// Example 110 from page 83

//

class Bank {

private int account1 = 10, account2 = 20;

synchronized public void transfer(int amount) {

int new1 = account1 - amount;

Util.pause(10);

account1 = new1; account2 = account2 + amount;

System.out.println("Sum is " + (account1+account2));

} }

class Clerk extends Thread {

private Bank bank;

public Clerk(Bank bank) { this.bank = bank; }

@Override

public void run() {

for (;;) { // Forever

bank.transfer(Util.random(-10, 10)); // transfer money

Util.pause(200, 300); // then take a break

} } }

class Example110 {

public static void main(String[] args) {

Bank bank = new Bank();

new Clerk(bank).start(); new Clerk(bank).start();

} }