Lambba

55## Lambba标准格式

Lambba表达式的无参数无返回值练习

package Text2;
public interface Cook {
    public abstract void makeFood();
}

Lambba表达式的有参数有返回值练习1

package Text2;
import java.util.Arrays;
import java.util.Comparator;
public class demo8ArraysPerson {
    public static void main(String[] args) {
        Person[] arr={new Person("派大星",8),new Person("章鱼哥",38),new Person("蟹老板",45)};
        /*Arrays.sort(arr, new Comparator<Person>() {
            @Override
            public int compare(Person o1, Person o2) {
                return o1.getAge()-o2.getAge();
            }
        });*/

        Arrays.sort(arr,(Person O1,Person O2)->{
            return O1.getAge()-O2.getAge();
        });
        //遍历数组
        for (Person p : arr) {
            System.out.println(p);
        }
    }
}

package Text2;
public class Person {
    private String name;
    private int age;

    public Person() {
    }
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

Lambba表达式的有参数有返回值练习2

package Text2;
public class demo8Calculator {
    public static void main(String[] args) {
      invokeCalc(10, 20, new Calculator() {
          @Override
          public int calc(int a, int b) {
              return a+b;
          }
      });
      invokeCalc(120,130,(int a,int b)->{
      return a+b;
      });

    }
    public static void invokeCalc(int a,int b,Calculator c){
        int sum=c.calc(a,b);
        System.out.println(sum);
    }
}

package Text2;
public interface Calculator {
    public abstract int calc(int a,int b);
}