Java按降序排序位置的名称

Question

从用户获取名称和位置值的程序

存储在字符串数组中

根据位置以降序显示名称价值

public class Samp
{
  public static void main(String[] args)
  {
    Scanner sc=new Scanner(System.in);
    String name[]=new String[5];
    System.out.println("enter the name");
    for(int i=0;i<name.length;i++)
    {
      name[i]=sc.nextLine();
    }
    String location[]=new String[5];
    System.out.println("enter the  location");
    for(int i=0;i<location.length;i++)
    {
      location[i]=sc.nextLine();
    }
    //want to sort name with respect to location in descending order
    System.out.println("Name and location:");
    System.out.println(name[0]+" "+location[0]);
    System.out.println(name[1]+" "+location[1]);
    System.out.println(name[2]+" "+location[2]);
    System.out.println(name[3]+" "+location[3]);
    System.out.println(name[4]+" "+location[4]);
  }
}

Answer 1

用户Arrays.Sort();

 public class Test{

     public static void main(String[] args) {
         Scanner sc=new Scanner(System.in);
         String name[]=new String[5];
         System.out.println("enter the name");
         for(int i=0;i<name.length;i++)
         {
         name[i]=sc.nextLine();  
         }
         String location[]=new String[5];
         System.out.println("enter the  location");
         for(int i=0;i<location.length;i++)
         {
         location[i]=sc.nextLine();  
         }
         Arrays.sort(location); // asc
         Arrays.sort(location,Collections.reverseOrder()); //desc
         System.out.println("Name and location:");
         System.out.println(name[0]+" "+location[0]);
         System.out.println(name[1]+" "+location[1]);
         System.out.println(name[2]+" "+location[2]);
         System.out.println(name[3]+" "+location[3]);
         System.out.println(name[4]+" "+location[4]);
     }
}

使用比较器对象排序：

class Book {
    String name;
    String author;
    public Book(String name, String author) {
        this.name = name;
        this.author = author;
    }
    public static int compareBooks(Book a , Book b)
    {
        return a.name.compareTo(b.name);
    }
    @Override
    public String toString() {
        return "name : " + name + "t" + "author : " + author;
    }
}

public static void main(String[] args) {
    Book[] books = {
            new Book("Book 3" , "Author 1"),
            new Book("Book 2" , "Author 2"),
            new Book("Book 1" , "Author 3"),
            new Book("Book 4" , "Author 4")
    };
    Arrays.sort(books , Book::compareBooks);
    Arrays.asList(books).forEach(System.out::println);
}

Answer 2

public class Test{
     public static void main(String[] args) {
         Scanner sc=new Scanner(System.in);
         String name[]=new String[5];
     String location[]=new String[5];
     for(int i=0;i<name.length;i++)
         {
         System.out.println("enter the name");
         name[i]=sc.nextLine();  
         System.out.println("enter the  location");
         location[i]=sc.nextLine();  
         }
         Arrays.sort(location,Collections.reverseOrder()); //desc
         System.out.println("Name and location:");
         System.out.println(name[0]+" "+location[0]);
         System.out.println(name[1]+" "+location[1]);
         System.out.println(name[2]+" "+location[2]);
         System.out.println(name[3]+" "+location[3]);
         System.out.println(name[4]+" "+location[4]);
     }
}