好吧,所以我還是很新的,我不知道我的代碼是怎麼回事。它看起來不錯,但是當我嘗試運行它時,它給了我一個零錯誤的劃分?在一個頁面上我的老師計算人口密度:一個初學者指南
代碼1遞給我:
public class Country
{
// fields
private String name;
private int population;
private int area; // in square miles
// constructors
// methods
public String getName()
{
return name;
}
public int getPopulation()
{
return population;
}
public int getArea()
{
return area;
}
public void setName(String newName)
{
name = newName;
}
public void setPopulation(int newPopulation)
{
population = newPopulation;
}
public void setArea(int newArea)
{
area = newArea;
}
// population per square mile
public int populationDensity()
{
int density;
density = population/area; // integer division truncates
return density;
}
}
,另一個是我做:
public class A03
{
public static void main(String[] args)
{
Country country1 = new Country();
String newName = "Macau";
int newPopulation = 453000;
int newArea = 6;
int density = newPopulation/newArea;
country1.setName(newName);
country1.setPopulation(newPopulation);
country1.setArea(newArea);
System.out.printf("Name: " + country1.getName());
System.out.printf("%nPopulation: %,d ", country1.getPopulation());
System.out.printf("%nArea: "+ country1.getArea());
System.out.printf("%nPopulation Density: %,d", country1.populationDensity(), "%n");
System.out.println();
System.out.println();
Country country2 = new Country();
String name1 = "Libya";
int population1 = 5900000;
int area1 = 679358;
int density1 = population1/area1;
System.out.printf("Name: %s%n", name1);
System.out.printf("Population: %,d%n", population1);
System.out.printf("Area: %,d%n", area1);
System.out.printf("Population Density: %,d%", country2.populationDensity(), "%n");
System.out.println();
Country country3 = new Country();
String name2 = "USA";
int population2 = 298500000;
int area2 = 3539225;
int density2 = population2/area2;
System.out.printf("Name: %s%n", name2);
System.out.printf("Population: %,d%n", population2);
System.out.printf("Area: %,d%n", area2);
System.out.println();
}
}
有人能告訴我什麼是錯的?或者我做的那是錯的。我基本上覆制,粘貼,並改變我的變量,以適應下一個國家的人口密度。
你的國家2沒有面積... – njzk2 2015-02-05 20:58:56