Lokesh
Posted in : Java Beginners
Write a multi-threaded Java program to print all numbers below 100,000 that are both prime and fibonacci number (some examples are 2, 3, 5, 13, etc.). Design a thread that generates prime numbers below 100,000 and writes them into a pipe. Design another thread that generates fibonacci numbers and writes them to another pipe. The main thread should read both the pipes to identify numbers common to both.

August 20, 2010 at 1:45 PM

Hi Friend,

Try the following code:

import java.io.*;
import java.util.*;

private PipedWriter pw;

this.pr = pr;
this.pw = pw;
}

public void run() {
try {
int i;
for (i=1;i<10;i++)
{
int j;
for (j=2; j<i; j++)
{
int n = i%j;
if (n==0)
{
break;
}
}
if(i == j)
{
pw.write(i+"\n");
}
}

pw.close();

} catch (IOException e) {
}
}
}

private PipedWriter pw;

this.pr = pr;
this.pw = pw;
}
public void run() {
try {
int f1, f2 = 1, f3 = 1;
for (int i = 1; i <10; i++) {
pw.write(f3+"\n");
f1 = f2;
f2 = f3;
f3 = f1 + f2;
}
pw.close();
} catch (IOException e) {
}
}
}
public static void main(String[] args) throws Exception {
ArrayList list1=new ArrayList();
ArrayList list2=new ArrayList();
PipedWriter pw1 = new PipedWriter();
System.out.println("Prime Numbers: ");
mt1.start();
int item1;
while ((item1 = pr1.read()) != -1){
char ch1=((char) item1);
System.out.print(Character.toString(ch1));
}
pr1.close();
PipedWriter pw2 = new PipedWriter();
System.out.println("Fibonacci Numbers: ");
mt2.start();
int item2;
while ((item2 = pr2.read()) != -1){
char ch2=((char) item2);
System.out.print(Character.toString(ch2));
}
pr2.close();
System.out.println("Elements common to both lists are:");
list1.retainAll(list2);
for(int i=0;i<list1.size();i++){
System.out.print(list1.get(i));
}

}
}

Thanks

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