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- 字菁悠心 2021-10-15 18:36关注
楼主大大应该把代码贴出来,这样我就可以复制粘贴了;
代码如下(拷贝到idea上直接使用):import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; /** * @ClassName Test * @DesCription TODO * @Author 584654 * @Date 2021/10/15 18:23 * @Version 1.0 * @PackageName com.hdd.logtest.test **/ public class Test { public static void main(String[] args) { List<Student> list=new ArrayList<Student>(); list.add(new Student("Tom",18,100,"class05")); list.add(new Student("Jerry",22,70,"class04")); list.add(new Student("Owen",25,90,"class05")); list.add(new Student("Jim",30,80,"class05")); list.add(new Student("Steve",28,66,"class06")); list.add(new Student("Kevin",24,100,"class04")); Double aveAge = list.stream().collect(Collectors.averagingInt(Student::getAge)); System.out.println("计算所有学生的平均年龄:"+aveAge); Double aveScore = list.stream().collect(Collectors.averagingDouble(Student::getScore)); System.out.println("计算各个班级的平均分:"+aveScore); } /** * @ClassName Student * @DesCription TODO * @Author 584654 * @Date 2021/10/15 18:14 * @Version 1.0 * @PackageName com.hdd.logtest.test **/ public static class Student { private String name; private Integer age; private double score; private String className; public Student(String name, Integer age, double score, String className) { this.name = name; this.age = age; this.score = score; this.className = className; } public void setName(String name) { this.name = name; } public void setAge(Integer age) { this.age = age; } public void setScore(double score) { this.score = score; } public void setClassName(String className) { this.className = className; } public String getName() { return name; } public Integer getAge() { return age; } public double getScore() { return score; } public String getClassName() { return className; } } }
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