java - 将每次运行后的输出更改为所有运行后的一个输出

Question

除了输出之外，我的程序几乎全部完成，我希望它在一个输出中显示所有内容，而不是每次运行后一次，它应该运行 500 次，但在解决这个问题之前只运行了 10 次。

package assignment5;
import javax.swing.JOptionPane;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
import java.text.*;
public class assignment5
{
    public static void main(String[] args)
    {
        lottery pic=new lottery();for(int i = 0; i <10; i++)
        {
            pic.Get_player_numbers();
            pic.Get_jackpot_number();
            pic.Check_winner ();
            pic.Write_data();

        }
    }
}
class lottery
{
    int[] picks= new int[5];
    int[] cpick=new int[5];
    int i;
    int j,c;
    int match=0;
    double matchcount0=0;
    double matchcount1=0;
    double matchcount2=0;
    double matchcount3=0;
    double matchcount4=0;
    double matchcount5=0;
    int jackpot = 25000000;
    int payout;

    void Get_player_numbers ()
    {
        int temp,dupflag=0;
        for(i=0;i<=4;++i)
        {
            //YOU DO NOT NEED THE CNUMBERFLAG
            //IF YOU GENERATED THE NUMBERS CORRECLTY, THE COMPUTER WILL NOT GENERATE ONE ABOVE 99 OR LESS THAN 1
            dupflag=0;
            while(dupflag==0)
            {
                temp = (int)Math.round(Math.random()*99)+1;
                dupflag=1;
                for(c=0;c<=i;++c)
                {
                    if(temp==picks[c])
                    {
                        dupflag=0;
                    }
                }//inner for loop
                if(dupflag==1)  
                    picks[i]=temp;
            }
        }       
    }

    //void jackpot()
    void Get_jackpot_number()
    {
        int ctemp,cdupflag=0;
        for(j=0;j<=4;++j)
        {
            //YOU DO NOT NEED THE CNUMBERFLAG
            //IF YOU GENERATED THE NUMBERS CORRECLTY, THE COMPUTER WILL NOT GENERATE ONE ABOVE 99 OR LESS THAN 1
            cdupflag=0;
            while(cdupflag==0)
            {
                ctemp = (int)Math.round(Math.random()*99)+1;
                cdupflag=1;
                for(c=0;c<=j;++c)
                {
                    if(ctemp==cpick[c])
                    {
                        cdupflag=0;
                    }
                }//inner for loop
                if(cdupflag==1) 
                    cpick[j]=ctemp;
            }
        }
        String Jackpot="Computer Lottery numbers are: "+"\n";
        //String computer = "";
        for(j=0;j<=4;++j)
        {
            if(j==4)
                Jackpot=Jackpot+cpick[j];   
            else
                Jackpot=Jackpot+cpick[j]+"-";
        }
    }

    void Check_winner ()
    {
        match=0;

        for(int i=0;i<=4;++i)
        {
            for(int j=0;j<=4;++j)
            {
                if(picks[i]==cpick[j])
                {
                    match=match+1;
                }
            }
        }
    }
    void Write_data ()
    {

        if(match==0)
        {
            matchcount0=matchcount0+1;

            payout=0;
            jackpot=jackpot+25000;
        }
        else if(match==1)
        {
            matchcount1=matchcount1+1;

            payout=100;
            jackpot=jackpot+100000;
        }
        else if(match==2)
        {
            matchcount2=matchcount2+1;

            jackpot=jackpot+250000;
            payout=1000;
        }
        else if(match==3)
        {
            matchcount3=matchcount3+1;

            jackpot=jackpot+500000;
            payout=10000;
        }
        else if(match==4)
        {
            matchcount4=matchcount4+1;

            jackpot=jackpot+1000000;
            payout=100000;
        }
        else if(match==5)
        {
            matchcount5=matchcount5+1;

            payout=jackpot;
            jackpot=jackpot-jackpot+2500000;
        }

        System.out.println("Current Jackpot     Player#         Winner#          #Matched      Payout\n"+jackpot+"         "+picks[0]+" "+picks[1]+" "+picks[2]+" "+picks[3]+" "+picks[4]+"    "+cpick[0]+" "+cpick[1]+" "+cpick[2]+" "+cpick[3]+" "+cpick[4]+"        "+match+"            "+payout+"\nThe percent of plays where 0 numbers matched = "+matchcount0/i*100+"%\nThe percent of plays where 1 numbers matched = "+matchcount1/10+"%\nThe percent of plays where 2 numbers matched = "+matchcount2/10+"%\nThe percent of plays where 3 numbers matched = "+matchcount3/10+"%\nThe percent of plays where 4 numbers matched = "+matchcount4/10+"%\nThe percent of plays where 5 numbers matched = "+matchcount5/10+"%\n");
    }
}

Answer 1

使用 StringBuilder 类。在每次运行中，您只需在 StringBuilder 实例的第二行附加新行即可。

StringBuilder builder = new StringBuilder();
for (int i = 0; i < 10; ++i) {
    builder.append(System.getProperty("line.separator") + "Current Jackpot player...");
}

一切完成后就可以使用了

builder.toString();

获取输出。