我的课程可以编译，但无法正常运行！ （BlueJ）

Question

Okay so I will put in my code below this but let me explain. I am trying to find the value of vals[2][1]. But when I type in my code, it compiles, I hit void main(String[] args), but then nothing happens. It does not say error, it does not pop up a window. Why?

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

       double[][] vals = {{1.1, 1.3, 1.5},
                                 {3.1, 3.3, 3.5},
                                 {5.1, 5.3, 5.5},
                                 {7.1, 7.3, 7.5}};
                                }
    }

Answer 1

In Java, you actually need to write code to produce output.

For example, to print the value of vals[2][1] ... add this:

System.out.println(vals[2][1]);