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prameshbhattarai/Callback.java

Created September 17, 2018 10:20
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example of calling async callback function in java --fun--
Raw
Callback.java
package com.callback.fun;
import java.util.function.Consumer;
public class Callback {
private static final double salary = 75_000;
private static void getSalary(Consumer<Double> callback) {
System.out.println("get salary invoked");
new Thread(() -> {
Async.task(1000);
callback.accept(Callback.salary);
}).start();
}
private static void subtractTax(double salary, Consumer<Double> callback) {
System.out.println("subtract tax invoked");
new Thread(() -> {
Async.task(1000);
callback.accept(salary * 0.75);
}).start();
}
private static void subtractRent(double afterTaxSalary, Consumer<Double> callback) {
System.out.println("subtract rent invoked");
new Thread(() -> {
Async.task(1000);
callback.accept(afterTaxSalary - 20_000);
}).start();
}
private static void getDisposableIncome(Consumer<Double> callback) {
System.out.println("get disposable income invoked");
new Thread(() -> {
Async.task(1000);
getSalary((totalSalary) -> {
subtractTax(totalSalary, (afterTaxSalary) -> {
subtractRent(afterTaxSalary, callback::accept);
});
});
}).start();
}
public static void main(String... args) {
Callback.getDisposableIncome((disposableIncome) -> {
System.out.println("Our final disposable income is " + disposableIncome);
});
}
private static class Async {
static void task(int milliSeconds) {
try {
Thread.sleep(milliSeconds);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
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