Question

I am trying to use a do…while loop that loops based on the id’s in my array. I am a little new to using the do while loop, so am having some trouble incorporating the array into the thing. Here is my relevant code:

    String studentId   = StringUtils.defaultString(request.getParameter("Student_ID"));
    String studentId1  = StringUtils.defaultString(request.getParameter("Student_ID1"));   
    String studentId2  = StringUtils.defaultString(request.getParameter("Student_ID2"));
    String studentId3  = StringUtils.defaultString(request.getParameter("Student_ID3"));
    String studentId4  = StringUtils.defaultString(request.getParameter("Student_ID4"));
    String studentId5  = StringUtils.defaultString(request.getParameter("Student_ID5"));
    String studentId6  = StringUtils.defaultString(request.getParameter("Student_ID6"));
    String studentId7  = StringUtils.defaultString(request.getParameter("Student_ID7"));
    String studentId8  = StringUtils.defaultString(request.getParameter("Student_ID8"));
    String studentId9  = StringUtils.defaultString(request.getParameter("Student_ID9"));


    String[] studentArray;
    studentArray = new String [15];
        studentArray[0]  = studentId;          studentArray[1]  = studentId1;
        studentArray[2]  = studentId2;         studentArray[3]  = studentId3;
        studentArray[4]  = studentId4;         studentArray[5]  = studentId5;
        studentArray[6]  = studentId6;         studentArray[7]  = studentId7;
        studentArray[8]  = studentId8;         studentArray[9]  = studentId9;


do {
    // blah blah blah
} while (  // Here is where I want to tell it to loop for every student in my array.  It should not run for id's that are empty strings(*if possible));

See comments for a more clear explanation. The StringUtils.defaultString that is used when i am getting my parameters will give me an empty string if the param receives a NULL. So if possible I would like to take that into account, and not run my “do {}” statements when the particular array ID is an empty string. Thanks in advance for the help, and if you have any questions, please ask.

Answer 1

This is better done using a for each loop:

for(String x:studentArray){
  // do what you want to do with x
}

To skip over values that are null, just insert an if check at the beginning of the loop and continue if x is empty.