HUAWEI華爲Java軟件工程師機試題------集合類

HUAWEI華爲Java軟件工程師機試題——集合類

1、有如下Student對象，屬性如圖所示：

其中classNum表示學生的班級編號，比如：class05
有如下List：
List 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”));
在這個list 的基礎上，完成下列要求：
1） 計算所有學生的平均年齡
2） 計算各個班級的平均分

2、已知有16支足球隊參加2008北京奧運會。寫一個程序，隨機把16支球隊分成四組

3、設計Account對象如下：

要求完善設計，使得該Account 對象能夠自動分配id。
給定一個List 如下：
List list = new ArrayList();
list.add(new Account(10.00, “1234”));
list.add(new Account(15.00, “5678”));
list.add(new Account(0, “1010”));
要求把List 中的內容放到一個Map 中，該Map 的鍵爲id，值爲相應的Account 對象。
最後遍歷這個Map，打印所有Account 對象的id 和餘額。

4、已知某學校課程安排如下：

完成下列要求：
1） 使用一個Map，以老師的名字作爲鍵，以老師教授的課程名作爲值，表示上述
課程安排。
2） 增加了一位新老師Allen 教JDBC
3） Lucy 改爲教CoreJava
4） 遍歷Map，輸出所有的老師及老師教授的課程
5） *利用Map，輸出所有教JSP 的老師。

5、利用Map，完成下面的功能：
從命令行讀入一個字符串，表示一個年份，輸出該年的世界盃冠軍是哪支球隊。如果該
年沒有舉辦世界盃，則輸出：沒有舉辦世界盃。

6、在上題的基礎上繼續完成：輸入球隊的名字，輸出得冠的年份
如：輸入巴西，輸出1958 1962 1970 1994 2002
7、完成下面的要求
1) 創建一個List，在List 中增加三個工人，基本信息如下：
姓名 年齡 工資
zhang3 18 3000
li4 25 3500
wang5 22 3200
2) 在li4 之前插入一個工人，信息爲：姓名：zhao6，年齡：24，工資3300
3) 刪除wang5 的信息
4) 利用for 循環遍歷，打印List 中所有工人的信息

我的答案(HCQ，2018/8/7)

1.

package JulyTwelfthHUAWEI;

public class Student {
    private String name;
    private int age;
    private double score;
    private String classNum;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public double getScore() {
        return score;
    }
    public void setScore(double score) {
        this.score = score;
    }
    public String getClassNum() {
        return classNum;
    }
    public void setClassNum(String classNum) {
        this.classNum = classNum;
    }

    public Student(String name, int age, double score, String classNum) {
        super();
        this.name = name;
        this.age = age;
        this.score = score;
        this.classNum = classNum;
    }
    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }
}

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package JulyTwelfthHUAWEI;

import java.util.List;
import java.util.ArrayList;

public class StudentTest {
    public static void main(String[] args) {
        List<Student> list = new ArrayList<Student>();
        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 sumAge = 0;
        double sumScore4 = 0;
        double sumScore5 = 0;
        double sumScore6 = 0;
        double num4 = 0;
        double num5 = 0;
        double num6 = 0;
        // 1)
        for(Student stu : list) {
            sumAge+=stu.getAge();
        }
        System.out.print("所有學生的平均年齡：");
        System.out.println(sumAge/6.0);
        // 2) 
        for(int i=0; i<list.size(); i++) {
            if(list.get(i).getClassNum().equals("class04")) {
                sumScore4+=list.get(i).getScore();
                num4++;
            }
            if(list.get(i).getClassNum().equals("class05")) {
                sumScore5+=list.get(i).getScore();
                num5++;
            }
            if(list.get(i).getClassNum().equals("class06")) {
                sumScore6+=list.get(i).getScore();
                num6++;
            }
        }
        System.out.print("class04的平均分數：");
        System.out.println(sumScore4/num4);
        System.out.print("class05的平均分數：");
        System.out.println(sumScore5/num5);
        System.out.print("class06的平均分數：");
        System.out.println(sumScore6/num6);
    }
}

2.

package JulyTwelfthHUAWEI;

import java.util.List;

public class Group {
    private int id;
    private String name;
    private List<String> team;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<String> getTeam() {
        return team;
    }
    public void setTeam(List<String> team) {
        this.team = team;
    }
    public Group(int id, String name, List<String> team) {
        super();
        this.id = id;
        this.name = name;
        this.team = team;
    }
    public Group() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Override
    public String toString() {
        return "Group [id=" + id + ", name=" + name + ", team=" + team + "]";
    }   
}
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package JulyTwelfthHUAWEI;

import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

public class Football {
    public static void main(String[] args) {
        List<String> teams = new ArrayList<String>();
        Collections.addAll(teams,"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P");
        Collections.shuffle(teams);
        System.out.println(teams);

        Group[] groups = new Group[4];
        for(int i = 0; i<groups.length; i++) {
            groups[i] = new Group(i, "G"+i, new ArrayList<>());
        }

        int n = 0;
        for(int i = 0;i < teams.size();i++){
            groups[n++ % 4].getTeam().add(teams.get(i));
        }
        for(int i = 0; i<groups.length; i++) {
            System.out.println(groups[i].getName()+groups[i].getTeam());
        }

    }
}

3.

package JulyTwelfthHUAWEI;

import java.util.Random;

public class Account {
    private long id;
    private double balance;
    private String password;
    Random rd = new Random();
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public double getBalance() {
        return balance;
    }
    public void setBalance(double balance) {
        this.balance = balance;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Account(double balance, String password) {
        super();
        this.id = Math.abs(rd.nextLong());
        this.balance = balance;
        this.password = password;
    }
    public Account() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Override
    public String toString() {
        return "Account [id=" + id + ", balance=" + balance + "]";
    }
}
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package JulyTwelfthHUAWEI;

import java.util.ArrayList;

import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class AccountTest {
        public static void main(String[] args) {
            List<Account> list = new ArrayList<Account>();
            list.add(new Account(10.00, "1234"));
            list.add(new Account(15.00, "5678"));
            list.add(new Account(0, "1010"));
            Map<Long, Account> map = new HashMap<>();
            for(Account account : list) {
                map.put(account.getId(), account);
            }

            Collection<Account> c = map.values();
            for (Account a : c) {
                System.out.println(a.toString());
            }
        }
}

4.

package JulyTwelfthHUAWEI;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class Teacher {
    public static void main(String[] args) {
        //   1)
        Map<String, String> map = new HashMap<>();
        map.put("Tom", "CoreJava");//1001=jack
        map.put("John", "Oracle");
        map.put("Susan", "Oracle");
        map.put("Jerry", "JDBC");
        map.put("Kevin", "JSP");
        map.put("Lucy", "JSP");
        //   2)
        map.put("Allen", "JDBC");
        //   3)
        map.replace("Lucy", "CoreJava");
        //   4)
        System.out.println(map);
        //   5)
        Set<Entry<String, String>> set = map.entrySet();
        for(Entry<String, String> entry : set) {
            if(entry.getValue().equals("JSP")) {
                System.out.println(entry.getKey());
            }
        }   
    }
}

5. and 6.

package JulyTwelfthHUAWEI;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;

public class WorldCup {
    private static Scanner sc;

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("2006", "意大利");
        map.put("2002", "巴西");
        map.put("1998", "法國");
        map.put("1994", "巴西");
        map.put("1990", "德國");
        map.put("1986", "阿根廷");
        map.put("1982", "意大利");
        map.put("1978", "阿根廷");
        map.put("1974", "德國");
        map.put("1970", "巴西");
        map.put("1966", "英格蘭");
        map.put("1962", "巴西");
        map.put("1958", "巴西");
        map.put("1954", "德國");
        map.put("1950", "烏拉圭");
        map.put("1938", "意大利");
        map.put("1934", "意大利");
        map.put("1930", "烏拉圭");

        sc = new Scanner(System.in);
        //   5.
        System.out.print("請輸入年份：");
        String year = sc.next();
        if(map.containsKey(year)==true) {
            System.out.print(year+"年的世界盃冠軍是：");
            System.out.println(map.get(year));
        } else {
            System.out.println(year+"年沒有舉辦世界盃。");
        }

        //   6.
        System.out.print("請輸入冠軍球隊的國家：");
        String team = sc.next();
        Set<Entry<String, String>> set = map.entrySet();
        System.out.print(team+"隊獲得世界盃冠軍的年份是：");
        for(Entry<String, String> entry : set) {
            if(entry.getValue().equals(team)) { 
                System.out.print(entry.getKey()+" ");
            }
        }       
    }
}

7.

package JulyTwelfthHUAWEI;

public class Worker {
    private String name;
    private int age;
    private int salary;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public int getSalary() {
        return salary;
    }
    public void setSalary(int salary) {
        this.salary = salary;
    }
    public Worker(String name, int age, int salary) {
        super();
        this.name = name;
        this.age = age;
        this.salary = salary;
    }
    public Worker() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Override
    public String toString() {
        return "Worker [name=" + name + ", age=" + age + ", salary=" + salary + "]";
    }
}
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package JulyTwelfthHUAWEI;

import java.util.ArrayList;
import java.util.List;

public class WorkerTest {
    public static void main(String[] args) {
        //   1)
        List<Worker> list = new ArrayList<Worker>();
        list.add(new Worker("zhang3", 18, 3000));
        list.add(new Worker("li4", 25, 3500));
        list.add(new Worker("wang5", 22, 3200));
        //   2)

        list.add(1, new Worker("zhao6", 24, 3300));
        //   3)
        for(int i=0; i<list.size(); i++) {
            if(list.get(i).getName()=="wang5") {
                list.remove(i);
            }   
        }
        //   4)
        for(int i=0; i<list.size(); i++) {
            System.out.println(list.get(i).toString());
        }       
    }
}

代碼僅供參考，謝謝

2018/8/7