从 int 数组中删除所有大于 100 的值

Question

给定一个整数列表 1,2,3 等。删除所有大于 100 的值？这个的JAVA代码是什么？import java.util.ArrayList;import java.util.List;public class Main {public static void main(String[] args) {    int[] given_list = {0,4,5,56,3, 2000, 453,};    }}

Answer 1

我告诉你最简单的方法...

List<Integer> given_list  = new ArrayList<>(Arrays.asList(new Integer[] {0,4,5,56,3, 2000, 453}));

given_list.removeIf(element -> element > 100);

System.out.println(given_list);

Answer 2

使用 Java 8 Stream API，这可以通过一行代码来实现：

Arrays.stream(given_list).filter(x -> x<100).toArray()

上面的代码行创建了一个新数组，并且不修改原始数组。

Answer 3

import java.util.ArrayList;

import java.util.List;

public class DeleteFromList {

public static void main(String[] args) {

   int[] given_list = {0,4,5,56,3, 2000,8,345, 453,}; 

   //since there is no direct way to delete an element from the array we have to use something other than array, like a list.

   List<Integer> list = new ArrayList<Integer>();

   //this changes the whole array to list

   for (int i : given_list){

      list.add(i);

   }

   //this iterates through the list and check each element if its greater then 100

   for(int i=0;i<list.size();i++){

      if(list.get(i) > 100){

         list.remove(i);

         i--;     // this is because everytime we delete an element, the next comes in place of it so we need to check new element.

      }

   }

   //print out the new list which has all the elements which are less than 100

   System.out.println(list);

   }

}

由于无法从数组中删除元素，因此我们必须将数组更改为列表，然后对该列表进行操作，以便我们可以根据需要删除元素。