Java 靜態初始化區塊(Static initialization block)

When you want to initialize a static or instance variable in a more complicated way, you can use block to achieve this goal.

public class StaticInitBlockDemo {

    static double[] arra = null;
    static {
        int size = 5;
        array = new double[size];
        for (int i = 0; i < array.length; i++) {
            array[i] = Math.random();
        }
    }

    public static void main(String[] args){
        for(int i =0 ;i<array.length;i++ ){
            System.out.println(array[i]);
        }
    }
}

Static Variable