Java：将地图作为函数参数传递
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Java: Passing a Map as a function parameter
提问by TeamBlast
I'm new to Java, and need to know how to pass an associative array (Map) as a single parameter in a function.
我是 Java 新手，需要知道如何在函数中将关联数组 (Map) 作为单个参数传递。
Here's what I'm wanting to do in Java, shown in PHP.
这是我想要在 Java 中执行的操作，以 PHP 显示。
<?php
public class exampleClass {
public function exampleFunction($exampleParam){
if(isset($exampleParam['exampleKey'])){
return true;
}
else {
return false;
}
}
}
$ourMap = array(
'exampleKey' => "yes, it is set"
);
$ourClass = new exampleClass();
$ourResult = $ourClass->exampleFunction($ourMap);
if(!$ourResult){
echo "In Map";
}
else {
echo "Not in Map";
}
?>
回答by Sebastian Paaske T?rholm
public boolean foo(Map<K,V> map) {
...
}
Where Kis the type of the keys, and Vis the type of the values.
其中K是键V的类型， 是值的类型。
Note that Mapis only an interface, so to create such a map, you'll need to create an instance of HashMapor similar, like so:
请注意，这Map只是一个界面，因此要创建这样的地图，您需要创建一个HashMap或类似的实例，如下所示：
Map<K,V> map = new HashMap<K, V>();
foo(map);
See also:
也可以看看：
回答by phihag
public class ExampleClass {
public boolean exampleFunction(Map<String,String> exampleParam) {
return exampleParam.containsKey("exampleKey");
}
public static void main(String[] args) {
Map<String,String> ourMap = new HashMap<String,String>();
ourMap.put("exampleKey", "yes, it is set");
ExampleClass ourObject = new ExampleClass();
boolean ourResult = ourObject.exampleFunction(ourMap);
System.out.print(ourResult ? "In Map" : "Not in Map");
}
}
As you can see, just use a Map.
如您所见，只需使用Map。
