"Clean" Code, Horrible Performance
"Clean" Code, Horrible Performance - YouTube
loaded 10000000 Shapes
copied to arrays 3332483 3332550 3334967 ?=? 10000000 : 6664966 ,6665100 ,3334967
6664966 , 6665100 , 3334967
TotalArea1=4.741709582246646E8 in millis: 252
TotalArea2=4.741709582246208E8 in millis: 30 ok....!!!!!!
lesson learned!!!!!
BUILD SUCCESSFUL (total time: 4 seconds)
-------------------------------
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package testcleancode;
import java.util.Random;
import java.util.Vector;
/**
*
* @author dimitrak
* https://www.youtube.com/watch?v=tD5NrevFtbU
*/
public class TestCleanCode {
static Random r=new Random();
static Vector<Sx> v=new Vector<>();
static double rv[];
static double tv[];
static double cv[];
static int lr=0,lt=0,lc=0;
static int ir=0,it=0,ic=0;
/**
* @param args the command line arguments"Clean" Code, Horrible Performance
*/
public static void main(String[] args) {
// TODO code application logic here
prepareVect();
test1();
test2();
}
static void prepareVect(){
int sxCount=10000000;
int i=0;
while(i<sxCount){
int type=r.nextInt(3);
if(type>0){
if(type>1){
v.add(new Cir());
++lc;
}
else{
v.add(new Tri());
++lt;
}
}
else{
v.add(new Rec());
++lr;
}
++i;
}
System.out.println("loaded "+sxCount+" Shapes");
rv=new double[2*lr];
tv=new double[2*lt];
cv=new double[lc];
i=0;
while(i<sxCount){
Sx s=v.get(i);
if(s instanceof Rec){
Rec rec =(Rec)s;
rv[ir]=rec.w;
++ir;
rv[ir]=rec.h;
++ir;
}
else if(s instanceof Tri){
Tri tri =(Tri)s;
tv[it]=tri.w;
++it;
tv[it]=tri.h;
++it;
}
else{
Cir cir =(Cir)s;
cv[ic]=cir.r;
++ic;
}
++i;
}
System.out.println("copied to arrays "+lr+" "+lt+" "+lc+" ?=? "+(lc+lr+lt)+" : "+rv.length+" ,"+tv.length+" ,"+cv.length);
System.out.println(ir+" , "+it+" , "+ic);
}
static void test2(){
double totArea2=0;
int i=0;
double w,h;
long t2s=System.currentTimeMillis();
i=0;
while(i<rv.length){
w=rv[i];
++i;
h=rv[i];
++i;
totArea2+=w*h;
//System.out.println("rec("+w+","+h+")="+(w*h));
}
i=0;
while(i<tv.length){
w=tv[i];
++i;
h=tv[i];
++i;
totArea2+=(w*h)/2.0;
}
i=0;
while(i<cv.length){
w=cv[i];
++i;
h=w;
totArea2+=Math.PI*w*h;
}
long t2e=System.currentTimeMillis();
long t2=t2e-t2s;
System.out.println("TotalArea2="+totArea2+" in millis: "+t2);
}
static void test1(){
int i=0;
int l=v.size();
double totArea1=0;
long t1s=System.currentTimeMillis();
while(i<l){
totArea1+=v.get(i).area();
++i;
}
long t1e=System.currentTimeMillis();
long t1=t1e-t1s;
System.out.println("TotalArea1="+totArea1+" in millis: "+t1);
}
}
abstract class Sx{
public abstract double area();
}
class Rec extends Sx{
public Rec(){
w=10*TestCleanCode.r.nextDouble();
h=10*TestCleanCode.r.nextDouble();
}
double w,h;
public double area(){
//System.out.println("Rec("+w+","+h+")="+(w*h));
return w*h;
}
}
class Tri extends Sx{
public Tri(){
w=10*TestCleanCode.r.nextDouble();
h=10*TestCleanCode.r.nextDouble();
}
double w,h;
public double area(){
return (w*h)/2.0;
}
}
class Cir extends Sx{
double r;
public Cir(){
r=10*TestCleanCode.r.nextDouble();
}
public double area(){
return Math.PI*r*r;
}
}
