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Java泛型PECS(Java generics PECS)

 我知道PECS是什么意思。  
 制作人扩展，消费者超级。  
 问题是我如何知道它是消费者还是生产者？  
 此代码也遵循“PECS”  
public class Tree<T> {

    //List of branches for this tree
    private List<Tree<? super T>> branch = new ArrayList<Tree<? super T>>();
    public Tree(T t){ this.t = t; }
    public void addBranch(Tree< ? super T> src){ branch.add(src); }
    public Tree<? extends T> getBranch(int branchNum){
        return (Tree<? extends T>) branch.get(branchNum);
    }
    private T t;
}

I know what is the meaning of PECS. 
Producer Extends,Consumer Super. 
the thing is how would I know if its a consumer or producer? 
Also does this code follow the "PECS" 
public class Tree<T> {

    //List of branches for this tree
    private List<Tree<? super T>> branch = new ArrayList<Tree<? super T>>();
    public Tree(T t){ this.t = t; }
    public void addBranch(Tree< ? super T> src){ branch.add(src); }
    public Tree<? extends T> getBranch(int branchNum){
        return (Tree<? extends T>) branch.get(branchNum);
    }
    private T t;
}

原文：https://stackoverflow.com/questions/12197685

更新时间：2023-08-19 16:08

最满意答案

 我最喜欢这样做的方法很简单：  
str = '<img src="' + ary.join('"/><img src="') + '"/>';
 
 这将为您提供一串图像标签。 如果你想在jQuery中这样做，比如：  
(".IT_Icon").each(function(){
    var $this = $(this);
    $this.html('<img src="' + $this.text() + '"/>');
});
 
 你想要一个字符串吗？ 修改HTML？ 

My favorite way to do this is simply: 
str = '<img src="' + ary.join('"/><img src="') + '"/>';
 
which will give you a single string of image tags. If you want to do it in jQuery, something like: 
(".IT_Icon").each(function(){
    var $this = $(this);
    $this.html('<img src="' + $this.text() + '"/>');
});
 
Are you trying to get a string? amend the HTML?