Map score = new hashMap(); score.put("姓名/学号",成绩) ... 至于要排序,直接用数组就行啦 int [] = new int[学生数量]求平均: int all=0; int avg=0; for(int i=0;i<.length;i++){ all += [i]; } avg=all/.length;求最值: .sort()//升序 [0]最小 [.length-1]最大如同楼上所说,set要求不重复的元素,所以用set明显不合理,你也可以用list,反正都差不多
public class Main { private Map<String, Integer> map = new HashMap<String, Integer>(); public static void main(String[] args) { Main m = new Main(); //存储 m.record("name1", 90); m.record("name2", 100); //查询 System.out.println(m.getMark("name2")); //最大值 System.out.println(m.getMaxMark()); //最小值 System.out.println(m.getMinMark()); //平均值 System.out.println(m.getAvgMark());
} private void record(String name, Integer value) { map.put(name, value); } private Integer getMark(String name) { return map.get(name); } private Integer getMaxMark() { return Collections.max(map.values()); } private Integer getMinMark() { return Collections.min(map.values()); } private Integer getAvgMark() { int num = map.values().size(); if (num > 0) { int sum = 0; for (Integer i : map.values()) { sum += i; } return sum / num; } else { return 0; } } }
score.put("姓名/学号",成绩)
...
至于要排序,直接用数组就行啦
int [] = new int[学生数量]求平均:
int all=0;
int avg=0;
for(int i=0;i<.length;i++){
all += [i];
}
avg=all/.length;求最值:
.sort()//升序
[0]最小
[.length-1]最大如同楼上所说,set要求不重复的元素,所以用set明显不合理,你也可以用list,反正都差不多
public class Main {
private Map<String, Integer> map = new HashMap<String, Integer>();
public static void main(String[] args) {
Main m = new Main();
//存储
m.record("name1", 90);
m.record("name2", 100);
//查询
System.out.println(m.getMark("name2"));
//最大值
System.out.println(m.getMaxMark());
//最小值
System.out.println(m.getMinMark());
//平均值
System.out.println(m.getAvgMark());
}
private void record(String name, Integer value) {
map.put(name, value);
}
private Integer getMark(String name) {
return map.get(name);
}
private Integer getMaxMark() {
return Collections.max(map.values());
}
private Integer getMinMark() {
return Collections.min(map.values());
}
private Integer getAvgMark() {
int num = map.values().size();
if (num > 0) {
int sum = 0;
for (Integer i : map.values()) {
sum += i;
}
return sum / num;
} else {
return 0;
}
}
}