一直报错：Fatal exception occurred，program will exit··为什么？怎么解决？

[popes_love]

原代码如下：
package test;

interface Shape2D{
double pi = 3.14;
double area();
}
class Circle implements Shape2D{
double radius;
public Circle(double r){
radius = r;
}
public double area(){
return (pi*radius*radius);
}
}
class Rectangle implements Shape2D{
int width,height;
public Rectangle(int w,int h){
width = w;
height = h;
}
public double area(){
return width*height;
}
}
public class InterfaceTester{
public static void main(){
Rectangle rect = new Rectangle(5,6);
System.out.println("Area of rect = "+ rect.area());
Circle cir = new Circle(2.0);
System.out.println("Area of cir = "+ cir.area());
}
}

[昵称很不好取]

public static void main(String []args){
忘了参数了

[学习Java中]

public static void main(){
->public static void main(String args[]) {

[popes_love]

···崩溃 检查了好久··--!