java - Java 中的输出忽略方法

Question

这个问题已经有答案了:

How do I compare strings in Java? (23 个回答)

已关闭 5 年前。

尝试创建一个代码来打印随机抽取的 5 张牌的面值和花色。由于某种原因，它只打印方法的输入，而不打印方法的结果。有人可以告诉我哪里出错了吗？谢谢!对于结果我得到输出:

3 of 1
2 of 5
2 of 6
0 of 11
3 of 12

import java.util.*;

    public class Card {

    static int suits = 0;
    static int values = 0;
    static String c, d,e,f;
     public String getSuit()                
             {
                if (c == "0")
                    e = ("Hearts");             
                else 
                    if (c == "1")
                    e = "Spades";               
                else
                    if (c == "2")
                    e = "Clubs";                    
                else
                    if (c == "3")
                    e = "Diamonds";
                else
                    e=c;

                return e;
                }

            public String getValue() {

                if (d == "0")
                    f = ("Ace");
                else                    
                if (d =="11")
                    f = ("Jack");
                else 
                if (d == "12")
                    f = ("Queen");
                else
                if (d == "13")
                    f = ("King");
                else
                    f =d;
                return f;
            }

    public static void main(String[] args) {
        // TODO Auto-generated method stub


        Random gen = new Random();

        int [] suits = new int[4];
        {
            for (int index=0;index<suits.length; index++)
            suits[index] = index;
        }   


        int [] values = new int[14];
        {
            for (int j = 0; j<values.length;j++)
                values[j]= j;
        }

        for (int g = 0; g<5; g++)
        {
         int a = gen.nextInt(suits.length);

         int b = gen.nextInt(values.length);

         c = Integer.toString(a);

         d = Integer.toString(b);
         //System.out.println(c);
         //System.out.println(d);

         Card draw = new Card ();

         draw.getSuit();
         draw.getValue();

         System.out.println(e + " of "+f);
        }
    }

Answer 1

static String c, d,e,f;

都是字符串，在Java中你必须使用.equals来比较字符串。因此，

    if (c.equals("0"))
        e = ("Hearts");             
    else 
        if (c.equals"1"))
        e = "Spades";  

并将代码中各处的 == 更改为 .equals 。请告诉我们以获得更多帮助!