Encapsulation Interview Questions

Which of the following statements is true about encapsulation?

What will be printed?

class Person {
    private String name;
    public void setName(String n) { name = n; }
    public String getName() { return name; }
}
public class Main {
    public static void main(String[] args) {
        Person p = new Person();
        p.setName("Alice");
        System.out.println(p.getName());
    }
}

Why are private access modifiers important in encapsulation?

How can you make a class property read-only?

class Demo {
    private int value;
    public int getValue() { return value; }
}

Which statement is correct?

What will be printed?

class Counter {
    private int count = 0;
    public void increment() { count++; }
    public int getCount() { return count; }
}
public class Main {
    public static void main(String[] args) {
        Counter c1 = new Counter();
        Counter c2 = new Counter();
        c1.increment();
        System.out.println(c2.getCount());
    }
}

Which is true?

Which is correct for validating input using encapsulation?

class Account {
    private int balance;
    public void setBalance(int b) { if(b >= 0) balance = b; }
    public int getBalance() { return balance; }
}

Which of the following is not a benefit of encapsulation?

Which statement about encapsulation is correct?