java 遍历MAP的几种方法示例代码
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2024-03-13 08:22:09
java中遍历map的几种方法
map map=new hashmap(...
java中遍历map的几种方法
map<string,string> map=new hashmap<string,string>(); map.put("username", "qq"); map.put("password", "123"); map.put("userid", "1"); map.put("email", "qq@qq.com"); map<string,string> map=new hashmap<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
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()); } 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()); }
用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); } 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); }
用entryset()迭代
iterator it=map.entryset().iterator(); system.out.println( map.entryset().size()); string key; string value; while(it.hasnext()){ map.entry entry = (map.entry)it.next(); key=entry.getkey().tostring(); value=entry.getvalue().tostring(); system.out.println(key+"===="+value); }
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