Question

我在C中有以下代码，而且我对Java知之甚少。

我想知道是否有任何方法可以在Java中创建下面代码中显示的结构。我想我们可以在Java中使用class来完成它，但我在Java Classes中遇到的问题是我无法声明人[10]，即这样一个结构的数组。

struct people{
float height;
float weight;
int age;
}people[10];

int main()       // this part of code is just to show how I can access all those elements of struct
{
    int i;
    for(i=0;i<10;i++)
    {
        people[i].height = rand()%7;
        people[i].weight = rand()%80;
        people[i].age = rand()%100;
    }
    for(i=0;i<10;i++)
    {
        printf(" %f %f %d\n",people[i].height,people[i].weight,people[i].age);
    }
return 0;
}

Answer 1

在 C ++ 中，您可以静态分配对象..

struct People
{
    // struct members are public by default
    float height;
    float weight;
    int age;
}
people[10]; // array of 10 objects

int main ()
{
    // fill some data
    people[0].age = 15;
    people[0].height = 1.60;
    people[0].weight = 65;

    return 0;
}

但是在 Java 中，你必须动态分配对象，并且创建数组不会分配对象，它只会分配一个引用数组。

package Example;

private class People
{
    // define members as public
    public float height;
    public float weight;
    public int age;
}

class Main
{
    public static main (String [] args)
    {
        // array of 10 references
        People [] p = new People [10];

        // allocate an object to be referenced by each reference in the array
        for (int i=0; i<10; i++)
        {
            p[i] = new People();
        }

        // fill some data
        people[0].age = 15;
        people[0].height = 1.60;
        people[0].weight = 65;
    }
}

Answer 2

我将如何做到这一点：

public class Person {
    public float height;
    public float weight;
    public int age;

    private static Person[] people = new Person[10];

    public static void main(String[] args) {
        java.util.Random r = new java.util.Random();

        for (int i = 0; i < 10; ++i) {
            people[i] = new Person();
            people[i].height = r.nextInt(7);
            people[i].weight = r.nextInt(80);
            people[i].age = r.nextInt(100);
        }
        for(int i = 0; i < 10; ++i) {
            System.out.printf(" %f %f %d\n",
                people[i].height, people[i].weight, people[i].age);
        }
    }
}

Answer 3

public class Person{

private float height;
private float weight;
private int age;

public Person(float height, float weight, int age)
{
   this.height = height;
   this.weight = weight;
   this.age = age;
}

public float getHeight() { return height;}
...
...


public static void main(String[] args)
{
 int N=10;
 Person[] people = new Person[N];
 for(int i=0; i<N; i++)
   people[i] = new Person( ... , ... , ...)

}

}

Answer 4

你应该使用课程。为了创造人，你必须创建该类的对象。

    people [] p  = new people[10];
    for(people person : p )
    {
         //each object is defined.
         p = new People(h,w,age);
    }

   class People{
        People(int h, int w, int a)
        {
            height=h; weight=w; age=a;
        }
    float height;
    float weight;
    int age;
    }

Java中的C / C ++结构类比？

4 个答案: