Incremento y decremento Opción 2: https://es.stackoverflow.com/q/530544/29967, Java

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//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        Counter countermain = new Counter();

System.out.println("give me a number");
        int number = 1;//in.nextInt();
        
        countermain.setCounter(number);

System.out.println(countermain.getCounter());

countermain.increase();
        System.out.println(countermain.getCounter());

countermain.decrease();
        System.out.println(countermain.getCounter());
        
        countermain.decrease();
        System.out.println(countermain.getCounter());
        
        countermain.decrease();
        System.out.println(countermain.getCounter());
    }
}

class Counter {

private int counter = 0;
    static int decision;

public Counter() {

}

public Counter(int counter) {
        this.counter = counter;

}

public int getCounter() {
        return counter;
    }

public void setCounter(int counter) {
        this.counter = counter;
    }

public void increase() {
        if(counter  >= 0 ) {
         counter++;

}

public void decrease() {
        if (counter > 0) {
          counter--;
        }
    }

}

[ + ] Show input
Compilation time: 1.03 sec, absolute running time: 0.21 sec, cpu time: 0.13 sec, memory peak: 34 Mb, absolute service time: 1,41 sec

Incremento y decremento Opción 2: https://es.stackoverflow.com/q/53054...