OOPS.java

// Encapsulation

public class OOPS {
    public static void main(String[] args) {
        Pen p1 = new Pen();
        p1.setColor("Blue");
        System.err.println(p1.getColor());
        p1.setTip(5);
        System.out.println(p1.getTip());
        p1.setColor("Yellow");
        System.out.println(p1.getColor());
    }
}

class BankAccount{
    public String username;
    private String password;
    public void setPassword(String pwd){
        password = pwd;
    }
}

class Pen{
    private String color;
    private int tip;

    String getColor() {
        return this.color;
    }

    int getTip() {
        return this.tip;
    }

    void setColor(String newColor){
        this.color = newColor;
    }

    void setTip(int tip){
        this.tip = tip;
    }
}

class Student {
    String name;
    int age;
    float percentage;      // CGPA
    void calcPercentage(int phy,int chem, int math) {
        percentage = (phy + chem + math)/3;
    }
}