Question

Write a class encapsulating the concept of daily temperatures for a week with a single dimensional array of temperatures. Write the following methods: • A constructor accepting an array of seven temperatures as a parameter. • Accessor, mutator, toString() and equals() methods • A method returning how many temperatures were below freezing. • A method returning an array of temperatures above 100 degrees. • A method returning the largest change in temperature between any two consecutive days. • A method returning an array of daily temperatures, sorted in descending order (use one of the sorting algorithms in the textbook. Write a client class to test all the methods in your class.

Answer 1

Temperature.java

package package1;

import java.util.ArrayList;

import java.util.List;

public class Temperature {

double[] temperatures;

int NUMOFTEMP=7;

//Constructor

public Temperature(double[] temperatures){

this.temperatures=temperatures;

}

//Accessor and mutators

public double[] getTemperatures() {

return temperatures;

}

public void setTemperatures(double[] temperatures) {

this.temperatures = temperatures;

}

//toString method to print array

public String toString(){

String output="Daily temperatures for a week: \n";

for(int i=0;i<NUMOFTEMP;i++){

output+=temperatures[i]+" ";

}

return output;

}

//equals method to check if two arrays are equal

public boolean equals(Object o){

//Check passed object is an instance of Temperature class

if(o instanceof Temperature){

Temperature temp=(Temperature)o;

//Check if temperature array is equal to array of passed object. If yes, return true else false

if(temp.getTemperatures()==temperatures)

return true;

else

return false;

}

return false;

}

public int belowFreezing(){

int temperatureBelowFreezing=0;

//Iterate over the temperatures array

for(int i=0;i<NUMOFTEMP;i++){

//If temperature is less than 0, increment temperatureBelowFreezing

if(temperatures[i]<0){

temperatureBelowFreezing+=1;

}

}

//return temperatureBelowFreezing

return temperatureBelowFreezing;

}

public double[] tempAbove100(){

//List to store temperatures above 100

List<Double> temp=new ArrayList<Double>();

//Iterate over the temperatures array

for(int i=0;i<NUMOFTEMP;i++){

//If temperature is >100,add it to list

if(temperatures[i]>100){

temp.add(temperatures[i]);

}

}

//Create an array to store temperatures of list size

double[] temperatureAbove100=new double[temp.size()];

//Iterate over list and add temperature to new array

for(int i=0;i<temp.size();i++){

temperatureAbove100[i]=(double)temp.get(i);

}

//return array

return temperatureAbove100;

}

public double largestChange(){

//This variable represents largest change

double max=0;

//Iterate over the temperatures array

for(int i=0;i<NUMOFTEMP-1;i++){

//Check if difference between consecutive temperature > current max

if(temperatures[i+1]-temperatures[i]>max){

max=temperatures[i+1]-temperatures[i];

}

}

return max;

}

public double[] sortedTemp(){

//Used Bubble sort to sort temperature array in descending order

for(int i=0;i<NUMOFTEMP;i++){

for(int j=1;j<NUMOFTEMP-i;j++){

if(temperatures[j-1]<temperatures[j]){

double temp=temperatures[j-1];

temperatures[j-1]=temperatures[j];

temperatures[j]=temp;

}

}

}

//return sorted array

return temperatures;

}

}

TemperatureTester.java

package package1;

public class TemperatureTester {

public static void main(String[] args) {

double[] temperatures={23.4,25,101,-2,-4,104,67};

Temperature tempObj=new Temperature(temperatures);

//This will print all the temperatures

System.out.println(tempObj);

//Calculate temperature below freezing point

int belowFreezing=tempObj.belowFreezing();

System.out.println("Total temperatures below freezing point : "+belowFreezing);

// Temperature above 100 degrees

double[] temps=tempObj.tempAbove100();

System.out.println("Temperature above 100 degress : ");

for(int i=0;i<temps.length;i++){

System.out.print(temps[i]+" ");

}

//Calculate largest change

double largestChange=tempObj.largestChange();

System.out.println("\nLargest change in temperature between two consecutive days : "+largestChange);

//Sort temperatures

double[] sortedTemps=tempObj.sortedTemp();

System.out.println("Temperature in sorted manner: ");

for(int i=0;i<sortedTemps.length;i++){

System.out.print(sortedTemps[i]+" ");

}

//Check equality of two temperature objects

if(sortedTemps.equals(tempObj)){

System.out.println("\nTemperature arrays are equal");

}else{

System.out.println("\nTemperature arrays are not equal");

}

}

}

OUTPUT-

TemperatureTester [Java Application] C:\Program FilesJava\jdk1.8.0_121 binljavaw.exe (C aily temperatures for a week: 23.4 25.0 101.0-2.0-4.0 104.0 67.0 Total temperatures below freezing point : 2 Temperature above 100 degress 101.0 104.0 Largest change in temperature between two consecutive days 108.0 Temperature in sorted manner: 104.0 101.0 67.0 25.0 23.4 -2.0-4.0 Temperature arrays are not equal