Java error @d622e5

Question

class Tank{
    int level;
}
class aliasing{
    public static void main(String args[]){
        Tank t1 = new Tank();
        Tank t2 = new Tank();

        t1.level=21;
        t2.level=32;
        System.out.println("t1: " + t1 + " t2: " + t2);
    }
}

This block of code produces the output: t1: Tank@1b4b24d t2: Tank@260829. Obviously this is wrong, but i don't know why all of a sudden all my code is producing nosense. Also, if i just intiliaze a primitive value i can print that out no problem with the correct value, so i don't know why only objects are messing up.

What output do you expect and why? – Sotirios Delimanolis Nov 03 '14 at 19:22 — Sotirios Delimanolis, Nov 03 '14 at 19:22

score 1 · Answer 1 · answered Nov 03 '14 at 19:23

1

You need to override the toString() method in Tank class to produce meaningful representation of your object.

answered Nov 03 '14 at 19:23

Kakarot

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score 0 · Answer 2 · answered Nov 03 '14 at 19:25

It is printing the correct output. As can be seen in Object.toString() documentation, the default is to print the name of the class, an @ character and the hash of the specific object.

The hashes both differ as they are two different objects. If you were to set t1 = t2 = new Tank(); then you would see the hashes match up as well.

Java error @d622e5

2 Answers2