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ch02_TipCalculation.java
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ch02_TipCalculation.java
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import java.util.ArrayList;
import java.util.List;
// Coffee Break exercise
public class ch02_TipCalculation {
class TipCalculatorBad { // named TipCalculator in the book
private List<String> names = new ArrayList<>();
private int tipPercentage = 0;
public void addPerson(String name) {
names.add(name);
if(names.size() > 5) {
tipPercentage = 20;
} else if(names.size() > 0) {
tipPercentage = 10;
}
}
public List<String> getNames() {
return names;
}
public int getTipPercentage() {
return tipPercentage;
}
}
class TipCalculatorCopying { // named TipCalculator in the book
private List<String> names = new ArrayList<>();
private int tipPercentage = 0;
public void addPerson(String name) {
names.add(name);
if(names.size() > 5) {
tipPercentage = 20;
} else if(names.size() > 0) {
tipPercentage = 10;
}
}
public List<String> getNames() {
return new ArrayList<>(names);
}
public int getTipPercentage() {
return tipPercentage;
}
}
class TipCalculatorRecalculating { // named TipCalculator in the book
private List<String> names = new ArrayList<>();
public void addPerson(String name) {
names.add(name);
}
public List<String> getNames() {
return new ArrayList<>(names);
}
public int getTipPercentage() {
if(names.size() > 5) {
return 20;
} else if(names.size() > 0) {
return 10;
}
return 0;
}
}
static class TipCalculator {
public List<String> addPerson(List<String> names, String name) {
List<String> updated = new ArrayList<>(names);
updated.add(name);
return updated;
}
public static int getTipPercentage(List<String> names) {
if(names.size() > 5) {
return 20;
} else if(names.size() > 0) {
return 10;
}
return 0;
}
}
static class TipCalculatorV2 { // named TipCalculator in the book
public static int getTipPercentage(List<String> names) {
if(names.size() > 5) {
return 20;
} else if(names.size() > 0) {
return 10;
} else return 0;
}
}
public static void main(String[] args) {
List<String> names = new ArrayList<>();
assert(TipCalculator.getTipPercentage(names) == 0);
System.out.println(TipCalculator.getTipPercentage(names));
assert(TipCalculatorV2.getTipPercentage(names) == 0);
System.out.println(TipCalculatorV2.getTipPercentage(names));
names.add("Alice");
names.add("Bob");
names.add("Charlie");
assert(TipCalculator.getTipPercentage(names) == 10);
System.out.println(TipCalculator.getTipPercentage(names));
assert(TipCalculatorV2.getTipPercentage(names) == 10);
System.out.println(TipCalculatorV2.getTipPercentage(names));
names.add("Daniel");
names.add("Emily");
names.add("Frank");
assert(TipCalculator.getTipPercentage(names) == 20);
System.out.println(TipCalculator.getTipPercentage(names));
assert(TipCalculatorV2.getTipPercentage(names) == 20);
System.out.println(TipCalculatorV2.getTipPercentage(names));
}
}