Iterator equals比较的逻辑误区

public boolean equals(Object o)
{
Iterator iterThis;
Iterator iterThat;
if(!(o instanceof Map))
break MISSING_BLOCK_LABEL_84;
Map that = (Map)o;
if(size() != that.size())
return false;
iterThis = entrySet().iterator();
iterThat = that.entrySet().iterator();
do
if(!iterThis.hasNext())
break MISSING_BLOCK_LABEL_80;
while(iterThis.next().equals(iterThat.next()));
return false;
return true;
ConcurrentModificationException e;
e;
return false;
}

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public boolean equals(Object o) {
Iterator iterThis;
Iterator iterThat;
if (o instanceof Map) {
Map that = (Map) o;
if (size() != that.size())
return false;
iterThis = entrySet().iterator();
iterThat = that.entrySet().iterator();
try {
do
if (!iterThis.hasNext())
break;//注意此行
while (iterThis.next().equals(iterThat.next()));
return true;//注意此行

} catch (ConcurrentModificationException e) {
return false;
}
}
return false;
}

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public boolean equals(Object o) {
Iterator iterThis;
Iterator iterThat;
if (o instanceof Map) {
Map that = (Map) o;
if (size() != that.size())
return false;
iterThis = entrySet().iterator();
iterThat = that.entrySet().iterator();
try {
do
if (!iterThis.hasNext())
return true;
while (iterThis.next().equals(iterThat.next()));
return false;

} catch (ConcurrentModificationException e) {
return false;
}
}
return false;
}

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while(iterThis.hasNext()){
if(!iterThis.next().equals(iterThat.next()))
return false;
}
return true;