Java中具有多个条件的迭代器循环

Question

So I'm aware that you can create a for loop with several conditions:

for (int i=0; i<5&&i%2!=1; i++){
//Do something
}

Can the same thing be done in a iterator loop, if so, could an example be given:

String[] arrayofstrings = {"Hello", "World"};
for (String s : arrayofstrings){
//Do something
}

Answer 1

No you can't add conditions in the foreach loop. It can only be used to iterate through the elements.

It can only be like:

for (String s : arrayofstrings){
//Do something
}

and it can't be like:

for (String s : arrayofstrings && some condition){
//Do something
}

Answer 2

Uh, your question is very unclear here.

The first example is a forloop, where the middle section with the conditions is the condition that checks when to stop. Basically, you can think of it as a while loop.

for(int i = 0; i < 5 && i != 3; i++) {
    doSomething();
}

is the same as

int i = 0;
while(i < 5 && i != 3) {
    doSomething();
    i++;
}

The second one just iterates through the items in your list. There is no sort of condition...

String[] arrayofstrings = {"Hello", "World"};
for(String s : arrayofstrings) {
    System.out.prinltn(s);
}

Will print out

Hello

World

What sort of condition would you want here. It is basically the equivalent of doing

String[] arrayofstrings = {"Hello", "World"};
for(int i = 0; i < arrayofstrings.length; i++) {
    System.out.println(arrayofstrings[i]);
}

There is no condition being evaluated or a time to stop...