java 列表中的多个参数
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Multiple parameters in List
提问by y2p
I want to do something like this
我想做这样的事情
List<Integer, String, String>
I want to be able to iteratively retrieve either of these three parameters. How can I go about it? Thanks
我希望能够迭代地检索这三个参数中的任何一个。我该怎么办？谢谢
采纳答案by jjnguy
What you need is a Tuple class:
你需要的是一个元组类：
public class Tuple<E, F, G> {
public E First;
public F Second;
public G Third;
}
Then you can iterate over the list of the tuple, and look at each entry in the tuple.
然后您可以遍历元组的列表，并查看元组中的每个条目。
List<Tuple<Integer, String, String> listOfTuple;
for (Tuple<Integer, String, String> tpl: listOfTuple){
// process each tuple
tpl.First ... etc
}
回答by Yrlec
You can create a wrapper class which holds these three variables and then store that wrapper-object in the list.
您可以创建一个包含这三个变量的包装类，然后将该包装对象存储在列表中。
For instance
例如
public class ListWrapperClass {
private String firstStringValue;
private String secondStringValue;
private Integer integerValue;
public String getFirstStringValue() {
return firstStringValue;
}
public void setFirstStringValue(String firstStringValue) {
this.firstStringValue = firstStringValue;
}
public String getSecondStringValue() {
return secondStringValue;
}
public void setSecondStringValue(String secondStringValue) {
this.secondStringValue = secondStringValue;
}
public Integer getIntegerValue() {
return integerValue;
}
public void setIntegerValue(Integer integerValue) {
this.integerValue = integerValue;
}
}
and then use List<ListWrapperClass>.
然后使用List<ListWrapperClass>.
回答by Daniel DiPaolo
You can use a List<Object>and then cast whatever you retrieve based on the index, but you may just consider creating a class that holds these three things.
您可以使用 aList<Object>然后根据索引转换您检索到的任何内容，但您可能只考虑创建一个包含这三个内容的类。
