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Thread: How can I read txt files in java program??

  1. #1
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    Default How can I read txt files in java program??

    My code:
    import java.io.*;
     
    public class TV {
     
    	public static void main(String[] args) throws IOException {
     
    		String fileInput=("TV.txt");
     
    		BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
    		if (args.length==1) 
    			fileInput=new String(args[0]);{
    	//If TV.txt doesn't exist, create it!
     
    			PrintWriter out=new PrintWriter(new FileWriter("TV.txt"));
     
    			out.println(0);
     
    			out.close();
     
    		}
     
    		int menu,listsize=0;
     
    		String[] name=new String[500];
     
    		int[] day=new int[500];
     
    		String[] time=new String[500];
     
    		do {
     
    			System.out.println("1. Add a TV Show\n2. Modify TV Show\n3. Delete TV Show\n4. Sort TV Shows\n5. Show all TV Shows\n6. Exit\n7. Save TV Shows\n8. Load TV Shows\nWhat is your choice?");
     
    			menu=Integer.valueOf(in.readLine()).intValue();
     
    			if (menu==1) {
     
    				System.out.print("Enter a show name: ");
    	//read the data
     
    				name[listsize]=in.readLine();
     
    				System.out.print("Which day? (0 for Sunday, 1 for Monday, etc.) ");
     
    				day[listsize]=Integer.valueOf(in.readLine()).intValue();
     
    				if (day[listsize]==7) day[listsize]=0;
    	//auto correct
     
    				System.out.print("Enter the show time (24hr format) : ");
     
    				time[listsize++]=in.readLine();
     
    			}
     else if (menu==2) {
     
    				System.out.print("Enter the show name: ");
     
    				String str=in.readLine();
     
    				int x;
     
    				for (x=0;x<listsize;x++)
     
    					if (str.equals(name[x]))
     
    						break;
     
    				if (x==listsize) {
     
    					System.out.println("Not found");
     
    					continue;
     
    				}
     
    				System.out.print("Enter the new name: ");
     
    				name[x]=in.readLine();
     
    				System.out.print("Which day? (0 for Sunday, 1 for Monday, etc.) ");
     
    				day[x]=Integer.valueOf(in.readLine()).intValue();
     
    				if (day[x]==7) day[x]=0;
    	//auto correct
     
    				System.out.print("Enter the show time (24hr format) : ");
     
    				time[x]=in.readLine();
     
    				System.out.print("x="+x);
     
    			}
     else if (menu==3) {
     
    				System.out.print("Enter the show name: ");
     
    				String str=in.readLine();
     
    				int x;
     
    				for (x=0;x<listsize;x++)
     
    					if (str.equals(name[x]))
     
    						break;
     
    				if (x==listsize) {
     
    					System.out.println("Not found");
     
    					continue;
     
    				}
     
    				for (int y=x;y<listsize;y++) {
     
    					name[y]=name[y+1];
     
    					day[y]=day[y+1];
     
    					time[y]=time[y+1];
     
    				}
     
    				System.out.println("Removed");
     
    				listsize--;
     
    			}
     else if (menu==4) {
     
    				System.out.println("Which way do you want to sort?\n1. name\n2. day\n3. time");
     
    				int way=Integer.valueOf(in.readLine()).intValue();
     
    				if (way==1) {
     
    					for (int x=0;x<listsize;x++) {
    	//sort
     
    						int smallest=x;
     
    						for (int y=x;y<listsize;y++)
     
    							if (name[y].compareTo(name[smallest])<0)
     
    								smallest=y;
     
    						String tmp=name[x];
    	//Swap
     
    						name[x]=name[smallest];
     
    						name[smallest]=tmp;
     
    						tmp=time[x];
     
    						time[x]=time[smallest];
     
    						time[smallest]=tmp;
     
    						int t=day[x];
     
    						day[x]=day[smallest];
     
    						day[smallest]=t;
     
    					}
     
    				}
     else if (way==2) {
     
    					for (int x=0;x<listsize;x++) {
    	//sort
     
    						int smallest=x;
     
    						for (int y=x;y<listsize;y++)
     
    							if ((day[y]<day[smallest]) || ((day[y]==day[smallest])&&(name[y].compareTo(name[smallest])<0)))
     
    								smallest=y;
     
    						String tmp=name[x];
    	//Swap
    						name[x]=name[smallest];
     
    						name[smallest]=tmp;
     
    						tmp=time[x];
     
    						time[x]=time[smallest];
     
    						time[smallest]=tmp;
     
    						int t=day[x];
     
    						day[x]=day[smallest];
     
    						day[smallest]=t;
     
    					}
     
    				} else if (way==3) {
     
    					for (int x=0;x<listsize;x++) {
    	//sort
     
    						int smallest=x;
     
    					for (int y=x;y<listsize;y++)
     
    							if ((time[y].compareTo(time[smallest])<0) || ((time[y].compareTo(time[smallest])==0)&&(name[y].compareTo(name[smallest])<0)))
     
    								smallest=y;
     
    						String tmp=name[x];
    	//Swap
    						name[x]=name[smallest];
     
    						name[smallest]=tmp;
     
    						tmp=time[x];
     
    						time[x]=time[smallest];
     
    						time[smallest]=tmp;
     
    						int t=day[x];
     
    						day[x]=day[smallest];
     
    						day[smallest]=t;
     
    					}
     
    				}
     
    				System.out.println("Sorted");
     
    			}
     else if (menu==5) {
     
    				int[] showPerDay=new int[7];
     
    				System.out.println("Name, Day, Time");
     
    				for (int x=0;x<listsize;x++) {
     
    					System.out.print(name[x]+", ");
     
    					if (day[x]==0) System.out.print("Sun");
     
    					else if (day[x]==1) System.out.print("Mon");
     
    					else if (day[x]==2) System.out.print("Tue");
     
    					else if (day[x]==3) System.out.print("Wed");
     
    					else if (day[x]==4) System.out.print("Thu");
     
    					else if (day[x]==5) System.out.print("Fri");
     
    					else if (day[x]==6) System.out.print("Sat");
     
    					System.out.println(", "+time[x]);
     
    					showPerDay[day[x]]++;
     
    				}
     
    				System.out.println("There are "+showPerDay[0]+" per Sunday, "+showPerDay[1]+" per Monday, "+showPerDay[2]+" per Tuesday, "+showPerDay[3]+" per Wednesday, "+showPerDay[4]+" per Thursday, "+showPerDay[5]+" per Friday, "+showPerDay[6]+" per Saturday");
     
    			}
     else if (menu==7) {
     
    				PrintWriter out=new PrintWriter(new FileWriter("TV.txt"));
     
    				out.println(listsize);
     
    				for (int x=0;x<listsize;x++) {
     
    					out.println(name[x]);
     
    					out.println(day[x]);
     
    					out.println(time[x]);
     
    				}
     
    				out.close();
     
    				System.out.println("Done");
    			}
     else if (menu==8) {
     
    				BufferedReader inFile= new BufferedReader(new FileReader("TV.txt"));
     
    				listsize =Integer.valueOf(inFile.readLine()).intValue();
     
    				for (int y=0;y<listsize;y++) {
     
    					name[y]=inFile.readLine();
     
    					day[y]=Integer.valueOf(inFile.readLine()).intValue();
     
    					time[y]=inFile.readLine();
     
    				}
     
    				System.out.println("Import "+listsize+" shows");
     
    			}
     
    			System.out.println();
     
    		}
     while (menu!=6);
     
    	}
     
    }

    When I press "8", it said imported 0 shows. However, there are 7 shows in my TV.txt file. How can the java program read my TV.txt file properly?? Do I need to write anything specific in the txt file??

    Here is my txt file:

    Cooking Mama, Mon, 08:00 
    Gossip Boy, Tue, 22:00 
    Be Home for Dinner, Wed, 20:00 
    The Big Boy Show, Thurs, 21:30 
    Crime Scene, Fri, 22:00 
    Movie of the Week, Sat, 21:00 
    Cooking with Jim, Sun, 09:00


  2. #2
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    Default Re: How can I read txt files in java program??

    What I do is something like this. Of course, there are many ways to do the same thing
    BufferedReader in = new BufferedReader(new FileReader("filename.txt", true));
    String line;
    while ((line = in.readLine()) != null) {
         //Do what you want with each line
    }

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: How can I read txt files in java program??

    it said imported 0 shows
    What variable prints out the value of 0?
    Where is that variable given a value? Add a println statement after every place the value of that variable changes to see if it is getting the correct value.
    If you don't understand my answer, don't ignore it, ask a question.

  4. #4
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    Default Re: How can I read txt files in java program??

    When I press 8 after I run the program, it should sow me how many TV shows are there since
    System.out.println("Import "+listsize+" shows");

    However, it said 0....

  5. #5
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    Default Re: How can I read txt files in java program??

    Where should I put the code??

  6. #6
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    Default Re: How can I read txt files in java program??

    Where do you assign a value to listsize? Add the following statement immediately after every statement in the code that changes the value of listsize:
    System.out.println("listsize="+listsize);

    The value would be changed by an assignment statement where listsize is to the left of the = operator.
    If you don't understand my answer, don't ignore it, ask a question.

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