java.lang.ClassCastException:java.util.HashMap $ EntrySet无法转换为java.util.Map $ Entry [英] java.lang.ClassCastException: java.util.HashMap$EntrySet cannot be cast to java.util.Map$Entry

问题描述

我有一个像这样的替代方法

I have an overrriden method like this

@Override
public Build auth (Map.Entry<String, String> auth) {
            this.mAuth = auth;
            return this;
}

这里尝试通过以下方式调用此方法

Here am trying to call this method in the following way

Map<String, String> authentication = new HashMap<String , String> ();        
         authentication.put("username" , "testname");
         authentication.put("password" , "testpassword");        

Map.Entry<String, String> authInfo =(Entry<String , String>) authentication.entrySet();

AuthMethod.auth(authInfo)

正在运行的同时获取

java.lang.ClassCastException: java.util.HashMap$EntrySet cannot be cast to java.util.Map$Entry

如何将Map.Entry<String, String>传递给身份验证方法

How can i pass Map.Entry<String, String> to auth method

推荐答案

您正尝试将集合转换为单个条目.

You are trying to cast a set to a single entry.

您可以通过迭代设置来使用每个条目:

You can use each entry item by iterating the set:

Iterator it = authentication.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry entry = (Map.Entry)it.next(); //current entry in a loop
    /*
     * do something for each entry
     */
}

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