why use classes in java

public class HelloWorld { public static void main(String[] args) { class Number{ int number; public boolean isPos(){ if(number > 0){ return true; } else { return false; } } } Number myNumber = new Number(); myNumber.number = 7; if(myNumber.isPos()){ System.out.println(myNumber.number + " is positive!!!"); } else { System.out.println(myNumber.number + " is not positive!!!"); } } }

java classes

public class Bicycle {
        
    // the Bicycle class has
    // three fields
    public int cadence;
    public int gear;
    public int speed;
        
    // the Bicycle class has
    // one constructor
    public Bicycle(int startCadence, int startSpeed, int startGear) {
        gear = startGear;
        cadence = startCadence;
        speed = startSpeed;
    }
        
    // the Bicycle class has
    // four methods
    public void setCadence(int newValue) {
        cadence = newValue;
    }
        
    public void setGear(int newValue) {
        gear = newValue;
    }
        
    public void applyBrake(int decrement) {
        speed -= decrement;
    }
        
    public void speedUp(int increment) {
        speed += increment;
    }
        
}

Posted by: Guest on July-07-2021

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