进阶day06-使用Lambda表达式简化有参数有返回值的方法(比较器)

javaSE-day07/src/com/inmind/lambda01/Demo02.java

@@ -0,0 +1,34 @@
+package com.inmind.lambda01;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+
+/*
+学习的内容：使用Lambda表达式简化有参数有返回值的方法(比较器)
+
+使用比较器,对学生对象按成绩降序排序
+ */
+public class Demo02 {
+    public static void main(String[] args) {
+        ArrayList<Student> students = new ArrayList<>();
+        students.add(new Student("张三1", 95));
+        students.add(new Student("张三2", 90));
+        students.add(new Student("张三3", 98));
+
+        /*Collections.sort(students, new Comparator<Student>() {
+            *//*
+            我-它：升序
+            它-我：降序
+             *//*
+            @Override
+            public int compare(Student o1, Student o2) {
+                return o2.score - o1.score;
+            }
+        });*/
+
+        Collections.sort(students,(Student o1, Student o2)->{ return o2.score - o1.score;});
+
+        System.out.println(students);
+    }
+}

javaSE-day07/src/com/inmind/lambda01/Student.java

@@ -0,0 +1,19 @@
+package com.inmind.lambda01;
+
+public class Student {
+    String name;
+    int score;
+
+    public Student(String name, int score) {
+        this.name = name;
+        this.score = score;
+    }
+
+    @Override
+    public String toString() {
+        return "Student{" +
+                "name='" + name + '\'' +
+                ", score=" + score +
+                '}';
+    }
+}