如何在多維數組中找到最大值

Question

我有一個多維數組，其中包含字符串值的行和列包含整數值。我想找到這在列這種情況下，最大比分的最大值

這裏是我到目前爲止的代碼（JAVA）

public class HighScore { 
    int row; 
    int col; 
    Scanner input = new Scanner(System.in); 
    public void maxscore() { 
     System.out.println("How many students are you entering scores for"); 
     int st_num = input.nextInt(); 
     String[][] arr = new String[st_num][1]; 
     for (row = 0; row < arr.length; row++) { 
      System.out.println("Please enter the student's name"); 
      String name = input.next(); 
      for (col = 0; col < arr[row].length; col++) { 
       System.out.println("Please enter the students's score"); 
       int score = input.nextInt(); 
      } 
     } 
     System.out.println("Highest score entered was"); 
    } 
    public static void main(String[] args) { 
     HighScore obj = new HighScore(); 
     obj.maxscore(); 
    } 
} 

所以，嗯如果u有任何建議或答案，請幫助

Answer 1

你必須像這樣改變你的代碼，我會在底部添加一個方法，以便你可以對它進行排序。我將添加想着SYSOUT太：

import java.util.Arrays; 
import java.util.Comparator; 
import java.util.Scanner; 

public class HighScore { 

    int row; 

    int col; 

    Scanner input = new Scanner(System.in); 

    public void maxscore() { 
     System.out.println("How many students are you entering scores for"); 
     int st_num = input.nextInt(); 
     String[][] arr = new String[st_num][2]; //you need two columns for Student names AND score 
     for (row = 0; row < arr.length; row++) { 
      System.out.println("Please enter the student's name"); 
      arr[row][0] = input.next(); //puts the student name into the first column in every row you have 

      System.out.println("Please enter the students's score"); 
      arr[row][1] = Integer.toString(input.nextInt()); //puts the score into the second column of the row and you need to cast the int to a string 
     } 
     System.out.println("All scores listed. Highest value at the top: "); 

     arr = sortByScore(arr); //sorts the array with created sort method 

     for(String[] s : arr) { //goes through the array after its sorted and prints it out 
      System.out.println("Students name: " + s[0]); 
      System.out.println("Students score: " + s[1]); 
     } 

     String[][] topScore = new String[1][2]; //will just have the top score 

     for(int i = 0; i < topScore.length; i++) { //just goes through one time anyways and then puts the top score onto the topScore array 
      topScore[i][0] = arr[0][0]; //the first value is the highest so it takes 0 index 
      topScore[i][1] = arr[0][1]; 
     } 



     System.out.println("\nHighest score: "); 

     for(String[] s : topScore) { //puts out highest score 
      System.out.println("Best students name: " + s[0]); 
      System.out.println("Best students score: " + s[1]); 
     } 
    } 
    public static void main(String[] args) { 
     HighScore obj = new HighScore(); 
     obj.maxscore(); 
    } 

    private String[][] sortByScore(String[][] in) { 
     String[][] out = Arrays.stream(in) //this uses java 8 streams and takes the in[][] which is in your case the array "arr" 
      .sorted(Comparator.comparing(x -> -Integer.parseInt(x[1]))) //sorts it 
      .toArray(String[][]::new); //puts it onto the out array 

      return out; //and returns the out array back 
    } 
} 

我希望我幫你！

例控制檯日誌：

How many students are you entering scores for 
5 
Please enter the student's name 
Jay 
Please enter the students's score 
10 
Please enter the student's name 
Peet 
Please enter the students's score 
102 
Please enter the student's name 
John 
Please enter the students's score 
52 
Please enter the student's name 
Zack 
Please enter the students's score 
1 
Please enter the student's name 
Fen 
Please enter the students's score 
95 
All scores listed. Highest value at the top: 
Students name: Peet 
Students score: 102 
Students name: Fen 
Students score: 95 
Students name: John 
Students score: 52 
Students name: Jay 
Students score: 10 
Students name: Zack 
Students score: 1 

Highest score: 
Best students name: Peet 
Best students score: 102