--------sum of prime numbers -----------

public class summ implements Runnable{ private long start; private long end; public long summation;

public summ(long start,long end){
    this.start=start;
    this.end=end;
}

public void run(){
    long summation=0;
    for(long i=start;i<=end;i++){
        int num=0;
        for(int j=2;j<i/2;j++){
            if(i%j==0){
            num=1;
            }
        }
        if(num==0){

            summation=summation+i;
        }
    }
    this.summation= summation;
}

}

public class Main { public static void main(String[] args){

    long num=100;
    long start=0;
    long end=(int) num/4;
    long temp=(int) num/4;

    summ s1=new summ(start,end);

    start=end+1;
    end=start+temp;
    summ s2=new summ(start,end);

    start=end+1;
    end=temp+start;
    summ s3=new summ(start,end);

    start=end+1;
    end=temp+start;
    summ s4=new summ(start,end);

    Thread t1=new Thread(s1);
    Thread t2=new Thread(s2);
    Thread t3=new Thread(s3);
    Thread t4=new Thread(s4);


    t1.start();
    t2.start();
    t3.start();
    t4.start();

    try{
        t1.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }


    try{
        t2.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }


    try{
        t3.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }


    try{
        t4.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }

    long summation=s1.summation+s2.summation+s3.summation+s4.summation;
    System.out.print("sum of prime numbers: ");
    System.out.print(summation);

}

}

---------------------bank-------------------

import java.util.concurrent.*; class jointacc{ private int balance; public jointacc(int balance){ this.balance=balance; } public synchronized void deposit(int x){ this.balance=balance+x; } public synchronized void enquire(String name){ System.out.println(this.balance + name); } }

class cust implements Runnable{ private jointacc acc; private String name; private int depo; public cust(String name,int depo,jointacc acc){ this.name=name; this.depo=depo; this.acc=acc; } public void run(){ acc.deposit(this.depo); acc.enquire(this.name); }

}

class bank{ public static void main(String[] args){ jointacc acc = new jointacc(100); cust c1=new cust("yash",100,acc); cust c2=new cust("sash",200,acc); cust c3=new cust("hash",300,acc);

    // ExecutorService executor=Executors.newCachedThreadPool();
    ExecutorService executor=Executors.newFixedThreadPool(4);

    executor.execute(c1);
    executor.execute(c2);
    executor.execute(c3);
    executor.shutdown();
}

}

---------------------sum of 100 numbers----------------

class summ implements Runnable{ private long start; private long end; public long summation;

public summ(long start,long end){
    this.start=start;
    this.end=end;
}

public void run(){
    long summation=0;
    for(long i=start;i<=end;i++){
        summation=summation+i;  
    }
    this.summation= summation;
}

}

public class Mainn { public static void main(String[] args){

    summ s1=new summ(0,25);
    summ s2=new summ(26,50);
    summ s3=new summ(51,75);
    summ s4=new summ(76,100);

    Thread t1=new Thread(s1);
    Thread t2=new Thread(s2);
    Thread t3=new Thread(s3);
    Thread t4=new Thread(s4);


    t1.start();
    t2.start();
    t3.start();
    t4.start();

    try{
        t1.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }


    try{
        t2.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }


    try{
        t3.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }


    try{
        t4.join();
    }catch(InterruptedException e){
        System.out.print("error");
    }

    long summation=s1.summation+s2.summation+s3.summation+s4.summation;
    System.out.print("sum of prime numbers: ");
    System.out.print(summation);

}

}