How to use IntSupplier function in Java for numeric supplier operations

IntSupplier is a very convenient functional interface in Java 8 for providing integer values. It operates as a numeric provider, providing simple, reusable blocks of code, giving programmers greater flexibility when integer values ​​are required.

There is only one method getIntAsInt() in the IntSupplier interface. This method has no parameters and returns a value of type int. Its syntax is:

int getAsInt();

We can define an IntSupplier supplier:

public class ExampleIntSupplier implements IntSupplier {
    int sequence = 0;

    @Override
    public int getAsInt() {
        return sequence++;
    }
}

Taking the above code as an example, we can see that in the implementation of IntSupplier, we need to specify getIntAsInt( ) method should return the value. In the example, we define a sequence of integer values ​​that increases by 1 each time the integer value is obtained.

Now, in our application, we can use ExampleIntSupplier to generate a sequence of integers as follows:

ExampleIntSupplier intSupplier = new ExampleIntSupplier();
System.out.println(intSupplier.getAsInt()); // Output: 0
System.out.println(intSupplier.getAsInt()); // Output: 1

In the above code, we instantiate the ExampleIntSupplier and call The getAsInt() method was used twice, and the integer values ​​0 and 1 were output.

The IntSupplier interface is very flexible and can provide us with a large number of different supplier implementations. We can use a loop to construct a sequence of numbers for it, or we can use a random number generator to construct a sequence of random integers. The following is an example of using a loop to generate an integer sequence:

IntSupplier intSupplier = new IntSupplier() {
    int sequence = 0;

    @Override
    public int getAsInt() {
        return sequence++;
    }
};

for (int i = 0; i < 10; i++) {
    System.out.println(intSupplier.getAsInt());
}

The output result is:

0
1
2
3
4
5
6
7
8
9

In addition to IntSupplier, the Java 8 API also provides other supplier interfaces, such as DoubleSupplier and LongSupplier . They are used in exactly the same way as IntSupplier, you just need to distinguish the return value type.

Finally, through IntSupplier, we can define repeatedly used code blocks as functional interfaces and use Lambda expressions to pass parameters, making our programs more concise, readable and maintainable.

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