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Java Lambda Expressions - Java function Consumer Examples

Java Lambda Expressions Java 

import java.math.BigDecimal;
import java.util.Currency;
import java.util.concurrent.Executors;
import java.util.function.Consumer;

/**
* In this example main method calls retrieveExchangeRate which asynchronously
* replies back via Consumer call back.
*/
public class ConsumerExample {

public static void main(String[] args) {
retrieveExchangeRate(Currency.getInstance("USD"), (rate) -> System.out.println(rate));
}


public static void retrieveExchangeRate(Currency currency, Consumer<BigDecimal> rateConsumer) {

System.out.println("Retrieving rate for currency " + currency);
//just a test , no real exchange rate service call made.
Executors.newSingleThreadExecutor().submit(() ->
rateConsumer.accept(new BigDecimal(Math.round(Math.random() * 100))));

}
}
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