会python真的可以为所欲为0(回)
356天前
这里还有人吗1(回)
541天前这里还有人吗0(回)
541天前
每天面对着电脑屏幕，敲打键盘。我所面对的并不只是代码，而是一种生活方式。0(回)
766天前到处都是羊，不想上班0(回)
846天前
鸽子
0(回)
850天前import java.util.*; |
import java.text.DateFormat; |
import java.text.ParseException; |
import java.text.SimpleDateFormat; |
public class Main { |
public static void main(String[] args) throws ParseException |
{ |
Scanner scan = new Scanner(System.in); |
int num = scan.nextInt(); |
HashMap<Integer,Student> hmap = new HashMap<Integer,Student>();//hashmap自动按key值排序 |
for(int i = 0; i < num; i++ ) |
{ |
int no = scan.nextInt(); |
String name = scan.next(); |
int score = scan.nextInt(); |
Student s = new Student(no,name,score); |
hmap.put(no,s); |
} |
num = scan.nextInt(); |
for(int i = 0; i < num; i++ ) |
{ |
String operate = scan.next(); |
if(operate.equals("add"))//要用equals，不能用== |
{ |
int no = scan.nextInt(); |
String name = scan.next(); |
int score = scan.nextInt(); |
Student s = new Student(no,name,score); |
hmap.put(no,s); |
} |
else if(operate.equals("delete")) |
{ |
int no = scan.nextInt(); |
hmap.remove(no); |
} |
else if(operate.equals("set")) |
{ |
int no = scan.nextInt(); |
int score = scan.nextInt(); |
hmap.get(no).setscore(score); |
} |
} |
Iterator iter = hmap.entrySet().iterator(); |
while (iter.hasNext()) |
{ |
Map.Entry entry = (Map.Entry) iter.next(); |
Object value = entry.getValue(); |
System.out.println(value); |
} |
} |
} |
class Student |
{ |
private int no; |
private String name; |
private int score; |
public int getno() |
{ |
return no; |
} |
public void setscore(int a) |
{ |
score = a; |
} |
public Student(int a, String b, int c) |
{ |
no = a; |
name = b; |
score = c; |
} |
public String toString() |
{ |
return "no:"+no+" name:"+name+" score:"+score; |
} |
} |
