java - 如何在JAVA中动态创建数组？

Question

我的问题非常简单，我想创建一个数组并用一些字符串项填充它。下面是一个简单代码，包含两个类和一个主要方法(非常基本的程序)。

public class CompanyDetails {
public static void main (String[] args){

    CompanyInput apple = new CoInput();
    apple.coDetailsSummary("Apple","USA", "NA");
    apple.computeNoOfJoinees();

    CompanyInput htc = new CoInput();
    htc.coDetailsSummary("HTC", "Thailand", "NA");
    htc.computeNoOfJoinees();

}

}

public class CompanyInput {
float noOfJoinees;
String companyName;
String address;
String phoneNumber;
int randomInt,randomInt1;
int noOfEmployees;
Array gh;

void coDetailsSummary(String companyName, String address, String phoneNumber) {
    // TODO Auto-generated method stub

    System.out.println("Company Name                              : "+companyName); 
    System.out.println("Address                                   : "+address); 
    System.out.println("Contact Information                       : "+phoneNumber); 

}
void computeNoOfJoinees(){
    float m1,m2, m3;
    Random randomGenerator = new Random();
    for (int idx = 1; idx <= 10; ++idx)
        randomInt = randomGenerator.nextInt(30);
        randomInt1 = randomGenerator.nextInt(20);

        m1 = randomInt;
        m2 = randomInt1;
    m3 = m1+m2/100;
    System.out.print("The number of joinees joining every month : "+m3);
    System.out.println("\n");
}

}

我想创建一个名称为“companyName”的数组，并用将作为输出给出的所有值填充它。

例如

Company Name                              : Apple
Address                                   : USA
Contact Information                       : NA
The number of joinees joining every month : 13.0

当我运行程序时，所有这些值都必须自动插入到数组中。结果应该是这样的

Apple[] = {Apple,USA,NA,13.0}

我怎样才能实现这个目标？

Answer 1

使用ArrayList，动态添加元素在您的例子中，它将是 CompanyInput 对象的 ArrayList。

ArrayList<CompanyInput>companyName = new ArrayList<CompanyInput>();
companyName.add(new CompanyInput("Apple","USA","NA",13.0));
companyName.add(new CompanyInput("MSoft","USA","NA",15.0));

等等...

希望有帮助!