在Java小程序的.class错误

问题描述

我写一个小程序，将随机挑选10张卡，并将其显示在屏幕上。不过，我收到一个错误的.c​​lass和;当我试图传递的String []所需的错误。谁能帮助？这是我的code：

I am writing an applet that will randomly pick 10 cards and show them on the screen. However, I am receiving a .class error and a ; needed error when I attempt to pass an String[]. Anyone help? This is my code:

import java.awt.Graphics;
import java.awt.Color;
import java.awt.Image;
import java.applet.Applet;
import java.lang.Math;
import java.util.Random;

public class unit12Assignment extends Applet
{
Image card1 ... card52;

public void init()
{
    card1 = getImage( getDocumentBase(), "c1.gif" );
    ...
    card52 = getImage( getDocumentBase(), "sk.gif" );
}

public void getCards()
{
    String cardNumber;
    double cardRandom;
    int cardRandomNumber;
    String[] cardSelection = new String[10];
    Random ran = new Random();

    for (int number = 0; number <=  9; )
    {
        cardRandom = ran.nextInt(52) + 1;
        cardRandomNumber = (int) Math.round( cardRandom );

        if ( cardRandomNumber > 0 && cardRandomNumber <= 52 )
        {
            cardNumber =  "card" + cardRandomNumber;
            number++;
        }
    }
    paint( String[] cardSelection );
}

public void paint(Graphics g, String[] card)
{
    setBackground( Color.green );
    g.drawImage( card[0], 10, 10, this);
    g.drawImage( card[1], 90, 10, this);
    g.drawImage( card[2], 170, 10, this);
    g.drawImage( card[3], 250, 10, this);
}

}

推荐答案

这行：

paint( String[] cardSelection );

应该是语法

paint( cardSelection );

您只需要一个变量之前写的类型（例如的String [] ）当你第一次声明。从那里它可以只通过其名称被称为

You only need to write the type (for example String[]) before a variable when you first declare it. From there it can just be referred to by its name.

我也注意到，油漆需要图形参数以及一个的String [ ] ，所以你需要通过在还有：

I also notice that paint takes a Graphics argument as well as a String[], so you'll need to pass that in as well:

Graphics g = getGraphicsSomehow();
paint(g, cardSelection);

编辑：查看使用 图形与替代解决方案。

see Andrew Thompson's answer for a disclaimer on using Graphics with an alternative solution.

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