How To Read From Text File Using HashMap For Category And Descriptors

I have a TxT file with the next content:

[Cars]
BMW=3
Lamborghini=10
[Computers]
Mouse=5
Keyboard=12

How can i read the file and output in

System.out.println("Category " + descriptor + " Value: " + )

The output console should look like :

Cars : Lamborghini 10
BMW 3
Computers: Mouse 5
Keyboard 12

And the Value MUST be readed from thext file for each descriptor.

package test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Objects;
import java.util.Map;
public class Descriptor {
private final String descriptor;

[Code] ....