若干学生,属性有学号,班级号,成绩,若干班级号,属性有班级号,总分
package calss_student;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class mainFunc {
List<Student> list = new ArrayList<Student>();
//初始化学生
public void creat_student() {
list.add(new Student("張三", 80, 1501, 151));// 姓名,学号,班级号
list.add(new Student("李四", 87, 1502, 154));
list.add(new Student("比比", 76, 1503, 151));
list.add(new Student("跟女", 88, 1504, 154));
list.add(new Student("热风", 90, 1506, 153));
}
public static void main(String[] args) {
mainFunc mainfunc = new mainFunc();
mainfunc.creat_student();
//mainfunc.creat_classroom();
Map<Integer, Class_room> map = new HashMap<Integer, Class_room>();
for (int i = 0; i < (mainfunc.list).size(); i++) {
if (!map.containsKey(mainfunc.list.get(i).getCno())) {// 不含有
Class_room c = new Class_room(mainfunc.list.get(i).getCno());
map.put(mainfunc.list.get(i).getCno(), c);
c.list.add(mainfunc.list.get(i));
c.setScroe_sum(mainfunc.list.get(i).getScreo());
} else {// 含有这个班级那么把
Class_room c = map.get(mainfunc.list.get(i).getCno());
c.list.add(mainfunc.list.get(i));
c.setScroe_sum(mainfunc.list.get(i).getScreo());
}
}
Set<Integer> set = map.keySet();
Iterator<Integer> iter = set.iterator();
while (iter.hasNext()) {
Integer Cno = iter.next();
Class_room cc = map.get(Cno);
System.out.println("班级号:" + cc.getCno() + " 总分:"
+ cc.getScroe_sum());
}
}
}
学生类
package calss_student;
public class Student {
private String stu_name;
private int screo;
private int sno;
private int cno;
public Student(String stu_name, int screo, int sno, int cno) {
super();
this.stu_name = stu_name;
this.screo = screo;
this.sno = sno;
this.cno = cno;
}
public String getStu_name() {
return stu_name;
}
public void setStu_name(String stu_name) {
this.stu_name = stu_name;
}
public int getScreo() {
return screo;
}
public void setScreo(int screo) {
this.screo = screo;
}
public int getSno() {
return sno;
}
public void setSno(int sno) {
this.sno = sno;
}
public int getCno() {
return cno;
}
public void setCno(int cno) {
this.cno = cno;
}
}
班级类
package calss_student;
import java.util.ArrayList;
import java.util.List;
public class Class_room {
private int cno;
private int scroe_sum;
List<Student> list;
public Class_room(int cno) {
list=new ArrayList<Student>();
this.cno = cno;
}
public int getCno() {
return cno;
}
public void setCno(int cno) {
this.cno = cno;
}
public int getScroe_sum() {
return scroe_sum;
}
public void setScroe_sum(int scroe_sum) {
this.scroe_sum += scroe_sum;
}
}