按年齡打印陣列

Question

製作一個獲取用戶輸入並將其存儲在數組中的程序。您將存儲至少3個人的信息。將需要存儲關於每個人的三條信息：姓名，年齡和性別（年齡必須是整數）。用戶輸入關於每個人的信息後，您將打印所有的信息，如顯示在下面的人

Melissa, 28, F 
Adam, 11, M 
Landon, 6, M 
Sadie, 1, F 

名單如何訂購通過他們年齡的人，當我有串，並在同一詮釋時間？這裏是我的代碼：

public static void main(String[] args) { 

    Scanner inputString = new Scanner(System.in); 
    Scanner input = new Scanner(System.in); 

    System.out.println("Enter your age:"); 
    int age1 = input.nextInt(); 
    System.out.println("Enter your name:"); 
    String name1 = inputString.nextLine(); 
    System.out.println("Enter your gender:"); 
    String gender1 = inputString.nextLine(); 

    System.out.println("Enter your age:"); 
    int age2 = input.nextInt(); 
    System.out.println("Enter your name:"); 
    String name2 = inputString.nextLine(); 
    System.out.println("Enter your gender:"); 
    String gender2 = inputString.nextLine(); 

    System.out.println("Enter your age:"); 
    int age3 = input.nextInt(); 
    System.out.println("Enter your name:"); 
    String name3 = inputString.nextLine(); 
    System.out.println("Enter your gender:"); 
    String gender3 = inputString.nextLine(); 

    int[] age = new int[3]; 
    age[0] = age1; 
    age[1] = age2; 
    age[2] = age3; 

    String[] name = new String[3]; 
    name[0] = name1; 
    name[1] = name2; 
    name[2] = name3; 

    String[] gender = new String[3]; 
    gender[0] = gender1; 
    gender[1] = gender2; 
    gender[2] = gender3; 

    System.out.print("List of People"); 
    System.out.print("\n" + (age[0]) + ", " + (name[0]) + ", " + (gender[0])); 
    System.out.print("\n" + (age[1]) +", " + (name[1]) +", "+ (gender[1])); 
    System.out.print("\n" + (age[2]) + ", " + (name[2]) +" , "+ (gender[2])); 
} 

Answer 1

如果你想學習Java，請嘗試先學習面向對象的概念。

在特定情況下，你應該使用Person類，單List<Person>和Person實例的Comparator排序列表，而不是試圖三種不同的數組進行排序。看看下面的例子。

package test; 

import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.Collections; 
import java.util.List; 
import java.util.Scanner; 
import test.Person.Gender; 

public class Runner { 

    public static void main(final String[] args) { 
     Scanner input = new Scanner(System.in); 
     Boolean createNewPerson = true; 
     // a single list of person instances 
     List<Person> people = new ArrayList<Person>(); 
     while (createNewPerson) { 
      Person person = new Person(); 
      System.out.println("Enter age:"); 
      person.setAge(Integer.valueOf(input.nextLine())); 
      System.out.println("Enter name:"); 
      person.setName(input.nextLine()); 
      System.out.println("Enter gender:"); 
      person.setGender(Gender.valueOf(input.nextLine().toUpperCase())); 
      // add the person to the list 
      people.add(person); 
      System.out.println("Add another person ? (true/false)"); 
      createNewPerson = Boolean.valueOf(input.nextLine()); 
     } 
     input.close(); 
     // here is the sorting trick 
     Collections.sort(people, new AgeComparator()); 
     // print it out 
     System.out.println(Arrays.toString(people.toArray())); 
    } 
} 

你Person類：

package test; 

public class Person { 
    private String name; 
    private Gender gender; 
    private Integer age; 

    public Integer getAge() { 
     return this.age; 
    } 

    public void setAge(final Integer age) { 
     this.age = age; 
    } 

    public String getName() { 
     return this.name; 
    } 

    public void setName(final String name) { 
     this.name = name; 
    } 

    public Gender getGender() { 
     return this.gender; 
    } 

    public void setGender(final Gender gender) { 
     this.gender = gender; 
    } 

    @Override 
    public String toString() { 
     return this.name + " is a " + this.gender + " and is " + this.age + " year(s) old." + System.lineSeparator(); 
    } 

    enum Gender { 
     MALE, 
     FEMALE; 
    } 

} 

而且你Comparator（在這裏我寫了一個按年齡進行比較，但它只是一個包含main()方法

首先，你的亞軍類一個例子）：

封裝測試;

import java.util.Comparator; 

public class AgeComparator implements Comparator<Person> { 

    @Override 
    public int compare(final Person person1, final Person person2) { 
     return person1.getAge().compareTo(person2.getAge()); 
    } 

} 

換句話說，編程不是寫行，而是關於概念，設計，使用概念，然後寫代碼行。