数组包含多个最后一个值

Question

I'm recently having an issue with adding values to an array.
The array contains only multiple last values added.
I was looking on Stack Overflow but all answers said either that a static field is used or there is the same object. But none of these are my case.

Here's my code:

Main class:

public class Main {

    public static void main(String[] args) {
        Foo[] FooColection = new Foo[5];
        for (int i = 0; i < 5; i++) {
            Foo Bar = new Foo(i);//making a new Object everytime
            FooColection[i] = Bar;
            for (int j = 0; j < i;j++ ) {
                System.out.println(FooColection[i].getValue());
            }
        }
    }
}

Foo class:

public class Foo {

    private int value;//non-static field

    public Foo(int value) {
        this.value = value;
    }

    public void change(int newVal) {
        this.value = newVal;
    }

    public int getValue() {
        return value;
    }
}

Output:

1
2
2
3
3
3
4
4
4
4

Answer 1

You are printing objects that many times. It is in j loop and you're printing with respect to i

System.out.println(FooColection[i].getValue());

You should remove that j loop as your Foo is not a collection, it's a single object.

Answer 2

There's nothing wrong with your array. Just remove the j loop and you're good.

public class Main {

    public static void main(String[] args) {
        Foo[] FooColection = new Foo[5];
        for (int i = 0; i < 5; i++) {
            Foo Bar = new Foo(i);//making a new Object everytime
            FooColection[i] = Bar;
            System.out.println(FooColection[i].getValue());
            }
        }
    }
}

Output

1
2
3
4

Answer 3

This behaviour is because of your nested loop, nothing else. Consider removing the nested loop and just print as you iterate.