简体   繁体   English

具有可比接口的Java通用语法

[英]Java Generic syntax with Comparable interface

I am trying to implement a simple insertion sort algorithm and make it generic to all the instance of Comparable interface. 我正在尝试实现一个简单的插入排序算法,并使它对Comparable接口的所有实例通用。

public static <E extends Comparable<E>> void InsertionSort( E [] array)
{
    for(int i = 1; i < array.length; i++)
    {
        E current = array[i];

        int k;
        for(k = i-1; k >= 0 && current.compareTo(array[k]) < 0 ; k--)
        {
            array[k+1] = array[k];

        }

        array[k+1]=current;

    }

    for(int l = 0; l < array.length; l++)
    {
        System.out.print(array[l]+" ");

    }

    System.out.println();
}

The problem I have is I don't know the differences between 我的问题是我不知道两者之间的区别

 <E extends Comparable<E>>

and

 <E extends Comparable>

They both work but I don't know the reason for the first one. 它们都可以工作,但是我不知道第一个原因。

E extends Comparable<E> means that an instance of E can be compared to other objects of type E . E extends Comparable<E>指的实例E可以与类型的其它对象E

E extends Comparable means that an instance of E can be compared to...something. E extends Comparable意味着可以将E的实例与...进行比较。 It's a raw type, which is bad. 这是原始类型,很糟糕。 Don't do that. 不要那样做

声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM