I'm making a program in java that will use a string array say:
String[] category = new String[46];
Then I will check if the array in a for loop if it already has a value,
for(int checking = 21; checking <= 45 ;checking++) {
if(category[checking]=INSERT_HERE) {
textArea += category[checking] + "\n";
}
}
What do I put in INSERT_HERE? Note: textArea is a named JTextArea.
If you are making a check if the value is not null, then use
if(category[checking]!=null)
And if you are making a check for some particular value, then
if(category[checking].equals(PARTICULAR_VALUE))
PS: '=' is for assignment, you should use '==' for comparison.
u have to checkout if it is not null use like this:
if(category[checking] != null) // will check all filled values only
When you define your array as
String[] category=new String[46];
you allocate 46 reference slots in memory for your array. These slots are initially null, so when you need to do a comparison like the one you asked, you need to check against null.
...
if(category[checking] != null)
...
You could try something like that in your code:
for(int checking=21;checking<=45;checking++) {
if(category[checking] != null) {
textArea+=category[checking] +"\n";
}
}
Or like that:
for(int checking=21;checking<=45;checking++) {
if(category[checking] != "") {
textArea+=category[checking] +"\n";
}
}
for(int checking=21;checking<=45;checking++) {
if(category[checking] != null || category[checking] != "") {
textArea += category[checking] +"\n";
}
}
category[checking] != null && !category[checking].isEmpty()
null, so check if it is not that.if(category[checking] != null).if(category[checking]!=null)