Eclipse Java 編譯器錯誤

Question

以下錯誤消息是什么意思？

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
Syntax error on token "void", @ expected
Syntax error on token "]", :: expected after this token
Syntax error, insert "enum Identifier" to complete EnumHeader

它不喜歡的行是：

public static void main(String[] args) {

如果您需要查看上下文，我的完整 WIP 代碼如下。 Eclipse 會自動設置在該行中，我以前從未遇到過問題。

public class Card {

    public class cardValue()


    public static int suit;
    public static int faceValue;

    {
        static int getfaceValue()
            {
                return faceValue;
            }

        setfaceValue(String faceValue)
            {
                cardFaceValue = faceValue;
                return faceValue;
            }

         static int getSuit()
            {
                return suit;
            }

         setSuit(int suit)
            {
                cardSuit = suit;
                return suit;
            }
    }


    public static void main(String[] args) {

        cardValue card1 = new cardValue();




        // Suit values into strings for Hearts,Spades,Clubs, Diamonds
        if (cardValue.getSuit() == 1)

            {
            System.out.print(" of Hearts");
            }
        if  (cardValue.getSuit()  == 2)
            {
            System.out.print(" of Spades");
            }
        if  (cardValue.getSuit()  == 3)
            {
            System.out.print(" of Clubs");
            }
        if (cardValue.getSuit()  == 4)
            {
            System.out.print(" of Diamonds");
            }


        System.out.println(card1.getSuit());


    }
}

Answer 1

我真的建議搜索並學習 Java 中的類和對象。

但如果我明白你想要做的事情，這就會奏效：

public class Card {

    private int suit;
    private int faceValue;

    public Card (int suit, int faceValue) {
        setSuit(suit);
        setFaceValue(faceValue);
    }

    int getFaceValue () {
        return faceValue;
    }

    void setFaceValue (int faceValue) {
        this.faceValue = faceValue;
    }

    int getSuit () {
        return suit;
    }

    void setSuit (int suit) {
        this.suit = suit;
    }

    public static void main (String[] args) {
        Card card = new Card(1, 4);

        System.out.print(card.getFaceValue());
        // Suit values into strings for Hearts,Spades,Clubs, Diamonds
        if (card.getSuit() == 1) {
             System.out.println(" of Hearts");
        } else if (card.getSuit() == 2) {
            System.out.println(" of Spades");
        } else if (card.getSuit() == 3) {
            System.out.println(" of Clubs");
        } else if (card.getSuit() == 4) {
            System.out.println(" of Diamonds");
        }
    }
}

Answer 2

如果您在類聲明中有導入，則需要在類聲明之前。

import java.io.*;
import java.util.*;

或類似

檢查您的縮進，這是不正確的。 您的 {} 可能失去平衡。

class Card {

private int suit;
private int faceValue;

public Card (int suit, int faceValue)
{
    setSuit(suit);
    setfaceValue(faceValue);
}

int getfaceValue () {
    return faceValue;
}

void setfaceValue (int faceValue) {
    this.faceValue = faceValue;
}

int getSuit () {
    return suit;
}

void setSuit (int suit) {
    this.suit = suit;
}

public static void main (String[] args) {
    Card card = new Card(1, 4);

    System.out.print(card.getfaceValue());
    // Suit values into strings for Hearts,Spades,Clubs, Diamonds
    if (card.getSuit() == 1) {
         System.out.println(" of Hearts");
    } else if (card.getSuit()  == 2) {
        System.out.println(" of Spades");
    } else if (card.getSuit()  == 3) {
        System.out.println(" of Clubs");
    } else if (card.getSuit()  == 4) {
        System.out.println(" of Diamonds");
    }
}
}