一、准备数据
Map<String,String> map=new HashMap<String,String>();
map.put("username", "admin");
map.put("passWord", "admin");
map.put("userID", "1");
map.put("email", "shuaige@qq.com");
二、上干货
方法一、for循环
for(Map.Entry<String, String> entry:map.entrySet()){
System.out.println(entry.getKey()+"--->"+entry.getValue());
}
方法二、迭代
Set set = map.entrySet();
Iterator i = set.iterator();
while(i.hasNext()){
Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next();
System.out.println(entry1.getKey()+"=="+entry1.getValue());
}
方法三、keySet()迭代
Iterator it=map.keySet().iterator();
while(it.hasNext()){
String key;
String value;
key=it.next().toString();
value=map.get(key);
System.out.println(key+"--"+value);
}
方法四、entrySet()迭代
Iterator it=map.entrySet().iterator();
String key,value;
while(it.hasNext()){
Map.Entry entry = (Map.Entry)it.next();
key=entry.getKey().toString();
value=entry.getValue().toString();
System.out.println(key+"===="+value);
}
方法五、lambda foreach
map.keySet().stream().forEach(key -> {
System.err.println(key + "=====" + map.get(key));
});