GsonReadArray.java

package com.zetcode;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;

class User {
    
    private final String firstName;
    private final String lastName;

    public User(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    @Override
    public String toString() {
        return new StringBuilder().append("{User").append("First name: ")
                .append(firstName).append(", Last name: ")
                .append(lastName).append("}").toString();
    }
}

public class GsonReadArray {
    
    public static void main(String[] args) throws IOException {
        
        Gson gson = new GsonBuilder().create();
        
        String fileName = "src/main/resources/users.json";
        Path path = new File(fileName).toPath();
        
        try (Reader reader = Files.newBufferedReader(path, 
                StandardCharsets.UTF_8)) {
            
            User[] users = gson.fromJson(reader, User[].class);
            
            Arrays.stream(users).forEach( e -> {
                System.out.println(e);
            });
        }
    }
}