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Task: Build a Secure File Upload Component
Objective:
Create a reusable React component for secure file upload with the following features:

File Preview: Show a thumbnail preview for images and file icons for other types.

File Size Limit: Enforce a 10 MB file size limit with a clear error message.

Drag and Drop Support: Allow users to drag and drop files.

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version: 3.3

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Java Update alternatives

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Reload Nginx

nginx -s reload

validate Nginx

nginx -s reload

Reverse proxy config

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How to get docker-compose to always re-create containers from fresh images?

Purging All Unused or Dangling Images, Containers, Volumes, and Networks

$ docker system prune

Remove any stopped containers and all unused images

$ docker system prune -a

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create tar.gz file in Linux

tar -czvf file.tar.gz directory

Verification

$ tar -ztvf projects.tar.gz

extract a tar.gz compressed archive on Linux

$ tar -xvf file.tar.gz
$ tar -xzvf file.tar.gz

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package me.ff.jtest;

public class Test2 {

    static void solution(int n){

        String [] result = new String[n+1];

        for (int i=1;i<=n; i++){
            result[i] = "";

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import java.util.LinkedHashMap;
import java.util.Map;

public class MaxSizeHashMap<K, V> extends LinkedHashMap<K, V> {
    private final int maxSize;

    public MaxSizeHashMap(int maxSize) {
        super(maxSize);
        this.maxSize = maxSize;
    }

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ln -s

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var stream = {
    map: function (list, fn) {
        var newList = [];
        for (item in list) {
            var mappedItem = fn(list[item]);
            newList.push(mappedItem);
        }
        return newList;
    },
    filter: function (list, predicate) {