calculator.java

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package math;

public class Calculator {
  int a = 0, b = 0;
  
  public Calculator(){
    a = 6;
    b = 7;
    System.out.println(a + " + " + b + " = " + add(a, b));
  }

  public static void main(String[] args) {
    new Calculator();
  }

  public int add(int a, int b){
    return a + b;
  }

}