implement MixedNumber class
FRACTION.JAVA
package PJ1;
public class Fraction implements FractionInterface,Comparable<Fraction> {
private int num;
private int den;
public Fraction() {
setFraction(0, 1);
}
public Fraction(int num, int den) {
setFraction(num, den);
}
public void setFraction(int num, int den) {
this.num = num;
if (den == 0)
throw newProject1Exception(“Denominator is 0”);
this.den = den;
adjustSigns();
reduceFractionToLowestTerms();
}
public char getSign() {
char sign;
if (num >= 0)
sign =’+’;
else
sign =’-‘;
return sign;
}
public void setSign(char sign) {
num = Math.abs(num);
den =
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