Better way to write multiple if statements in java

Question

Hi so lately I've been doing a lot of java programming and I've been using a lot of if statements. the problem is i have to copy and paste the if statements over a hundred times to check all the senarios. Here is an example:

while (i < AreaNumbers.size()) {
        String roomnum = "j" + AreaNumbers.get(i);
        if (roomnum.equals("j100")) {
            if (k == 1) {
                j100.setVisible(true);
                j100.setToolTipText("<html>" + "<br>" + "Room Number: " + AreaNumbers.get(i) + "<br>" + "Incident ID: " + IncidentID.get(i) + "<br>" + " Teacher: " + Teachers.get(i) + "<br>" + " Description: " + Descriptions.get(i) + "</html>");
                k = k + 1;
            } else if (k > 0) {
                j100.setToolTipText(k + " help desk calls, click here for more information");
                k = k + 1;
            }

for this example i would copy and paste the if (roomnum.equals("j100")) { and everything past it for every label i want to check and compare. Is there anyway i could do this where i could write a statement that goes through this same scenario once and everywhere it sees j100 it could replace it after each time with a different label, such as j101 j107 an so on. Im sorry if this isnt very clear i just cant think of a better way to word it. Thanks in advance.

Answer 1

Don't use numbered variable names (like j100 , j101 , etc.). Use an array instead, so you can loop over them programatically:

SomeType[] j = new SomeType[1000];

for (int z = 0; z < j.length; z++) {
    j[z] = new SomeType();

    j[z].setTooltipText("Hello world");
}

Depending on what you need to do, you may want to investigate the more advanced collections classes instead of simple arrays.

Answer 2

you could use a Map<String, Runnable> using the label as the key and to a Runnable . Depending on how you write you Runnable subclasses, this could alleviate a lot of redundancy.

if( myMap.containsKey( myLabel ) ) {
  myMap.get(myLabel).run();
}

Better way to write multiple if statements in java

Question

2 answers

solution1
9 ACCPTED 2011-01-25 00:02:41

solution2
0 2011-01-25 00:02:05

Better way to write multiple if statements in java

Question

2 answers

solution1 9 ACCPTED 2011-01-25 00:02:41

solution2 0 2011-01-25 00:02:05

solution1
9 ACCPTED 2011-01-25 00:02:41

solution2
0 2011-01-25 00:02:05