利用概率的方法求圆周率
public class Test12 { public static void main(String[] args) { Square[] arr = new Square[1000000]; double x; double y; boolean flag; double count = 0; double sum; for(int i = 0;i < 1000000;i ++){ x = Math.random() * 2; y = Math.random() * 2; Square s = new Square(x,y); arr[i] = s; } for (int j = 0;j < 1000000;j ++){ flag = Cal(arr[j].x,arr[j].y); if(flag){ count++; } } sum=count/1000000; System.out.println(sum); System.out.println(Math.PI/4); } public static boolean Cal(double x,double y){ double z = (x-1)*(x-1) + (y-1)*(y-1); System.out.println(z); return Math.sqrt(z) < 1; } } class Square{ double x; double y; Square(double x,double y){ this.x = x; this.y = y; } }