代碼：import java.util.*;/*TicTac Game__X_|__O_|__X___O_|__X_|__O_ X | O | X*/public class TicTac{ public static void main(String[] args) { Welcome.greet(); Game start = new Game(); start.inputName(); Welcome.greetPlayer(); start.show(); }}class Welcome{ public static void greet(){ System.out.println("\tTicTac Game By Abhi:"); System.out.println("\t __X_|__O_|__X_"); System.out.println("\t __O_|__X_|__O_"); System.out.println("\t X | O | X"); } public static void greetPlayer(){ Game call = new Game(); System.out.println("Welcome " + " " + call.x + " and " + call.y + "\n" + "Have Fun!"); }}class Game{ public String x,y; public void inputName(){ Scanner input = new Scanner(System.in); System.out.println("Enter your name Player 1:"); String Player1 = input.nextLine(); System.out.println("Enter your name Player 2:"); String Player2 = input.nextLine(); x = Player1; y = Player2; } public void show(){ System.out.println("Hi " + " " + x + " and " + y); }}當(dāng)我嘗試調(diào)用Welcome.greetPlayer（）時(shí)，它兩次都給出了一個(gè)空值。但是每當(dāng)嘗試調(diào)用start.show時(shí)，它都會(huì)給我x和y的值。我想在歡迎類中訪問(wèn)字符串 x 和 y。
4 回答
慕斯王
TA貢獻(xiàn)1864條經(jīng)驗(yàn) 獲得超2個(gè)贊
問(wèn)題是您正在使用兩個(gè)不同的對(duì)象。第一個(gè)在方法中創(chuàng)建，第二個(gè)在方法中創(chuàng)建。您僅為方法中的對(duì)象初始化播放器名稱。它們永遠(yuǎn)不會(huì)在第二個(gè)對(duì)象中初始化。Gamemain()greetPlayer()main()
我假設(shè)您只想使用一個(gè)對(duì)象。一種解決方案是將對(duì)象傳遞給方法：GameGamegreetPlayer()
public static void main(String[] args) {
Welcome.greet();
Game start = new Game();
start.inputName();
Welcome.greetPlayer(start);
start.show();
}
public static void greetPlayer(Game call){
System.out.println("Welcome " + " " + call.x + " and " + call.y + "\n" + "Have Fun!");
}
另一種選擇是將名稱直接傳遞給方法：greetPlayer()
public static void main(String[] args) {
Welcome.greet();
Game start = new Game();
start.inputName();
Welcome.greetPlayer(start.x, start.y);
start.show();
}
public static void greetPlayer(String player1, String player2){
System.out.println("Welcome " + " " + player1 + " and " + player2 + "\n" + "Have Fun!");
}
鳳凰求蠱
TA貢獻(xiàn)1825條經(jīng)驗(yàn) 獲得超4個(gè)贊
這是因?yàn)樵?code>Game call = new Game();greetPlayer()
你有一個(gè)新的 Game 實(shí)例，所以你失去了輸入的 和。xy
有只小跳蛙
TA貢獻(xiàn)1824條經(jīng)驗(yàn) 獲得超8個(gè)贊
您正在兩個(gè)地方創(chuàng)建 的對(duì)象。Game()
在 main（） 中：
Game start = new Game();
在 ：greetPlayer()
Game call = new Game();
您可以嘗試合并兩個(gè)類，這樣您就可以在一個(gè)類中引入玩家，獲取名稱和游戲的其余部分：
import java.util.Scanner;
public class TicTac {
public static void main(String[] args) {
Game start = new Game();
Game.greet();
start.inputName();
start.show();
}
}
class Game {
public String x, y;
public void inputName() {
Scanner input = new Scanner(System.in);
System.out.println("Enter your name Player 1:");
String player1 = input.nextLine();
System.out.println("Enter your name Player 2:");
String player2 = input.nextLine();
x = player1;
y = player2;
}
public static void greet() {
System.out.println("\tTicTac Game By Abhi:");
System.out.println("\t __X_|__O_|__X_");
System.out.println("\t __O_|__X_|__O_");
System.out.println("\t X | O | X");
}
public void show() {
System.out.printf("Hi %s and %s", x, y);
}
}
SMILET
TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超4個(gè)贊
您需要將 Game 類的實(shí)例作為參數(shù)傳遞到對(duì) greetPlayer 函數(shù)的調(diào)用中。試試下面這樣：start
import java.util.*;
public class TicTac{
public static void main(String[] args) {
Welcome.greet();
Game start = new Game();
start.inputName();
Welcome.greetPlayer(start);
start.show();
}
)
class Welcome{
public static void greetPlayer(Game call){
System.out.println("Welcome " + " " + call.x + " and " + call.y + "\n" + "Have Fun!");
}
}
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