# The Computer LanguageBenchmarks Game

## mandelbrot Java #6 program

### source code

```/* The Computer Language Benchmarks Game
* http://benchmarksgame.alioth.debian.org/
*
* contributed by Stefan Krause
* slightly modified by Chad Whipkey
* parallelized by Colin D Bennett 2008-10-04
* reduce synchronization cost by The Anh Tran
* optimizations and refactoring by Enotus 2010-11-11
*/

import java.io.*;
import java.util.concurrent.atomic.AtomicInteger;

public final class mandelbrot {
static byte[][] out;
static AtomicInteger yCt;
static double[] Crb;
static double[] Cib;

static int getByte(int x, int y){
double Ci=Cib[y];
int res=0;
for(int i=0;i<8;i+=2){
double Zr1=Crb[x+i];
double Zi1=Cib[y];

double Zr2=Crb[x+i+1];
double Zi2=Cib[y];

int b=0;
int j=49;do{
double nZr1=Zr1*Zr1-Zi1*Zi1+Crb[x+i];
double nZi1=Zr1*Zi1+Zr1*Zi1+Cib[y];
Zr1=nZr1;Zi1=nZi1;

double nZr2=Zr2*Zr2-Zi2*Zi2+Crb[x+i+1];
double nZi2=Zr2*Zi2+Zr2*Zi2+Cib[y];
Zr2=nZr2;Zi2=nZi2;

if(Zr1*Zr1+Zi1*Zi1>4) b|=2;
if(Zr2*Zr2+Zi2*Zi2>4) b|=1;
if(b==3) break;
}while(--j>0);
res=(res<<2)+b;
}
return res^-1;
}

static void putLine(int y, byte[] line){
for (int xb=0; xb<line.length; xb++)
line[xb]=(byte)getByte(xb*8,y);
}

public static void main(String[] args) throws Exception {
int N=6000;
if (args.length>=1) N=Integer.parseInt(args[0]);

Crb=new double[N+7]; Cib=new double[N+7];
double invN=2.0/N; for(int i=0;i<N;i++){ Cib[i]=i*invN-1.0; Crb[i]=i*invN-1.5; }
yCt=new AtomicInteger();
out=new byte[N][(N+7)/8];

for (int i=0;i<pool.length;i++)
public void run() {
int y; while((y=yCt.getAndIncrement())<out.length) putLine(y,out[y]);
}
};

OutputStream stream = new BufferedOutputStream(System.out);
stream.write(("P4\n"+N+" "+N+"\n").getBytes());
for(int i=0;i<N;i++) stream.write(out[i]);
stream.close();
}
}

```

### notes, command-line, and program output

```NOTES:
java 10 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)

Wed, 21 Mar 2018 18:10:12 GMT

MAKE:
mv mandelbrot.java-6.java mandelbrot.java
/opt/src/jdk-10/bin/javac -d .  mandelbrot.java

1.10s to complete and log all make actions

COMMAND LINE:
/opt/src/jdk-10/bin/java   mandelbrot 16000

(BINARY) PROGRAM OUTPUT NOT SHOWN
```