How can you change the value declared with a private access level?

In Java, to change the value of a field with private access level, access methods — getters and setters — are usually used. Direct access to a private field from another class is impossible.

Example:

public class MyClass {
    private int value;

    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }
}

// Usage:
MyClass obj = new MyClass();
obj.setValue(10);  // changing private field via setter
int val = obj.getValue();  // getting value via getter

If for some reason getters/setters cannot be used, the value can be changed via reflection, but this is not recommended as it breaks encapsulation and can lead to errors.