Java 获取错误：无法从静态上下文引用非静态方法getTotalPlayers（）

我看不出我做错了什么，也看不出这里的任何东西是静态的，没有这样声明。我只需要在这里指出正确的方向

测试代码：

public class PaintballPlayerTest
{
//Test program for PaintballPlayer assignment

public static void main (String [] args)
{
//Part 1 check constructor & toString --(make sure ID is working too)
PaintballPlayer sheldon = new PaintballPlayer ("Sheldon", "Lee", "Cooper");
PaintballPlayer leonard = new PaintballPlayer ("Leonard", "Hofstadter");
PaintballPlayer amy = new PaintballPlayer ("Amy", "Farrah", "Fowler");

System.out.println(sheldon);
System.out.println(leonard);

//Part 2 test getTotalPlayer --should be 3
System.out.println("The team has this many players " + PaintballPlayer.getTotalPlayers());

我的代码：

import java.util.*;

public class PaintballPlayer
{
private String firstName, middleName, lastName;
private String secFirst, secLast;
private int id;
private int count;
private static int totalPlayers;
private int playerID;
private int players;

public PaintballPlayer(String first, String middle, String last)
{
    count = 0;
    id = totalPlayers++;
    players = count++;
    firstName = first;
    middleName = middle;
    lastName = last;
}

public PaintballPlayer(String f, String l)
{
    this (f,"",l);
    id = count++;


}


 public PaintballPlayer() 
{
totalPlayers++;
 }

 public static int getTotalPlayers() 
{
return totalPlayers;
}

public String toString()
{
    String name;
    String n;
    name = firstName + " " + middleName + " " + lastName;

    return name;

}


public int getPlayerID()
{
    playerID = count;
    return playerID;
}
  }

同样，我的问题是getTotalPlayers（）方法

编辑：这是应用提供的修复程序编辑的代码。谢谢大家!

getTotalPlayers（）

不是一个静态方法，因此需要一个

PaintballPlayer

的实例来调用此方法

如果要在

PaintballPlayer

中存储玩家总数，则需要一个静态属性（所有实例的引用相同）：

getTotalPlayers（）

不是一个静态方法，因此需要使用

PaintballPlayer

的实例来调用此方法

如果要在

PaintballPlayer

中存储玩家总数，则需要一个静态属性（所有实例的引用相同）：

---

在您的代码中，构造函数#1存在一些问题

变量player和count将被重置，而变量count将增加两倍

在构造函数2中，问题最严重：

public PaintballPlayer(String f, String l)
{
    this (f,"",l);
    id = count++;
    players = count++;
}

因为除了原始构造函数中的2倍之外，还要将count的值增加2倍，所以总共增加了4倍

一旦你完成了德文·弗里斯所说的，你就必须修改PaintballPlayer的构造器

public PaintballPlayer(String first, String middle, String last)
{
    id = totalPlayers++;
    firstName = first;
    middleName = middle;
    lastName = last;
}

---

在您的代码中，构造函数#1存在一些问题

变量player和count将被重置，而变量count将增加两倍

在构造函数2中，问题最严重：

public PaintballPlayer(String f, String l)
{
    this (f,"",l);
    id = count++;
    players = count++;
}

因为除了原始构造函数中的2倍之外，还要将count的值增加2倍，所以总共增加了4倍

一旦你完成了德文·弗里斯所说的，你就必须修改PaintballPlayer的构造器

public PaintballPlayer(String first, String middle, String last)
{
    id = totalPlayers++;
    firstName = first;
    middleName = middle;
    lastName = last;
}

试试这个

import java.util.*;

public class PaintballPlayer {

    private String firstName, middleName, lastName;
    private String secFirst, secLast;
    private int id;
    private static int count;
    private static int totalPlayers;
    private int playerID;
    private static int players;

    public PaintballPlayer(String first, String middle, String last) {
        count++;
        id = count;
        players = count;
        firstName = first;
        middleName = middle;
        lastName = last;
    }

    public PaintballPlayer(String f, String l) {
        this(f, "", l);
        id = count;
        players = count;
    }

    public String toString() {
        String name = firstName + " " + middleName + " " + lastName;
        return name;
    }

    public static int getTotalPlayers() {
        totalPlayers = players;
        return totalPlayers;
    }

    public int getPlayerID() {
        playerID = count;
        return playerID;
    }
}

class PaintballPlayerTest {
//Test program for PaintballPlayer assignment

    public static void main(String[] args) {
//Part 1 check constructor & toString --(make sure ID is working too)
        PaintballPlayer sheldon = new PaintballPlayer("Sheldon", "Lee", "Cooper");
        PaintballPlayer leonard = new PaintballPlayer("Leonard", "Hofstadter");
        PaintballPlayer amy = new PaintballPlayer("Amy", "Farrah", "Fowler");

        System.out.println(sheldon);
        System.out.println(leonard);

//Part 2 test getTotalPlayer --should be 3
        System.out.println("The team has this many players " + PaintballPlayer.getTotalPlayers());
    }
}

试试这个

import java.util.*;

public class PaintballPlayer {

    private String firstName, middleName, lastName;
    private String secFirst, secLast;
    private int id;
    private static int count;
    private static int totalPlayers;
    private int playerID;
    private static int players;

    public PaintballPlayer(String first, String middle, String last) {
        count++;
        id = count;
        players = count;
        firstName = first;
        middleName = middle;
        lastName = last;
    }

    public PaintballPlayer(String f, String l) {
        this(f, "", l);
        id = count;
        players = count;
    }

    public String toString() {
        String name = firstName + " " + middleName + " " + lastName;
        return name;
    }

    public static int getTotalPlayers() {
        totalPlayers = players;
        return totalPlayers;
    }

    public int getPlayerID() {
        playerID = count;
        return playerID;
    }
}

class PaintballPlayerTest {
//Test program for PaintballPlayer assignment

    public static void main(String[] args) {
//Part 1 check constructor & toString --(make sure ID is working too)
        PaintballPlayer sheldon = new PaintballPlayer("Sheldon", "Lee", "Cooper");
        PaintballPlayer leonard = new PaintballPlayer("Leonard", "Hofstadter");
        PaintballPlayer amy = new PaintballPlayer("Amy", "Farrah", "Fowler");

        System.out.println(sheldon);
        System.out.println(leonard);

//Part 2 test getTotalPlayer --should be 3
        System.out.println("The team has this many players " + PaintballPlayer.getTotalPlayers());
    }
}

---

---

好的，太好了！这很有效。但是我知道有0名球员，总共应该有3名。现在playerID运行时是2，现在是4。嗯。看你帖子上的评论。你把

totalPlayers

属性改为

static

？我改了。通过删除“playerID”变量，我修复了playerID部分。我正在试图弄清楚为什么它仍然返回0名玩家。@GnomezGrave:我应用了你的建议，将我的ID降回0，而不是保留在2。我的球员总数仍然是0。谢谢你的帮助，太好了！这很有效。但是我知道有0名球员，总共应该有3名。现在playerID运行时是2，现在是4。嗯。看你帖子上的评论。你把

totalPlayers

属性改为

static

？我改了。通过删除“playerID”变量，我修复了playerID部分。我正在试图弄清楚为什么它仍然返回0名玩家。@GnomezGrave:我应用了你的建议，将我的ID降回0，而不是保留在2。我的球员总数仍然是0。感谢您的帮助。代码中存在语义问题。为什么要在构造函数上设置

count=0

。和

id=count++和
玩家=count++，这些将从2开始递增计数。我建议您使用
count++然后
id=count
玩家=计数且不使<代码>计数=0代码中存在语义问题。为什么要在构造函数上设置
count=0
。和
id=count++和
玩家=count++，这些将从2开始递增计数。我建议您使用
count++然后
id=count
玩家=计数且不使<代码>计数=0修改后我总共有4个玩家，玩家id现在是2。所以playerID=good和totalPlayers现在只需要3岁。我已经编辑了这篇文章。看起来还没有被修改。我还在使用旧代码，几分钟后我会查看帖子。现在可以了。应用此修复程序时，我必须更改一点。谢谢修改后我总共有4个玩家，玩家id现在是2。所以playerID=good和totalPlayers现在只需要3岁。我已经编辑了这篇文章。看起来还没有被修改。我还在使用旧代码，几分钟后我会查看帖子。现在可以了。应用此修复程序时，我必须更改一点。谢谢很抱歉将此作为新答案发布。但是由于询问者感到困惑，我已经发布了这个。谢谢。你们都帮了我大忙。我很感激。很抱歉将此作为新答案发布。但是由于询问者感到困惑，我已经发布了这个。谢谢。你们都帮了我大忙。我很感激。