本文实例分析了java遍历Map的几种方法。分享给大家供大家参考,具体如下:
Java代码:
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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" );
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第一种用for循环
Java代码:
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for (Map.Entry<String, String> entry:map.entrySet())
{
System.out.println(entry.getKey()+ "--->" +entry.getValue());
}
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第二种用迭代
Java代码:
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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());
}
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用keySet()迭代
Java代码:
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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);
}
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用entrySet()迭代
Java代码:
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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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希望本文所述对大家java程序设计有所帮助。