update:demo10

com/study/demo10/LambdaCollection.java

@@ -0,0 +1,37 @@
+package com.study.demo10;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+class Student {
+    String name;
+    int score;
+
+    Student(String name, int score) {
+        this.name = name;
+        this.score = score;
+    }
+
+    @Override
+    public String toString() {
+        return "Student{name='" + name + "', score=" + score + "}";
+    }
+}
+
+public class LambdaCollection {
+    public static void main(String[] args) {
+        List<Student> students = new ArrayList<>();
+        students.add(new Student("张三", 85));
+        students.add(new Student("李四", 92));
+        students.add(new Student("王五", 78));
+
+        System.out.println("排序前：");
+        students.forEach(s -> System.out.println(s));
+
+        Collections.sort(students, (s1, s2) -> s2.score - s1.score);
+
+        System.out.println("\n排序后（按成绩降序）：");
+        students.forEach(s -> System.out.println(s));
+    }
+}