public class Species
1:
2:
3: import java.util.*;
4:
5: /**
6: Class for data on endangered species.
7: */
8: public class Species
9: {
10: private String name;
11: private int population;
12: private double growthRate;
13:
14: public void readInput( )
15: {
16: Scanner keyboard = new Scanner(System.in);
17: System.out.println("What is the species' name?");
18: name = keyboard.nextLine( );
19:
20: System.out.println(
21: "What is the population of the species?");
22: population = keyboard.nextInt( );
23: while (population < 0)
24: {
25: System.out.println("Population cannot be negative.");
26: System.out.println("Reenter population:");
27: population = keyboard.nextInt( );
28: }
29:
30: System.out.println(
31: "Enter growth rate (percent increase per year):");
32: growthRate = keyboard.nextDouble( );
33: }
34:
35: public void writeOutput( )
36: {
37: System.out.println("Name = " + name);
38: System.out.println("Population = " + population);
39: System.out.println("Growth rate = " + growthRate + "%");
40: }
41:
42: /**
43: Precondition: years is a nonnegative number.
44: Returns the projected population of the calling object
45: after the specified number of years.
46: */
47: public int projectedPopulation(int years)
48: {
49: double populationAmount = population;
50: int count = years;
51: while ((count > 0) && (populationAmount > 0))
52: {
53: populationAmount = (populationAmount +
54: (growthRate/100) * populationAmount);
55: count--;
56: }
57: if (populationAmount > 0)
58: return (int)populationAmount;
59: else
60: return 0;
61: }
62:
63: public void set(String newName, int newPopulation,
64: double newGrowthRate)
65: {
66: name = newName;
67: if (newPopulation >= 0)
68: population = newPopulation;
69: else
70: {
71: System.out.println("ERROR: using a negative population.");
72: System.exit(0);
73: }
74: growthRate = newGrowthRate;
75: }
76:
77: public String getName( )
78: {
79: return name;
80: }
81:
82: public int getPopulation( )
83: {
84: return population;
85: }
86:
87: public double getGrowthRate( )
88: {
89: return growthRate;
90: }
91:
92: public boolean equals(Species otherObject)
93: {
94: return ((name.equalsIgnoreCase(otherObject.name))
95: && (population == otherObject.population)
96: && (growthRate == otherObject.growthRate));
97: }
98: }