如何在Java的lambda表达式中使用IntSupplier?
一个IntSupplier 是在定义的官能接口“java.util.function”包。此接口表示一个 不带参数的操作,并返回int 类型的结果。IntSupplier 接口只有一个方法getAsInt() 并返回结果。此功能接口可用作lambda 表达式 或方法 引用的分配目标。
语法
@FunctionalInterface public interface IntSupplier { int getAsInt(); }
示例
import java.util.function.IntSupplier; public class IntSupplierTest { public static void main(String[] args) { IntSupplier intSupplier1 = () -> Integer.MAX_VALUE; // lamba expression System.out.println("The maximum value of an Integer is: " + intSupplier1.getAsInt()); IntSupplier intSupplier2 = () -> Integer.MIN_VALUE; System.out.println("The minimum value of an Integer is: " + intSupplier2.getAsInt()); int a = 10, b = 20; IntSupplier intSupplier3 = () -> a*b; System.out.println("The multiplication of a and b is: " + intSupplier3.getAsInt()); } }
输出结果
The maximum value of an Integer is: 2147483647 The minimum value of an Integer is: -2147483648 The multiplication of a and b is: 200