I have a String array contains name, age, and gender of 10 customers. I tried to convert it to Customer array. I tried to copy each elements of String array into Customer array but it's not compatible.
How do I insert elements from String array into Customer array?
//String[] customerData is given but too long to copy
Customer[] custs = new Customer[numberOfCustomer];
for (int x = 0; x < customerData.length; x++) {
custs[x] = customerData[x];
}
Assuming that Customer class has an all-args constructor Customer(String name, int age, String gender) and the input array contains all the fields like:
String[] data = {
"Name1", "25", "Male",
"Name2", "33", "Female",
// ...
};
The array of customers may be created and populated like this:
Customer[] customers = new Customer[data.length / 3];
for (int i = 0, j = 0; i < customers.length && j < data.length; i++, j += 3) {
customers[i] = new Customer(data[j], Integer.parseInt(data[j + 1]), data[j + 2]);
}
Create a temporary customer object inside the loop and populate it with the data. Then assign custs[x] to the temporary object.
If you have a 2d array of strings and an all-args constructor in the Customer class, then you can convert an array of strings to an array of objects like this:
static class Customer {
String name, age, gender;
public Customer(String name, String age, String gender) {
this.name = name;
this.age = age;
this.gender = gender;
}
@Override
public String toString() {
return name + " " + age + " " + gender;
}
}
public static void main(String[] args) {
String[][] arrStr = {
{"John1", "22", "Male"},
{"John2", "21", "Male"},
{"John3", "23", "Male"},
{"John4", "24", "Male"},
{"John5", "20", "Male"}};
Customer[] customers = Arrays.stream(arrStr)
// convert an array of strings to an array of objects
.map(arr -> new Customer(arr[0], arr[1], arr[2]))
.toArray(Customer[]::new);
// output
Arrays.stream(customers).forEach(System.out::println);
}
Output:
John1 22 Male
John2 21 Male
John3 23 Male
John4 24 Male
John5 20 Male
You have json string , use objectMapper to convert json string to object.
