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2 Visit us at Full Curriculum Solutions M/C Review Question Banks Live Programming Problems Tons of great content!
3 Scanner kb = new Scanner(System.in); int val = kb.nextint();
4 A data file is a sequential list of data. nums.dat
5 Output file stream Input file stream The program sends data to the file. Java Program The program gets data from the file. The program is always in control when working with files.
6 Scanner file = new Scanner(new File("nums2.dat")); int val = file.nextint(); nums2.dat
7 Scanner is a class in Java that can be used to read in data from the keyboard or from a data file. Scanner can also be used to chop up Strings.
8 Scanner kb = new Scanner(System.in); Scanner chopper = new Scanner("a b c d e"); Scanner file = new Scanner(new File("pr21.dat"));
9 Scanner keyboard = new Scanner(System.in); object / reference constructor parameter Scanner file = new Scanner(new File("prxx.dat"));
10
11 Scanner frequently used methods Name nextint() nextdouble() next() nextline() hasnextint() hasnextdouble() hasnext() Use returns the next int value returns the next double value returns the next one word String returns the next multi word String checks to see if there are more ints checks to see if there are more doubles checks to see if there are more Strings import java.util.scanner;
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13 for.dat # of data sets (6)
14 Scanner file = new Scanner(new File("for.dat")); int cnt = file.nextint(); for(int i=0; i<cnt; i++) { int num = file.nextint(); out.println(num); }
15 Scanner file = new Scanner(new File("for.dat")); int cnt = file.nextint(); for(int i=0; i<cnt; i++) { int num = file.nextint(); out.println(num); } for.dat OUTPUT
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17 Visit us at Full Curriculum Solutions M/C Review Question Banks Live Programming Problems Tons of great content!
18 while.dat # of data sets (?)
19 Scanner file = new Scanner(new File("while.dat")); while(file.hasnextint()) { int num = file.nextint(); out.println(num); }
20 Scanner file = new Scanner(new File("while.dat")); while(file.hasnextint()) { int num = file.nextint(); out.println(num); } while.dat OUTPUT
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22 forlines.dat 3 I went to the store. The big dog ran. How are you doing? # of data sets (3)
23 Scanner file; file = new Scanner(new File("forlines.dat")); int cnt = file.nextint(); file.nextline(); //clear out whitespace for(int i=0; i<cnt; i++) { String sentence = file.nextline(); out.println(sentence); }
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25 whilelines.dat I went to the store. The big dog ran. How are you doing? # of data sets (?)
26 Scanner file; file = new Scanner( new File("whilelines.dat")); while(file.hasnext()) { out.println(file.nextline()); }
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29 Visit us at Full Curriculum Solutions M/C Review Question Banks Live Programming Problems Tons of great content!
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31 PrintWriter fileout = new PrintWriter( new FileWriter("out.dat"));
32 PrintWriter fileout = new PrintWriter( new FileWriter("out.dat")); for(int i=0; i<10; i++) { fileout.println(i); } fileout.close();
33 Every file you open you must also close. file.close(); kb.close();
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37 Visit us at Full Curriculum Solutions M/C Review Question Banks Live Programming Problems Tons of great content!
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