Nested loop structure

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  • X106
    New Member
    • Oct 2007
    • 5
    #1

    Nested loop structure

    hi
    i am beginner in java and i need help with programining ,Please if you could suggest me some sites where i can see some solved examples of codes as well as i need code for following

    55551
    55512
    55123
    51234
    12345


    I need a code to make above mentioned , in nested loop form.

    thanks and regards
    Tags: None
    • JosAH
      Recognized Expert MVP
      • Mar 2007
      • 11453
      #2
      Originally posted by X106
      hi
      i am beginner in java and i need help with programining ,Please if you could suggest me some sites where i can see some solved examples of codes as well as i need code for following

      55551
      55512
      55123
      51234
      12345


      I need a code to make above mentioned , in nested loop form.

      thanks and regards
      Try to figure out the regularity: Java counts starting at zero, so there are lines
      0, 1, 2, 3 and 4. On line i (i in [0,4]) there are i+1 '5' characters followed by the
      digits i+1, ... i+2 etc. until 5 characters are printed.

      That observation leeds to a nested loop: the outer loop simply counts from 0 to 4.
      The inner loop also counts from 0 to 4 and uses an if statement to decide whether
      or not to print 5s or simply increasing digits 1, 2, 3 etc. Of course there are many
      ways to solve this little puzzle.

      kind regards,

      Jos

        Comment

        • ajos
          Contributor
          • Aug 2007
          • 283
          #3
          Originally posted by X106
          hi
          i am beginner in java and i need help with programining ,Please if you could suggest me some sites where i can see some solved examples of codes as well as i need code for following

          55551
          55512
          55123
          51234
          12345


          I need a code to make above mentioned , in nested loop form.

          thanks and regards
          i'll give you an example, i hope my fellow TSDN's members wont flame at me--->
          Code:
          <%@ page import="java.util.*" %>
<%@ taglib uri='http://java.sun.com/jstl/core' prefix='c' %>
<html>
<head><title></title></head>
<body>
<%
ArrayList arrList = new ArrayList() ;
ArrayList subList1 = new ArrayList() ;
ArrayList subList2 = new ArrayList() ;
ArrayList subList3 = new ArrayList() ;

subList1.add( "subList1_1" ) ;
subList1.add( "subList1_2" ) ;
subList1.add( "subList1_3" ) ;
subList1.add( "subList1_4" ) ;

subList2.add( "subList2_1" ) ;
subList2.add( "subList2_2" ) ;
subList2.add( "subList2_3" ) ;
subList2.add( "subList2_4" ) ;

subList3.add( "subList3_1" ) ;
subList3.add( "subList3_2" ) ;
subList3.add( "subList3_3" ) ;
subList3.add( "subList3_4" ) ;

arrList.add( subList1 ) ;
arrList.add( subList2 ) ;
arrList.add( subList3 ) ;

request.setAttribute("myList", arrList );
%>

<c:forEach var='mainItem' items='${requestScope.myList}' varStatus='status'>
      Main ArrayList Count: <c:out value='${status.count}'/> <br />
      <c:forEach var='subItem' items='${mainItem}'>
            <font color="red">Names: <c:out value='${subItem}'/></font>
            <br />
      </c:forEach>

</c:forEach>
</body>
</html>

            Comment

            • ajos
              Contributor
              • Aug 2007
              • 283
              #4
              Originally posted by ajos
              i'll give you an example, i hope my fellow TSDN's members wont flame at me--->
              Code:
              <%@ page import="java.util.*" %>
<%@ taglib uri='http://java.sun.com/jstl/core' prefix='c' %>
<html>
<head><title></title></head>
<body>
<%
ArrayList arrList = new ArrayList() ;
ArrayList subList1 = new ArrayList() ;
ArrayList subList2 = new ArrayList() ;
ArrayList subList3 = new ArrayList() ;

subList1.add( "subList1_1" ) ;
subList1.add( "subList1_2" ) ;
subList1.add( "subList1_3" ) ;
subList1.add( "subList1_4" ) ;

subList2.add( "subList2_1" ) ;
subList2.add( "subList2_2" ) ;
subList2.add( "subList2_3" ) ;
subList2.add( "subList2_4" ) ;

subList3.add( "subList3_1" ) ;
subList3.add( "subList3_2" ) ;
subList3.add( "subList3_3" ) ;
subList3.add( "subList3_4" ) ;

arrList.add( subList1 ) ;
arrList.add( subList2 ) ;
arrList.add( subList3 ) ;

request.setAttribute("myList", arrList );
%>

<c:forEach var='mainItem' items='${requestScope.myList}' varStatus='status'>
      Main ArrayList Count: <c:out value='${status.count}'/> <br />
      <c:forEach var='subItem' items='${mainItem}'>
            <font color="red">Names: <c:out value='${subItem}'/></font>
            <br />
      </c:forEach>

</c:forEach>
</body>
</html>
              try to manipulate with this example.

                Comment

                • X106
                  New Member
                  • Oct 2007
                  • 5
                  #5
                  I understand the concept, jos,but I can't write in code, I just wrike like that

                  class NestedLoop {
                  public static void main (String [] a) {
                  int n=5, i, j;
                  for (i = 1; i <=n; i++) {

                  Then I don't know how to write.Can help me how to write in code?

                    Comment

                    • r035198x
                      MVP
                      • Sep 2006
                      • 13225
                      #6
                      Originally posted by X106
                      I understand the concept, jos,but I can't write in code, I just wrike like that

                      class NestedLoop {
                      public static void main (String [] a) {
                      int n=5, i, j;
                      for (i = 1; i <=n; i++) {

                      Then I don't know how to write.Can help me how to write in code?
                      Write the loops that Jos was explaining above.

                        Comment

                        • JosAH
                          Recognized Expert MVP
                          • Mar 2007
                          • 11453
                          #7
                          Originally posted by r035198x
                          Write the loops that Jos was explaining above.
                          ... or go fancy and write a single loop:

                          [code=java]
                          private static void square(int n) { // assume 1 <= n <= 9
                          char[] line= new char[n];
                          Arrays.fill(lin e, (char)('0'+n));
                          String s= new String(line);
                          for (int i= 1; i <= n; i++)
                          System.out.prin tln(s= (s+i).substring (1));
                          }
                          [/code]

                          You can't turn this in because there's no nested loop :-P

                          kind regards,

                          Jos

                            Comment

                            • r035198x
                              MVP
                              • Sep 2006
                              • 13225
                              #8
                              Originally posted by JosAH
                              .....

                              You can't turn this in because there's no nested loop :-P

                              kind regards,

                              Jos
                              Yep, but keep the ideas in mind for the time when you are no longer writing code for school only.

                                Comment

                                • X106
                                  New Member
                                  • Oct 2007
                                  • 5
                                  #9
                                  Thank you ,you all help me a lot!!!!!!!!!!

                                    Comment

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