java初级编程题看图片

发布网友发布时间：2022-04-24 01:26

共1个回答

热心网友时间：2023-10-18 10:39

package know;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
/**
* 学校有很多班级，分为3班，4班，5班，6班，7班。每个班级有10个学生。请在控制台输入班级，然后打印出该班级的学生总人数和学生姓名
* @author huoger
*
*/
public class T3 {

public static void main(String[] args) {
  String[] class3=new String[]{"sdfsd","lklk","erw","xcb","ert","oue","hisdf","hgvke","dfsxcv","ter"};
  String[] class4=new String[]{"hj","rte","qwe","cv","fdg","jhk","xcv","ytj","zxcve","nmzn"};
  String[] class5=new String[]{"zxce","cxbgh","hju","hrt","lldh","dsfg","fgd","zvd","erwa","xcwe"};
  String[] class6=new String[]{"hte","afe","efw","zxc","zxcsd","fsef","xhr","hrwa","xch","shg"};
  String[] class7=new String[]{"sdzxcfsd","js","aag","hr","er","rhe","shrxf","cd","cc","ddd"};
  Map<String, String[]> classes=new HashMap<String, String[]>();
  classes.put("3", class3);
  classes.put("4", class4);
  classes.put("5", class5);
  classes.put("6", class6);
  classes.put("7", class7);

  Scanner sc=new Scanner(System.in);
  while(true){
   System.out.println("输入班号：");
   String classno=sc.next();
   String[] c=classes.get(classno);
   if(classno.equals("close")){
    sc.close();
    break;
   }
   if(c==null)
    System.out.println("不存在该班级");
   System.out.println("班级总人数："+c.length);
   System.out.println("学生名单：");
   for(String name: c){
    System.out.println(name);
   }
  }

}
}

package know;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
/**
* 用Map实现）在List中存放100个100以内的随机数。然后在控制台中输出每个数字出现的次数
*
* @author huoger
*
*/
public class T4 {
public static void main(String[] args) {
  // TODO Auto-generated method stub
  List<Integer> list = new ArrayList<Integer>();
  Map<Integer, Integer> map = new HashMap<Integer, Integer>();
  Random r = new Random();
  for (int i = 0; i < 100; i++) {
   int k = r.nextInt(100);
   list.add(k);
   Integer num = map.get(k);
   if (num == null) {
    map.put(k, 1);
   } else {
    map.put(k, num + 1);
   }
  }
  for (Entry<Integer, Integer> entry : map.entrySet()) {
   System.out.println("数字:"+entry.getKey()+","+"出现次数："+entry.getValue());

  }
  System.out.println(map.size());
  System.out.println(list.size());
}
}

package know;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
/**
* 从控制台输入一个话，然后在控制台输出每个字符出现的次数
* @author huoger
*
*/
public class T5 {
public static void main(String[] args) {
  Scanner sc=new Scanner(System.in);
  while(true){
   System.out.println("输入一句话：");
   String dia=sc.next();
   if(dia.equals("close")){
    sc.close();
    break;
   }
   Map<String, Integer> map=new HashMap<String, Integer>();
   for(int i=0;i<dia.length();i++){
    String c=dia.charAt(i)+"";
    Integer num=map.get(c);
    if(num==null){
     map.put(c, 1);
    }else{
     map.put(c, num+1);
    }
   }
   for(Entry<String, Integer> entry:map.entrySet()){
    System.out.println("字符："+entry.getKey()+",出现次数"+entry.getValue());
   }
  }
}
}

热心网友时间：2023-10-18 10:39

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java初级编程题 看图片

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