java 遍历MAP的几种方法示例代码
java中遍历MAP的几种方法
Map<String,String>map=newHashMap<String,String>();
map.put("username","qq");
map.put("passWord","123");
map.put("userID","1");
map.put("email","qq@qq.com");
Map<String,String>map=newHashMap<String,String>();
map.put("username","qq");
map.put("passWord","123");
map.put("userID","1");
map.put("email","qq@qq.com");
第一种用for循环
for(Map.Entry<String,String>entry:map.entrySet()){
System.out.println(entry.getKey()+"--->"+entry.getValue());
}
for(Map.Entry<String,String>entry:map.entrySet()){
System.out.println(entry.getKey()+"--->"+entry.getValue());
}
第二种用迭代
Setset=map.entrySet();
Iteratori=set.iterator();
while(i.hasNext()){
Map.Entry<String,String>entry1=(Map.Entry<String,String>)i.next();
System.out.println(entry1.getKey()+"=="+entry1.getValue());
}
Setset=map.entrySet();
Iteratori=set.iterator();
while(i.hasNext()){
Map.Entry<String,String>entry1=(Map.Entry<String,String>)i.next();
System.out.println(entry1.getKey()+"=="+entry1.getValue());
}
用keySet()迭代
Iteratorit=map.keySet().iterator();
while(it.hasNext()){
Stringkey;
Stringvalue;
key=it.next().toString();
value=map.get(key);
System.out.println(key+"--"+value);
}
Iteratorit=map.keySet().iterator();
while(it.hasNext()){
Stringkey;
Stringvalue;
key=it.next().toString();
value=map.get(key);
System.out.println(key+"--"+value);
}
用entrySet()迭代
Iteratorit=map.entrySet().iterator();
System.out.println(map.entrySet().size());
Stringkey;
Stringvalue;
while(it.hasNext()){
Map.Entryentry=(Map.Entry)it.next();
key=entry.getKey().toString();
value=entry.getValue().toString();
System.out.println(key+"===="+value);
}
以上就是对Java遍历MAP的资料整理，后续继续补充相关资料，谢谢大家对本站的支持！