package a927;
import java.util.ArrayList;
import java.util.List;
class Student
{
private String name ;
private int age ;
private int score ;
private String classNum ;
public Student(String name,
int age,
int score , String classNum )
{
this.age=
age ;
this.classNum =
classNum ;
this.name =
name ;
this.score =
score ;
}
public int getAge() {
return age;
}
public void setAge(
int age) {
this.age =
age;
}
public int getScore() {
return score;
}
public void setScore(
int score) {
this.score =
score;
}
public String getClassNum() {
return classNum;
}
public void setClassNum(String classNum) {
this.classNum =
classNum;
}
}
public class A {
public static void main(String[] args)
{
List<Student> list =
new ArrayList<>
() ;
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 sum =
0 ;
for(
int i =
0 ; i<list.size();i++
)
{
sum += list.
get(i).getAge();
}
System.out.println(
"平均年龄为：" + sum/
list.size());
int sum4 =
0 ;
int j4 =
0 ;
int sum5 =
0 ;
int j5 =
0 ;
int sum6 =
0 ;
int j6 =
0 ;
for(Student x : list)
{
if(x.getClassNum().equals(
"class05") )
{
sum5 +=
x.getScore( ) ;
++
j5 ;
}
if(x.getClassNum().equals(
"class04") )
{
sum4 +=
x.getScore( ) ;
++
j4 ;
}
if(x.getClassNum().equals(
"class06") )
{
sum6 +=
x.getScore( ) ;
++
j6 ;
}
}
System.out.println(
"class05的平均成绩："+sum5/
j5);
System.out.println(
"class04的平均成绩："+sum4/
j4);
System.out.println(
"class06的平均成绩："+sum6/
j6);
}
}
转载于:https://www.cnblogs.com/20gg-com/p/5913309.html
