Java 2D Collisions

So basically I have a rectangle that i need to collide with two objects i have some crappy code written for the collisions but i needed assistance so im asking the internet here is the code.

package dev.codeon.movementtesting.assets;

import java.awt.Graphics;
import java.util.ArrayList;

import dev.codeon.movementtesting.input.Input;

public class Player extends Entity {

private ArrayList<Entity> entities;

public boolean canUp = true;
public boolean canDown = true;
public boolean canLeft = true;
public boolean canRight = true;

public int speed = 1;

public Player(ArrayList<Entity> entities, String id) {
    this.id = id;
    this.entities = entities;
}

public void tick() {
    checkDirection();

    if(canUp && Input.up) {
        y -= speed;
    } 
    if(canLeft && Input.left) {
        x -= speed;
    }
    if(canDown && Input.down) {
        y += speed;
    }
    if(canRight && Input.right) {
        x += speed;
    }
}

public void render(Graphics g) {
    g.drawRect(x - (width / 2), y - (height / 2), width, height);
}

public void checkDirection() {
    for(int i = 0; i < entities.size(); i++) {
        Entity temp = entities.get(i);
        if(temp.id != id) {

            if((x > temp.x + (temp.x / 2) && x < temp.x - (temp.x / 2))) {
                canDown = true;
            } else {
                canDown = false;
                System.out.println("false");
            }


            if() {
                canLeft = true;
            } else {
                canLeft = false;
            }
            if((temp.x - (temp.width / 2) > x + (width / 2)) || temp.y + (height / 2) < y) {
                canRight = true;
            } else {
                canRight = false;
            }
            if(temp.y + (temp.height / 2) < y - (height / 2)) {
                canUp = true;
            } else {
                canUp = false;
            }
            if(temp.y - (temp.height / 2) > y + (height / 2) || temp.x - (width / 2) > x) {
                canDown = true;
            } else {
                canDown = false;
            }
        }
    }
}

}

I want it to not move up down left or right based on the collisions, canUp and so on i would like nice answers if you need something else please ask ill be here for three hours thank you