如何在 Java 中将 lambda 表达式作为方法参数传递?
lambda 表达式是 Java 中的匿名或无名方法。它不会自行执行,用于实现函数式接口中声明的方法。如果我们想将 lambda 表达式作为方法参数传递给 Java,那么接收的方法参数类型必须为函数式接口类型。
示例
interface Algebra {
int operate(int a, int b);
}
enum Operation {
ADD, SUB, MUL, DIV
}
public class LambdaMethodArgTest {
public static void main(String[] args) {
print((a, b) -> a + b, Operation.ADD);
print((a, b) -> a - b, Operation.SUB);
print((a, b) -> a * b, Operation.MUL);
print((a, b) -> a / b, Operation.DIV);
}
static void print(Algebra alg, Operation op) {
switch (op) {
case ADD:
System.out.println("The addition of a and b is: " + alg.operate(40, 20));
break;
case SUB:
System.out.println("The subtraction of a and b is: " + alg.operate(40, 20));
break;
case MUL:
System.out.println("The multiplication of a and b is: " + alg.operate(40, 20));
break;
case DIV:
System.out.println("The division of a and b is: " + alg.operate(40, 20));
break;
default:
throw new AssertionError();
}
}
}输出
The addition of a and b is: 60 The subtraction of a and b is: 20 The multiplication of a and b is: 800 The division of a and b is: 2
广告
数据结构
网络
RDBMS
操作系统
Java
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP