如何在 Java 中将 lambda 表达式与函数式接口结合使用?
java 8object oriented programmingprogramming更新于 2025/4/24 14:22:17
lambda 表达式是匿名函数，没有任何返回类型、访问修饰符，也不属于任何类。它可用于简化函数式 接口中抽象方法的实现。只要有函数式接口，我们就可以使用 lambda 表达式代替匿名内部类。
语法
([comma seperated argument-list]) -> {body}
示例
@FunctionalInterface
interface BonusCalculator {
public double calcBonus(int amount);
}
class EmpDetails {
public void getBonus(BonusCalculator calculator, int amount) {
double bonus = calculator.calcBonus(amount);
System.out.println("Bonus: " + bonus);
}
}
public class LambdaExpressionTest {
public static void main(String[] args) {
EmpDetails details = new EmpDetails();
//使用匿名内部类
EmpDetails details = new EmpDetails();
details.getBonus(new BonusCalculator () {
public double calcBonus(int amount) {
System.out.println("Bonus Calculation of an Employee using Ananymous inner class");
return amount*2;
}
},2000);
// 使用 Lambda 表达式
details.getBonus((amount) -> {
System.out.println("Bonus Calculation of an Employee using Lambda Expression");
return amount*2;
},2000);
}
}
输出
Bonus Calculation of an Employee using Anonymous inner class Bonus: 4000.0 Bonus Calculation of an Employee using Lambda Expression Bonus: 4000.0
