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Issue 302 fixed added comments to code in 6.4 #311

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Issue 302 fixed added comments to code in 6.4 #311

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20 changes: 10 additions & 10 deletions source/ch6_definingclasses.ptx
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Original file line number Diff line number Diff line change
Expand Up @@ -559,7 +559,7 @@ Fraction@6ff3c5b5
<program xml:id="java-tostring" language="java">
<code>
public String toString() {
return numerator.toString() + "/" + denominator.toString();
return numerator.toString() + "/" + denominator.toString(); // convert to a string
}
</code>
</program>
Expand Down Expand Up @@ -598,10 +598,10 @@ object1.equals(object2)

<program xml:id="java-fraction-equals" language="java">
<code>
public boolean equals(Fraction other) {
Integer num1 = this.numerator * other.getDenominator();
Integer num2 = this.denominator * other.getNumerator();
if (num1 == num2)

public boolean equals(Fraction other) { // a method to compare two fractions
Integer num1 = this.numerator * other.getDenominator(); Integer num2 = this.denominator * other.getNumerator();
if (num1 == num2) // if the numerators are equal in value, the fractions are equal
return true;
else
return false;
Expand Down Expand Up @@ -688,16 +688,16 @@ public class Fraction extends Number {

<program xml:id="java-object-type-conversions" language="java">
<code>
public double doubleValue() {
public double doubleValue() { // convert to a double
return numerator.doubleValue() / denominator.doubleValue();
}
public float floatValue() {
public float floatValue() { // convert to a float
return numerator.floatValue() / denominator.floatValue();
}
public int intValue() {
public int intValue() { // convert to an int
return numerator.intValue() / denominator.intValue();
}
public long longValue() {
public long longValue() { // convert to a long
return numerator.longValue() / denominator.longValue();
}
</code>
Expand All @@ -724,7 +724,7 @@ public long longValue() {
<program xml:id="java-ugly-add-method" language="java">
<code>
public void test(Number a, Number b) {
a.add(b);
a.add(b); // this is a bad idea
}
</code>
</program>
Expand Down