如何从 java 数组中删除字符串

Question

How can I delete the foodname "Hotdog" from the array if appeared?

import java.util.Scanner;
import java.util.Arrays;
class Main {
  public static void main(String[] args)  {
    Scanner input =new Scanner(System.in);
  System.out.println ("Enter num of food: ");
    int n = input.nextInt();
    
  while (n>10){
    System.out.println("Wrog");
    n = input.nextInt();
  }
    String name[] = new String[n];
  System.out.println ("Enter food name: "); 

    for (int i=0;i<name.length;i++){
      name[i] = input.next();
      String inp= "hotdog";
      if(Arrays.asList(name).contains(inp)){
        System.out.println ("Not valid"); 
      }
    }
      for (int i=0;i<name.length;i++){
      System.out.println(name[i]);
    }
}
}

I want to delete foodname that matches hotdog. Also I want to remove array length.

Answer 1

You can use the ArrayList class to remove elements from the array. Here's an example of how you can modify your code to delete "hotdog" from the array if it appears:

import java.util.Scanner;
import java.util.Arrays;
import java.util.ArrayList;

class Main {
  public static void main(String[] args)  {
    Scanner input =new Scanner(System.in);
    System.out.println ("Enter num of food: ");
    int n = input.nextInt();
    
    while (n>10){
      System.out.println("Wrog");
      n = input.nextInt();
    }

    ArrayList<String> name = new ArrayList<String>();
    System.out.println ("Enter food name: "); 

    for (int i=0;i<n;i++){
      String inp = input.next();
      if(inp.equalsIgnoreCase("hotdog")){
        System.out.println ("Not valid"); 
      } else{
        name.add(inp);
      }
    }
    for (int i=0;i<name.size();i++){
      System.out.println(name.get(i));
    }
  }
}

In this code, instead of using an array to store the names, I am using an ArrayList. The ArrayList has a built-in method called "remove" that can be used to delete elements from the list.

Also, I have removed the array length since ArrayList handles the size dynamically.

NOTE: Code is not tested. Your question wasn't 100% clear to me.