linux下安装JDK

Map map = new HashMap();
map.put(1, "aa");
map.put(2, "bb");
map.put(3, "cc");

//将map用set遍历
/*
Set<Map.Entry> set = (Set<Map.Entry>)map.entrySet();

for(Map.Entry entry : set){
System.out.println(entry.getKey()+"=="+entry.getValue());
}
写道

//将map添加到迭代器中遍历
Iterator iterator = map.entrySet().iterator();
while(iterator.hasNext()){
Map.Entry<Iterator, String> en = (Map.Entry<Iterator, String>)iterator.next();
System.out.println(en.getKey()+"=="+en.getValue());
}

for(Iterator iterator = map.entrySet().iterator() ; iterator.hasNext();){
Map.Entry<Iterator, String> en = (Map.Entry<Iterator, String>)iterator.next();
System.out.println(en.getKey()+"=="+en.getValue());
}