java - 如何通过列表

Question

This is my generic construtor

public TreeContainer(Class<T> type, Object parentPID, List<Object> childrensPID) throws IllegalArgumentException {
    super(type);
    this.parentPID = parentPID;
    this.childrensPID = childrensPID;
}

This is my bean (with getter setter)

public class DirectoryBean implements Serializable {
      private long id;
      private String name;
      private DirectoryBean parent;
      private List<DirectoryBean> childrens;    
}

I create a new Tree Container like this

TreeContainer<DirectoryBean> treeContainer = new TreeContainer<DirectoryBean>(DirectoryBean.class,"parent", "childrens" );

But the "childrens" parameter is illegal, how can i pass the list params in this situation

score 1 · Accepted Answer

Your constructor expects this

List<Object> childrensPID

but you are passing a String "childrens". You can get around it by putting it in a list.

List<Object> childrens = new ArrayList<Object>();
childrens.add("childrens");
new TreeContainer<DirectoryBean>(DirectoryBean.class,"parent", childrens );

score 1 · Accepted Answer

可能足以将其更改为? extends Object. 但是，这里使用泛型的目的是限制数据类型的范围。你最好做类似的事情：

? extends BeanBaseObject

2 回答 2

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