how to set the values of one constructor with the values of another? [duplicate]

Question

I'm currently in a beginner java course at my university and am still learning the basics of programming. This week we've been learning about constructors, and I'm stuck on the second half of my assignment for this week so any help would be much appreciated.

the directions for the second part of the lab(the part i'm stuck on) are as follows:

Write the complete code for the class Truck as given in the class diagram below. Be sure to not use duplicate code in the constructors. For example, the constructors with 2 arguments should call the one with 1 argument to set the value for cylinder.

these are the constructors it wants me to make.

Truck()
Truck(int cylinders)
Truck(int cylinders, String manufacturer)
Truck(int cylinders, String manufacturer, double load)
Truck(int cylinders, String manufacturer, double load, double tow)

Any explanations/examples as to how to do this would be amazing

i was going to close this as a duplicate of How to avoid constructor code redundancy in Java — Nathan Hughes
– Nathan Hughes, Commented Sep 29, 2015 at 17:46

vivek · Accepted Answer · 2015-09-29 17:42:53Z

3

You can use this() to invoke another constructor. For eg:

Truck(A a){
    ...
}
Truck(A a,B b){
    this(a);
    ...
    ...
}

edited Sep 29, 2015 at 17:42

user180100

answered Sep 29, 2015 at 17:42

vivek

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1 Comment

Suresh Atta Over a year ago

or else google Constructor overloading and constructor chaining in Java

Community · Accepted Answer · 2017-05-23 10:27:00Z

0

just read a simple Oracle manual:

https://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html or read stackoverflow.com more careful

public class Rectangle {
    private int x, y;
    private int width, height;

    public Rectangle() {
        this(0, 0, 1, 1);
    }
    public Rectangle(int width, int height) {
        this(0, 0, width, height);
    }
    public Rectangle(int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }
    ...
}

edited May 23, 2017 at 10:27

CommunityBot

11 silver badge

answered Sep 29, 2015 at 17:44

Vyacheslav

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2 Comments

skulltula Over a year ago

Excellent, this helped me out alot! I knew i was supposed to be doing something with this() but i wasnt sure what, having a complete example was what I needed.

Vyacheslav Over a year ago

@skulltula,have a nice day

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