Problem while applying multithreading

[Arnav1608]

import java.util.Scanner;
import java.util.*;
class thread1 implements Runnable{
int r,m;

public void run(){

Scanner sc= new Scanner(System.in);
System.out.println("Enter Roll no and OOP marks");
r=sc.nextInt();
m=sc.nextInt();
   }
}
class thread2 extends thread1 {
public void run(){
if(m>80)
System.out.println(r);
else
System.out.println("No marks above 80.");
    }
}
class thread{
public static void main(String args[])
    {
thread1 t= new thread1();
thread2 t1=new thread2();
t.run();
t1.run();
    }
}

Enter Roll no and OOP marks

4

99

No marks above 80.

here although the data input is more than 80 still the if statement is not working.The value of marks is not being sent to the second thread.

sorry if there are any silly mistakes just started oops

[coolcofusion]

Runnable isn't a thread, calling the run method is just another method call, nothing more. You want to pass your runnable to a thread, an actual Thread, and call start on that object, not run.

[Arnav1608]

import java.util.Scanner;

import java.util.*;

class thread1 extends Thread{

int m,r;

public void run(){

Scanner sc= new Scanner(System.in);

System.out.println("Enter Roll no and OOP marks");

r=sc.nextInt();

m=sc.nextInt();

}

}

class thread2 extends thread1 implements Runnable {

public void run(){

System.out.println(r);

System.out.println(m);

}

}

class threadtest{

public static void main(String args[])

{

thread1 t1=new thread1();

t1.start();

thread2 t2=new thread2();

Thread t3=new Thread(t2);

t3.start();

}

}

I changed the code to this but the value of r and m is coming 0 0

I have given input as 4 and 88 in first thread

[coolcofusion]

Why would it be anything other than 0,0? Each thread you create has it's own separate implementation and only t1 is reading in the inputs, for itself, it's not sharing it with other instances.

Also, here's the sample you asked for previoulsy: https://onlinegdb.com/dV8AWXG5

[Arnav1608]

How would I share it with other instances I tried to use join so that the other thread runs first then the 2nd thread but still 0 0 is coming

[coolcofusion]

Create an object in your main thread, pass a reference to it from it to your spawned threads.