Java有参的Lambda表达式！

public class Main {
	
	// 首先定义一个函数式接口，它的返回值是int，两个参数也是int
	interface Shi{
		int func(int a, int b);
	}
	
	// 然后定义一个方法，来接收参数并输出结果。
	private static void suan(Shi shi, int a, int b) {
		System.out.println(shi.func(a, b));
	}
	
	public static void main(String[] args) {
		
		
		// 实现Shi，让他能够计算两数相乘的结果，并传递参数2和4
		suan((a, b) -> a * b, 2, 4); // 8
		// 实现Shi，让他能够计算两数相减的结果，并传递参数6和3
		suan((a, b) -> a - b, 6, 3); // 3
		
		// 定义一个式子add，作用是将两数相加
		// 和一个式子divide，作用是将两数相除
		Shi add = (a, b) -> a + b, divide = (a, b) -> a / b;
		// 方便使用add方法传入6和7，以及使用divide方法传入6和3
		suan(add, 6, 7); // 13
		suan(divide, 6, 3); // 2
		
		// 或者你也可以这样写
		System.out.println(add.func(6, 7)); // 13
		
		// 这个是什么？请往下看！
		My.printInt.print(add.func(2, 3)); // 5
		You.printInt.print(divide.func(8, 2)); // ***4***
		
		My.printDouble.print(3.14); // 3.14
		You.printDouble.print(3.1415926); // ***3.1415926***
		
		My.print.print("asd"); // asd
		You.print.print("gff"); // ***gff***
		
		my.print("abs"); // abs
		you.print(3.14); // ***3.14***
		
	}
	
	interface PrintInt {
		void print(int a);
	}
	
	interface PrintDouble {
		void print(double a);
	}
	
	interface Print {
		void print(Object a);
	}
	
	private static Print my = a -> System.out.println(a);
	private static Print you = a -> System.out.println("***" + a + "***");
	
	static class My {
		
		private static Print print = a -> System.out.println(a);
		private static PrintInt printInt = a -> System.out.println(a);
		private static PrintDouble printDouble = a -> System.out.println(a);
		
	}
	
	static class You {
		
		private static Print print = a -> System.out.println("***" + a + "***");
		private static PrintInt printInt = a -> System.out.println("***" + a + "***");		
		private static PrintDouble printDouble = a -> System.out.println("***" + a + "***");
	}
	
	
}