Java软件工程的弹幕调试原则

日期：2019.4.25

博客期：061

星期四

       今天是把很久之前的那个相关程序——一维数组的最大和的子数组的求取信息，我们今天的任务就是把每一步的信息都要进行输出查看！

       如下图：

　　

package pvp;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.Random;
import java.util.Scanner;

public class TestPlay6 {
    public static void run(){
        File f = new File("data/data.txt");
        if(!f.exists())
        {
            System.out.println("文件不存在!");
            System.exit(0);
        }
        //存储导入内容
        String str;
        //内容
        Scanner sc = null;
        try {
            sc = new Scanner(f);
        } catch (FileNotFoundException e1) {
            System.out.println("文件不存在!");
            System.exit(0);
        }
        //最大值
        BigInteger rmax = new BigInteger("0");
        //正数总值
        BigInteger Tnum = new BigInteger("0");
        //负数总值
        BigInteger Fnum = new BigInteger("0");
        //记录是否发生转变
        int sis = 0;
        //标记是第几程度
        int attitude = 0;
        
        BigInteger start = BigInteger.ZERO,end = BigInteger.ZERO;
        BigInteger true_start = BigInteger.ZERO,true_end = BigInteger.ZERO;
        //循环
        try
        {
            BigInteger sis_s = rmax;
            BigInteger seat = new BigInteger("0");
            if(!sc.hasNext())
            {
                System.out.println("文件内容为空!");
                System.exit(0);
            }
            while(sc.hasNext())
            {
                str = sc.next();
                BigInteger p = new BigInteger(str);
                seat = seat.add(BigInteger.ONE);
                end = seat;
                if(attitude==0)                    //---------------------------------------[寻找第一个正数]
                {
                    if(p.compareTo(new BigInteger("0"))<=0)
                        ;
                    else
                    {
                        start = seat;
                        Tnum = p;
                        attitude = 1;
                    }
                }
                else if(attitude==1)            //---------------------------------------[上一个数为正数]
                {
                    if(p.compareTo(new BigInteger("0"))<0)
                    {
                        if(sis==0)
                        {
                            sis = 1;
                            Fnum.add(p);
                        }
                        else
                        {
                            Fnum = p;
                        }
                        attitude = -1;
                    }
                    else
                    {
                        Tnum = Tnum.add(p);
                    }

                    if(Tnum.compareTo(rmax)>0)
                    {
                        rmax = Tnum;
                        true_start = start;
                        true_end = end;
                    }
                }
                else                            //---------------------------------------[上一个数为负数]
                {
                    if(p.compareTo(new BigInteger("0"))>0)
                    {
                        attitude = 1;
                        if(Tnum.compareTo(new BigInteger("0").subtract(Fnum))>0)
                        {
                            Tnum = Tnum.add(Fnum).add(p);
                        }
                        else
                        {
                            Tnum = p;
                            start = seat;
                        }
                    }
                    else
                    {
                        Fnum = Fnum.add(p);
                    }
                }
                if(p.compareTo(rmax)>0)
                {
                    rmax = p;
                    true_start = start;
                    true_end = end;
                }
                if(p.compareTo(Tnum)>0)
                {
                    rmax = Tnum;
                    true_start = start;
                    true_end = end;
                }
                if(rmax.equals(sis_s))
                    System.out.println("数据编号:"+seat.toString()+"	,新数大小:"+p.toString()+"	,正数总值:"+Tnum.toString()+"	,负数总值:"+Fnum.toString()+"	,数组从第"+true_start.toString()+"	位开始到第"+true_end.toString()+"	位结束,最大值:"+rmax.toString()+"	");
                else
                {
                    System.err.println("数据编号:"+seat.toString()+"	,新数大小:"+p.toString()+"	,正数总值:"+Tnum.toString()+"	,负数总值:"+Fnum.toString()+"	,数组从第"+true_start.toString()+"	位开始到第"+true_end.toString()+"	位结束,最大值:"+rmax.toString()+"	");
                    sis_s = rmax;
                }
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO 自动生成的 catch 块
                    e.printStackTrace();
                }
            }
            
        }
        catch( NumberFormatException e){
            System.out.println("输入内容不是数字!");
            System.exit(0);
        }
        sc.close();
    }
    public static void run2(int ls){
        File f = new File("data/data.txt");
        if(!f.exists())
        {
            System.out.println("文件不存在!");
            System.exit(0);
        }
        //存储导入内容
        String str;
        //内容
        Scanner sc = null;
        try {
            sc = new Scanner(f);
        } catch (FileNotFoundException e1) {
            System.out.println("文件不存在!");
            System.exit(0);
        }
        //最大值
        BigInteger rmax = new BigInteger("0");
        //正数总值
        BigInteger Tnum = new BigInteger("0");
        //负数总值
        BigInteger Fnum = new BigInteger("0");
        //记录是否发生转变
        int sis = 0;
        //标记是第几程度
        int attitude = 0;
        
        BigInteger start = BigInteger.ZERO,end = BigInteger.ZERO;
        BigInteger true_start = BigInteger.ZERO,true_end = BigInteger.ZERO;
        //循环
        try
        {
            BigInteger sis_s = rmax;
            BigInteger seat = new BigInteger("0");
            if(!sc.hasNext())
            {
                System.out.println("文件内容为空!");
                System.exit(0);
            }
            BigInteger sss = new BigInteger(Integer.toString(ls));
            while(sc.hasNext())
            {
                str = sc.next();
                BigInteger p = new BigInteger(str);
                seat = seat.add(BigInteger.ONE);
                end = seat;
                if(attitude==0)                    //---------------------------------------[寻找第一个正数]
                {
                    if(p.compareTo(new BigInteger("0"))<=0)
                        ;
                    else
                    {
                        start = seat;
                        Tnum = p;
                        attitude = 1;
                    }
                }
                else if(attitude==1)            //---------------------------------------[上一个数为正数]
                {
                    if(p.compareTo(new BigInteger("0"))<0)
                    {
                        if(sis==0)
                        {
                            sis = 1;
                            Fnum.add(p);
                        }
                        else
                        {
                            Fnum = p;
                        }
                        attitude = -1;
                    }
                    else
                    {
                        Tnum = Tnum.add(p);
                    }

                    if(Tnum.compareTo(rmax)>0)
                    {
                        rmax = Tnum;
                        true_start = start;
                        true_end = end;
                    }
                }
                else                            //---------------------------------------[上一个数为负数]
                {
                    if(p.compareTo(new BigInteger("0"))>0)
                    {
                        attitude = 1;
                        if(Tnum.compareTo(new BigInteger("0").subtract(Fnum))>0)
                        {
                            Tnum = Tnum.add(Fnum).add(p);
                        }
                        else
                        {
                            Tnum = p;
                            start = seat;
                        }
                    }
                    else
                    {
                        Fnum = Fnum.add(p);
                    }
                }
                if(p.compareTo(rmax)>0)
                {
                    rmax = p;
                    true_start = start;
                    true_end = end;
                }
                if(p.compareTo(Tnum)>0)
                {
                    rmax = Tnum;
                    true_start = start;
                    true_end = end;
                }
                if(sss.compareTo(seat)<=0)
                {
                    if(rmax.equals(sis_s))
                        System.out.println("数据编号:"+seat.toString()+"	,新数大小:"+p.toString()+"	,正数总值:"+Tnum.toString()+"	,负数总值:"+Fnum.toString()+"	,数组从第"+true_start.toString()+"	位开始到第"+true_end.toString()+"	位结束,最大值:"+rmax.toString()+"	");
                    else
                    {
                        System.err.println("数据编号:"+seat.toString()+"	,新数大小:"+p.toString()+"	,正数总值:"+Tnum.toString()+"	,负数总值:"+Fnum.toString()+"	,数组从第"+true_start.toString()+"	位开始到第"+true_end.toString()+"	位结束,最大值:"+rmax.toString()+"	");
                        sis_s = rmax;
                    }
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO 自动生成的 catch 块
                        e.printStackTrace();
                    }
                }
            }
            
        }
        catch( NumberFormatException e){
            System.out.println("输入内容不是数字!");
            System.exit(0);
        }
        sc.close();
    }
    public static void FileMaker(BigInteger leng,BigInteger min,BigInteger max){
        File f = new File("data/data.txt");
        if(!f.exists())
        {
            try {
                f.createNewFile();
            } catch (IOException e) {
                //Do Nothing...
            }
        }
        PrintWriter pw = null;
        try {
            pw = new PrintWriter(f);
        } catch (FileNotFoundException e) {
            System.out.println("文件不存在！");
            System.exit(0);
        }
        Random ra = new Random(System.currentTimeMillis());
        BigInteger bi = new BigInteger("1");
        
        BigInteger sumL = max.subtract(min).add(BigInteger.ONE);
        
        while(bi.compareTo(leng)<=0)
        {
            long x = ra.nextLong();
            BigInteger bnum = new BigInteger(Long.toString(x));
            bnum = bnum.mod(sumL).add(min);
            pw.println(bnum.toString());
            bi = bi.add(BigInteger.ONE);
        }
        pw.close();
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入数据量:");
        String str = sc.next();
        System.out.println("请输入数据范围:");
        String str1 = sc.next();
        String str2 = sc.next();
        System.out.println("确定是否查看关键步骤");
        boolean isKey = false;
        try{
            isKey = sc.nextBoolean();
            BigInteger leng = new BigInteger(str);
            BigInteger num1 = new BigInteger(str1);
            BigInteger num2 = new BigInteger(str2);
            if(num1.compareTo(num2)==0)
                throw new Exception();
            else if(leng.compareTo(BigInteger.ZERO)<0)
                throw new Exception();
            else
            {
                if(num1.compareTo(num2)<0)
                    FileMaker(leng,num1,num2);
                else
                    FileMaker(leng,num2,num1);
            }
        }catch(Exception e){
            System.out.println("爷爷！出现问题了！");
            System.exit(0);
        }
        
        if(!isKey)
            run();
        else
        {
            run();
            try{
                int l = sc.nextInt();
                run2(l);
            }catch (Exception e){
                //Do Nothing...
            }
        }
        sc.close();
    }
}