-----------------------------------com.example.Example.java-----------------------------------

package com.example;

import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Example {

    @SerializedName("result")
    @Expose
    private List<Result> result = null;

    public List<Result> getResult() {
    return result;
    }

    public void setResult(List<Result> result) {
    this.result = result;
    }

}
-----------------------------------com.example.Result.java-----------------------------------

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Result {

@SerializedName("Users")
@Expose
private Users users;

public Users getUsers() {
return users;
}

public void setUsers(Users users) {
this.users = users;
}

}
-----------------------------------com.example.Users.java-----------------------------------

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Users {

@SerializedName("id")
@Expose
private String id;
@SerializedName("user_name")
@Expose
private String userName;
@SerializedName("user_password")
@Expose
private String userPassword;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName;
}

public String getUserPassword() {
return userPassword;
}

public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}

}