java - do while string is NOT null or empty

java arrays for-loop

23,228

You can use break to exit a for loop, same as you would a switch statement:

String[] wepN = new String[100];                        
int wepQty = 0;

for (int i=0; i < wepN.length; i++) {
    if (data.getItems().get(i).getName() == null || "".equals(data.getItems().get(i).getName())) {
        System.out.println(data.getItems().get(i).getName() + " -NO MOARE");
        break;
    }
    wepN[i] = data.getItems().get(i).getName();
    wepQty++;
}

23,228

Author by

test

I'm a human being. Always learning.

Updated on July 07, 2022

Comments

test almost 2 years
OK so here is some logic thinking... What I am trying to do is loop through strings until I hit a null/empty string.. then STOP. All while putting those strings inside a string array...

Here is a sample of the code. I know it's wrong but hopefully to give you an idea of what I am trying to achieve:
```
int i;
wepN = new String[100];
int wepQty = 0;
boolean anyLeft = true;
while (anyLeft == true) {
for(i = 0;i < 100;i++) {
    if (data.getItems().get(i).getName() == null) {
        anyLeft = false;
        System.out.println(data.getItems().get(i).getName() + " -NO MOARE");
    }
        wepN[i] = data.getItems().get(i).getName();
        wepQty++;

}
}
```
- Blessed Geek almost 14 years
  
  "No moare"! Was that a deliberate typo? Do you speak Maineglish? In other words, are/were you from Maine. e.g., close the doare. That's a pretty flowah.
- test almost 14 years
  
  It's meant to say "No more". Sorry for my English.
- Gunslinger47 almost 14 years
  
  You likely want to store the value of data.getItems() so you're only calling it once. It's likely to be a very expensive operation.
jayshao almost 14 years

I wouldn't recommend jumping straight to a Collection - you could have an interface that requires String[], or have some other reason for preferring it.
Gunslinger47 almost 14 years

If it implements Iterable, it can be used in a for each loop.
Gunslinger47 almost 14 years

wepQty and i are always equal. Thus, i is unnecessary.
Gunslinger47 almost 14 years

My comment on NullUserException's answer also applies here. stackoverflow.com/questions/3296165/…
Gunslinger47 almost 14 years

You can test if a String is equal to "" by saying str.isEmpty().
jayshao almost 14 years

@Gunslinger47 while you can call str.isEmpty() and in this case since we do a null check first it's safe, it's still a good habit in a lot of cases to prefer the older "".equals() since it's always null-safe and String interning means it's not really any less efficient.