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Copy pathFeature.java
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55 lines (41 loc) · 1.77 KB
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package basic.lambda;
public class Feature {
// 可选类型声明 - 无需声明参数的类型。编译器可以从该参数的值推断。
// 可选圆括号参数 - 无需在括号中声明参数。对于多个参数，括号是必需的。
// 可选大括号 - 表达式主体没有必要使用大括号，如果主体中含有一个单独的语句。
// 可选return关键字 - 编译器会自动返回值，如果主体有一个表达式返回的值。花括号是必需的，以表明表达式返回一个值。
public static void main(String[] args) {
Feature ft = new Feature();
// with type declaration
MathOperation addition = (int a, int b) -> a + b;
// with out type declaration
MathOperation subtraction = (a, b) -> a - b;
// with return statement along with curly braces
MathOperation multiplication = (int a, int b) -> {
return a * b;
};
// without return statement and without curly braces
MathOperation division = (int a, int b) -> a / b;
System.out.println("10 + 5 = " + ft.operate(10, 5, addition));
System.out.println("10 - 5 = " + ft.operate(10, 5, subtraction));
System.out.println("10 x 5 = " + ft.operate(10, 5, multiplication));
System.out.println("10 / 5 = " + ft.operate(10, 5, division));
// with parenthesis
GreetingService greetService1 = message -> System.out.println("Hello "
+ message);
// without parenthesis
GreetingService greetService2 = (message) -> System.out
.println("Hello " + message);
greetService1.sayMessage("Mahesh");
greetService2.sayMessage("Suresh");
}
interface MathOperation {
int operation(int a, int b);
}
interface GreetingService {
void sayMessage(String message);
}
private int operate(int a, int b, MathOperation mathOperation) {
return mathOperation.operation(a, b);
}
}