am stuck with how to code how to compare these 2 Term objects

Within my JUnit test file I am using the test below to try and test the equals method

import static org.junit.Assert.*;

import org.junit.Test;

public class ConEqTest
{
    private int min = Integer.MIN_VALUE;
    private int max = Integer.MAX_VALUE;



@Test
public void eq01() throws TError { assertTrue(new Term(-10,0).equals(new Term(-10,0))); }

@Test
public void eq02() throws TError { assertTrue(new Term(0,0).equals(new Term(0,2))); }

Answer 1

What’s wrong with

@Override
public boolean equals(Object obj) {
    if (! (obj instanceof Term))
        return false;
    Term t = (Term)obj;
    return coef == t.coef && expo == t.expo; 
}