Final answer:
We can access and assign values to instance variables from outside a class by using public methods, also known as getters and setters.
Step-by-step explanation:
Instance variables in a class are usually declared as private, which means they can only be accessed and modified within the class itself. However, we can provide public methods, also known as getters and setters, to access and assign values to these instance variables from outside the class.
For example, let's say we have a class called Person with a private instance variable called age:
public class Person {
private int age;
public void setAge(int age) {
this.age = age;
}
public int getAge() {
return age;
}
}
In this case, we can use the setAge() method to assign a value to the age variable and the getAge() method to retrieve the value of the age variable from outside the class.