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TestValueOf.java

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package symjava.test;

public class TestValueOf {

public static class Car {

public int id;

public Car(int id) {

this.id = id;

}

public Car add(Car c) {

return new Car(this.id+c.id);

}

}

public static class Jeep extends Car {

public Jeep(int id) {

super(id);

}

public static Jeep valueOf(Car c) {

return new Jeep(c.id);

}

}

public static void main(String[] args) {

Car c1 = new Car(1);

Car c2 = new Car(10);

Car c12 = c1 + c2;

//Jeep j = c12; //works

//Jeep j = Jeep.valueOf(c1 + c2); //works

Jeep j = c1 + c2;

System.out.println(j.id);

}

}