java-如何使用方法从数组中返回随机字符串？

Question

I need to make a method that randomly chooses one of the strings in my "carmake" array. I am stuck in my setCarMake method. The same applies for the color of the car(that method will be made after i finish this one). Here is my current code.

public class Cars {

    public String[] carmake = {"Audi", "BMW" , "Mercedes-Benz", "Lexus", "Volkswagen"};
    public String[] carcolor = {"Black", "Yellow", "Red", "Grey"};
    //
    public int caryear;
    public int speed;

    public void setCarMake(){
        Random rand = new Random(14335);
        carmake.rand.nextInt(carmake.length);
    }

    public int GetYear(){
        int max = 2015;
        int min = 1999;

        Random rand = new Random();
        caryear = rand.nextInt((max-min)+1) + min ;
        return caryear;
    }

    public void execute(){
        System.out.println(caryear + " " + carmake);
    }
}

Please help!

Answer 1

This is wrong:

carmake.rand.nextInt(carmake.length);

Because it means that rand is an method of carmake array?? Doesn't make sense, right? That's what dot . operator does. They are used to access method.

Try this:

int carMakeRandomIndex = new Random().nextInt(carmake.length);
return carmake[carMakeRandomIndex];

Also, please follow the naming convention.

Answer 2

我认为您只需要获取数组范围内的随机数（0到carmake.length-1），然后将其用作数组索引即可。

rand.nextInt(carmake.length); //This should work

Answer 3

Here is an approach to obtain a random element from the carmake array:

final int randomIndex = rand.nextInt() % rcarmake.length;
return carmake[randomIndex];