Contents
- ./Autobox.java
- ./Chicken.java
./Autobox.java 1/2
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/**
* This class demonstrates inefficiencies with unnecessary autoboxing
*
* @author Sara Sprenkle
*/
public class Autobox {
/**
* Called when user runs java Autobox
*/
public static void main(String[] args) {
// Find the inefficiency in the code below.
long startTime = System.currentTimeMillis();
Long sum = 0L;
for (long i = 0; i < Integer.MAX_VALUE; i++) {
sum += i;
}
System.out.println(sum);
long finishTime = System.currentTimeMillis();
System.out.println("Elapsed time: " + (finishTime - startTime));
}
}
./Chicken.java 2/2
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import java.util.Arrays;
/**
* A simple Java class that models a Chicken. The state of the chicken is its
* name, height and weight.
*
* @author CSCI209
*/
public class Chicken implements Comparable {
// ------------ INSTANCE VARIABLES -------------------
/** the chicken's name */
protected String name;
/** the height of the chicken in centimeters */
protected int height;
/** the weight of the chicken in pounds */
protected double weight;
/** true iff the chicken is a female */
protected boolean isFemale;
/** default name of a Chicken */
public static final String DEFAULT_NAME = "BUBBA";
/**
* Creates a fully-specified Chicken object
*
* @param name
* the name of the Chicken
* @param height
* the Chicken's height, in cm
* @param weight
* the Chicken's weight, in pounds
* @param isFemale
* if the Chicken is female (true/false)
*/
public Chicken(String name, int height, double weight, boolean isFemale) {
this.name = name;
this.height = height;
this.weight = weight;
this.isFemale = isFemale;
}
/**
* Assumes Chickens are females
*
* @param name
* the name of the Chicken
* @param height
* the Chicken's height, in cm
* @param weight
* the Chicken's weight, in pounds
*/
public Chicken(String name, int height, double weight) {
this(name, height, weight, true);
}
/**
* Default name is Bubba; Assumes Chickens are female
*
* @param height
* the Chicken's height, in cm
* @param weight
* the Chicken's weight, in pounds
*/
public Chicken(int height, double weight) {
this(DEFAULT_NAME, height, weight, true);
}
/**
* Format of the string representation: Chicken name: <name> weight:
* <weight> height: <height> [male/female]
*/
@Override
public String toString() {
StringBuffer rep = new StringBuffer("Chicken name: ");
rep.append(name);
rep.append("\nweight: ");
rep.append(weight);
rep.append("\nheight: ");
rep.append(height);
rep.append("\n");
rep.append(isFemale ? "female" : "male"); // Java ternary operator; also
// available in C
return rep.toString();
}
/**
* Determines if two Chickens are equivalent, based on their name, height,
* weight, and gender.
*/
public boolean equals(Object o) {
if (o == this) {
return true;
}
Chicken other = (Chicken) o;
if (!other.getName().equals(this.getName())) {
return false;
}
if (other.getHeight() != this.getHeight()) {
return false;
}
if (other.weight != this.weight) {
return false;
}
return this.isFemale == other.isFemale;
}
/*
* (non-Javadoc)
*
* @see java.lang.Comparable#compareTo(java.lang.Object)
*/
/**
* Compares the chickens by their height
*/
@Override
public int compareTo(Object o) {
if (!(o instanceof Chicken)) {
return 1;
}
Chicken otherChicken = (Chicken) o;
if (otherChicken.getHeight() > this.getHeight()) {
return -1;
} else if (otherChicken.getHeight() < this.getHeight()) {
return 1;
}
return 0;
}
//
// ----------- GETTER METHODS ------------
// (also Accessor methods)
/**
* @return the height of the chicken, in centimeters
*/
public int getHeight() {
return height;
}
/**
*
* @return the weight of the chicken, in pounds
*/
public double getWeight() {
return weight;
}
/**
*
* @return
*/
public String getName() {
return name;
}
/**
*
* @return whether this chicken is a female
*/
public boolean isFemale() {
return isFemale;
}
//
// ------------- MUTATORS -----------
//
/**
* Feed the chicken. Side effects: the chicken grows in weight and height.
*/
public void feed() {
weight += .2;
height += 1;
}
//
// ------------- SETTERS ----------
//
/**
* Changes the name of the chicken
*
* @param n
* the name of the chicken
*/
public void setName(String n) {
name = n;
}
/**
* Sets the height of the chicken
*
* @param h
* the height of the chicken, in cm
*/
public void setHeight(int h) {
height = h;
}
/**
* Sets the weight of the chicken
*
* @param w
* the weight of the chicken, in pounds
*/
public void setWeight(double w) {
weight = w;
}
/**
* @param args
* the command-line arguments
*/
public static void main(String args[]) {
Chicken one = new Chicken("Fred", 38, 2.0, false);
Chicken two = new Chicken("Sallie Mae", 45, 3.0);
Chicken female = new Chicken("Lucille", 38, 2.0, true);
System.out.println(one.getName() + " weighs " + one.getWeight());
one.feed();
System.out.println(one.getName() + " ate, so he now weighs "
+ one.getWeight());
System.out.print(two.getName() + " is now ");
two.setName("The Divine Miss Sallie Mae");
System.out.println(two.getName());
// test toString method
System.out.println(one);
System.out.println(one + " equal to " + two + "? " + one.equals(two));
System.out.println(one + " equal to " + female + "? "
+ one.equals(female));
System.out.println(two + " equal to " + two + "? " + two.equals(two));
Chicken[] chickens = new Chicken[3];
chickens[0] = one;
chickens[1] = two;
chickens[2] = female;
// sort the chickens
Arrays.sort(chickens);
// print the chickens in sorted order (by height)
for (Chicken c : chickens) {
System.out.println(c);
}
}
}
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