java成绩排序 java成绩从高到低

 

查找和排序

题目：输入任意（用户，成绩）序列，可以获得成绩从高到低或从低到高的排列,相同成绩
都按先录入排列在前的规则处理。

示例：
jack      70
peter     96
Tom       70
smith     67

从高到低  成绩
peter     96
jack      70
Tom       70
smith     67

从低到高

smith     67

jack      70
Tom      70
peter     96

import java.util.Scanner;
 
public class Main{
    private static String[] names;
    private static int[] grades;
    private static void swap(int i, int j) {
        String tempS = names[j];
        int tempG = grades[j];
        names[j] = names[i];
        grades[j] = grades[i];
        names[i] = tempS;
        grades[i] = tempG;
    }
    public static void sort(int flag) {
        if(flag==0){
        for (int i = 1; i < names.length; i++)
            for (int j = i; j > 0 ; j--) {
                if(grades[j]>grades[j-1])
                swap(j, j - 1);
            }
    }else if(flag==1){
           for (int i = 1; i < names.length; i++)
            for (int j = i; j > 0 ; j--) {
                if(grades[j]<grades[j-1])
                swap(j, j - 1);
            }
        }
    }
    public static void main(String[] args) {        // TODO Auto-generated method stub       
        Scanner input = new Scanner(System.in);
        while (input.hasNext()) {
            int n = input.nextInt();
            int flag = input.nextInt();
            names = new String[n];
            grades = new int[n];
            for (int i = 0; i < n; i++) {
                names[i] = input.next();
                grades[i] = input.nextInt();
            }
            sort(flag);
            for (int i = 0; i < n; i++) {
                System.out.println(names[i] + " " + grades[i]);
            }
        }
    }
}

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {             
             //输入人数       
            int numPeople = scanner.nextInt();            
             //排序策略           
            int option = scanner.nextInt();                        
             //输入人员的姓名和成绩             
            List<Student> stuList = new ArrayList<>();
            for (int i = 0; i < numPeople; i++) {
                stuList.add(new Student(scanner.next(), scanner.nextInt()));
            }                          //降序         
            if (option == 0) {
                stuList.sort((o1, o2) -> o2.score - o1.score);
            } else if (option == 1)//升序             
            {
                stuList.sort((o1, o2) -> o1.score - o2.score);
            }
            for (Student student : stuList) {
                System.out.println(student.name + " " + student.score);
            }
        }
    }
}

class Student {
    public String name;
    public int score;

    public Student(String name, int score) {
        this.name = name;
        this.score = score;
    }
}