如何在不使用Java中的集合的情况下对数组列表进行排序 [英] How to do sorting in array list without using collections in Java

问题描述

ArrayList < Integer > arraylist = new ArrayList < Integer > ();

arraylist.add(10010);
arraylist.add(5);
arraylist.add(4);
arraylist.add(2);

for (int i = 0; i < arraylist.size(); i++) {

    for (int j = arraylist.size() - 1; j > i; j--) {
        if (arraylist.get(i) > arraylist.get(j)) {

            int tmp = arraylist.get(i);
            arraylist.get(i) = arraylist.get(i);
            arraylist.get(j) = tmp;

        }

    }

}
for (int i: arraylist) {
    System.out.println(i);
}

交换时出现错误，LHS应该是可变的.我明白. 设置方法在这里有效，但我不想使用. 有没有一种方法可以不使用set方法呢? 非常感谢您的帮助.

It is giving error while swapping, The LHS should be variable. I understand it. Set method works here but I do not want to use. Is there a way to do it without using set method? Help is really appreciated.

推荐答案

arraylist.get(i)= arraylist.get(i);
arraylist.get(j) =tmp;

您不能为方法调用分配值.正如编译器告诉您的那样，分配的左侧必须是变量.

You can't assign a value to a method call. As the compiler told you, the left hand side of an assignment must be a variable.

使用set方法:

arraylist.set(i,arraylist.get(j));
arraylist.set(j,tmp);

有没有不用set方法的方法吗?

Is there a way to do it without using set method?

不.除非您希望将ArrayList转换为数组，否则请对数组进行排序，然后使用排序后的数组更新ArrayList.

No. Unless you wish to convert your ArrayList to an array, sort the array, and update the ArrayList with the sorted array.

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