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Counter static

Learning Outcome. A static variable is shared across many instances.

  1. Write classes call CounterStatic.java and CounterStaticTest.java. Run and observe the outcome.
CounterStatic
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package com.ait.ex5A;

public class CounterStatic {
    private static int count;

    public CounterStatic() {
        count++;
    }

    public int getCount() {
        return count;
    }

    public static int getCounter() {
        return count;
    }
}
CounterStaticTest
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package com.ait.ex5A;

public class CounterStaticTest {

    public static void main(String[] args) {
        CounterStatic counter1 = new CounterStatic();
        CounterStatic counter2 = new CounterStatic();
        CounterStatic counter3 = new CounterStatic();
        System.out.println(counter1.getCount());
        System.out.println(counter2.getCount());
        System.out.println(counter3.getCount());

        System.out.println(CounterStatic.getCounter());
    }
}

Console Output:

3
3
3
3

CounterStatic.java
CounterStaticTest.java