How to execute a selected statement?

Problem with a Java if Statement using an array?

• I am writing a program and am having difficulty with a particular if statement, that does not seem to be acting the way it should. I have an array of JTextFields, w1TF[], and in this portion of the program I am using a "for loop" to increment through and read the text fields. The if statement is used to determine if a text field is blank, and if it is blank it will skip it, otherwise it will parse the string to a double and write it to an excel file. Below is the code snippet for this portion: for(int i=0, j=1; i<determination-1; i++, j++){ String cnS, cw1S, cw2S, cw3S, cvS; String uniqS = snString+j; Cell uniqC = resWS.findCell(uniqS); int uniqRow = uniqC.getRow(); if(w1TF[i].getText() != ""){ cw1S = w1TF[i].getText(); double c1 = Double.parseDouble(cw1S); Number c1Cell = new Number(7, uniqRow, c1); resWWS.addCell(c1Cell); } } The problem I am having is that the if statement is not working and it is executing the code regardless of whether the Text Field is blank or not, and then causing an error when attempting to parse the double. I have tried different variations like: if(w1TF[i].getText() != null) and even if(w1TF[i].getText() != "g") and then putting g in the text field and it will still execute. I even put a System.out.println(w1TF[i].getText()); and it will show me that the field is reading "" or "g", yet it still executes. I was able to change it to: if(w1TF[i].getText() == "g") and test it by putting the g in the text field or not, and it then executed normally. I am not sure why it is giving me problems with the if statement using the != "". Any help would be greatly appreciated. Thank you.

• Answer:

  Do you want to check whether there exists some thing in the textfield or not. It should not be null. Why dont you think of doing like this if(w1TF[i].getText().length()>0) { }