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By contract, any implementation of the java.util.Iterator.next()
method should throw a NoSuchElementException
exception when the iteration has no more elements. Any other behavior when the iteration is done could lead to unexpected behavior for users of this Iterator
.
Noncompliant Code Example
public class MyIterator implements Iterator<String>{
...
public String next(){
if(!hasNext()){
return null;
}
...
}
}
Compliant Solution
public class MyIterator implements Iterator<String>{
...
public String next(){
if(!hasNext()){
throw new NoSuchElementException();
}
...
}
}
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