在 Java 中打印 Unicode 字符 - PrintWriter

Question

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I am developing a card game in Java and I am currently using a command line to interact and display outputs of the game.<\/i>

public String toSymbol(Suit suit){
    switch(suit){
        case SPADE:
            return "\u2664";
        case DIAMOND:
            return "\u2662";
        case CLUB:
            return "\u2667";
        case HEART:
            return "\u2661";
        default:
            return "null";
    }
}

Answer 1

Glyph

As commented, you should check that your System.out and console are set to UTF-8, and that a font is available containing glyphs for those characters.

You neglected to mention your operating system, but I'll guess it is Microsoft Windows. If so, this Question might help: Java, UTF-8, and Windows console .

We can simplify your code. Java source code supports UTF-8, so you can use the actual suit characters directly rather then use the Unicode code point escapes.

Here are the four French-suited characters, in “black” and in “white”.

System.out.println( "♠️♥️♣️♦️" ) ; 
System.out.println( "♤♡♧♢" ) ; 

See this code run successfully at Ideone.com .

Enum

By the way, you can embed knowledge of the emoji character within your enum. No need to maintain this separate method as shown in your Question.

enum Suit {
    SPADES( "♠️" , "♤" ), HEARTS( "♥️" , "♡" ), CLUBS( "♣️" , "♧" ), DIAMONDS( "♦️" , "♢" );
    private final String emojiBlack, emojiWhite ;
    Suit( String emojiBlack , String emojiWhite ) {  // Constructor.
        this.emojiBlack = emojiBlack ;
        this.emojiWhite= emojiWhite ;
    }
    String emojiBlack() {  // Accessor (getter).
        return this.emojiBlack ;
    }
    String emojiWhite() {  // Accessor (getter).
        return this.emojiWhite ;
    }
}

Usage:

System.out.println(
    Suit.HEARTS.emojiBlack() 
);

♥️