如何将一个对象从一个 case 语句传递到另一个

Question

我正在尝试从案例 "A" 到案例 "G" 获取 "player" 对象，但当然我不能这样做，因为该对象是在案例 A 中创建的我必须把它放在那里。如何在保持相同实例的同时将其向下移动？ java 的初学者。我希望能够通过按 "G"

来编辑数组中的播放器

package hockeyplayer;
import java.util.Scanner;

public class HockeyMain {    
private static String choice;
private static HockeyPlayer[] players = new HockeyPlayer[12];
private static final String MENU = "Hockey Tracker\n"+
        "A-Add Player\n"+
        "G-Add game details\n"+
        "S-Show players\n"+
        "X-Quit\n";

public static void main(String[] args) {

    Scanner input = new Scanner(System.in);

do{    
    System.out.println(MENU);
    choice = input.nextLine();

    switch(choice){
        case "A":
           HockeyPlayer player = new HockeyPlayer();    
           players[player.getPlayerNumber()-1] = player; 
            break;
        case "G":



            break;
        case "S":
            break;
        case "X":    
     }

}while(!choice.equals("X"));   
}      
}

package hockeyplayer;
import java.util.Scanner;

public class HockeyPlayer {
private String[] opponent = new String[10];
private int[] goalsScored = new int[10];
private int[] gameNumber = new int[10];
private String name;
private int playerNumber;    

public HockeyPlayer() {    
    Scanner input = new Scanner(System.in);
    System.out.println("What is the name of the player?");
    name = input.nextLine();
    System.out.println("What is the player's number?");
    playerNumber = input.nextInt();
    input.nextLine();    
}

public String[] getOpponent() {
    return opponent;
}

public void setOpponent(String[] opponent) {
    this.opponent = opponent;
}

public int[] getGoalsScored() {
    return goalsScored;
}

public void setGoalsScored(int[] goalsScored) {
    this.goalsScored = goalsScored;
}

public String getName() {
    return name;
}

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

public int getPlayerNumber() {
    return playerNumber;
}

public void setPlayerNumber(int playerNumber) {
    this.playerNumber = playerNumber;
}

public void addGameDetails(){        
    Scanner input = new Scanner(System.in);
    System.out.println("What game number was it?");
    gameNumber[0] = input.nextInt();
    input.nextLine();
    System.out.println("Who were the opponents?");
    opponent[0] = input.nextLine();
    System.out.println("How many goals did the player score?");
    goalsScored[0] = input.nextInt();        
}    
}

Answer 1

像这样在 switch statement 之外声明一个 HockeyPlayer 实例：

HockeyPlayer player = null;  
do{    
System.out.println(MENU);
choice = input.nextLine();    
switch(choice){
    case "A":
       player = new HockeyPlayer();        
       players[player.getPlayerNumber()-1] = player; 
        break;
    case "G":
       player.addGameDetails(); //invoke the method here for case G
        break;
    case "S":
        break;
    case "X":    
 }

}while(!choice.equals("X"));   
}

想法是 HockeyPlayer 对象应该可以被所有 switch statements 访问，所以你需要在它可以访问的地方声明它。

Answer 2

将 player 变量的声明移到 do-while 之外，仍然在 case "A" 中实例化：

HockeyPlayer player = null;
do {    
  System.out.println(MENU);
  choice = input.nextLine();
  switch(choice){
    case "A":
       player = new HockeyPlayer();    
       players[player.getPlayerNumber()-1] = player; 
        break;
    case "G":
       // you can use player here (assuming 


        break;
    case "S":
        break;
    case "X":    
 }
} while(!choice.equals("X"));

如何将一个对象从一个 case 语句传递到另一个

How to pass an object from one case statement to another

java

arrays

object

instance

switch-statement