java - 分配一个 int 名称以从字符串数组中选择一个单词

Question

这是我用来创建随机名称的类，但其中一行不断出现错误(不是主类)

public class nameGenerator {

String [] namesFirst= {"Micheal","Stewart","Robbinson","Tang"};
String [] namesMiddle= {"Jordan","James","Stanly","Choo" };
String [] namesLast= {"IV","Lee","Persson"};


int a = namesFirst.length;
int b = namesMiddle.length;
int c = namesLast.length;


int x = (int) (Math.random()* a);
int y = (int) (Math.random()* b);   
int z = (int) (Math.random()* c);



System.out.println(namesFirst[x] + namesMiddle[y] + namesLast[z]);
//the error is here /\



}

Answer 1

哦，使用方法在这里。您不能在方法之外使用 System.out.println()。

System.out.println(namesFirst[x] + namesMiddle[y] + namesLast[z]); 
// put inside a method

您必须按如下方式更改代码

public class nameGenerator { 
public static void main(String[] args) {
    String [] namesFirst= {"Micheal","Stewart","Robbinson","Tang"};
    String [] namesMiddle= {"Jordan","James","Stanly","Choo" };
    String [] namesLast= {"IV","Lee","Persson"};

    int a = namesFirst.length;
    int b = namesMiddle.length;
    int c = namesLast.length;
    int x = (int) (Math.random()* a);
    int y = (int) (Math.random()* b);
    int z = (int) (Math.random()* c);

    System.out.println(namesFirst[x] + namesMiddle[y] + namesLast[z]);
 }
}