Question

import javax.swing.JOptionPane;

public class RandomIntegers {

    public static void main( String args[] ) {
        int value;
        String output = "";
        // loop 20 times
        for ( int counter = 1; counter <= 20; counter++ ) {
            // pick random integer between 1 and 6    
            value = 1 + ( int ) ( Math.random() * 6 );
            output += value + "  ";  // append value to output
            // if counter divisible by 5, append newline to String output
            if ( counter % 5 == 0 )
                output += "\n";
        }
        JOptionPane.showMessageDialog( null, output, "20 Random Numbers from 1 to 6",JOptionPane.INFORMATION_MESSAGE );
        System.exit( 0 );
    }
}

我想要做的就是获得总和。例如： 5 4 3 2 1 = 15就像这样。

Answer 1

只需将变量sum初始化为0，然后将value添加到其中：

import javax.swing.JOptionPane;

public class RandomIntegers {

    public static void main( String args[] ) {
        int value;
        String output = "";
        int sum = 0; 
        // loop 20 times
        for ( int counter = 1; counter <= 20; counter++ ) {
            // pick random integer between 1 and 6
            value = 1 + ( int ) ( Math.random() * 6 );
            sum += value;            // Simply add value to sum
            output += value + "  ";  // append value to output
            // if counter divisible by 5, append newline to String output
            if ( counter % 5 == 0 )
                output += "\n";
        }
        JOptionPane.showMessageDialog( null, output, "20 Random Numbers from 1 to 6",JOptionPane.INFORMATION_MESSAGE );
        JOptionPane.showMessageDialog( null, sum, "Total:",JOptionPane.INFORMATION_MESSAGE );
        System.exit( 0 );
    }
}

Answer 2

真的不清楚你要做什么，或者你的问题在这里。如果我能猜到，那就是这行代码：

value = 1 + ( int ) ( Math.random() * 6 );

您是否只想在此处获取随机整数？你可以用不同的方式做到这一点：

Random rand;
int randomNum = rand.nextInt((max - min) + 1) + min;

您可以在此处查看更详细的说明：How do I generate random integers within a specific range in Java?

我怎样才能添加这个随机整数？

2 个答案: