定义一个小计算器类

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class Calculate{
//加法运算
/*
int add(int number1, int number2){ //在这里定义的参数称为“形参”。形参属于局部变量。
  int result = number1 + number2;

  return result;
}*/

int add(int... numbers){ //使用可变参数
  //System.out.println(numbers.length);
  int result = 0;
  for(int i=0;i<numbers.length;i++){
   result = result + numbers[i];
  }

return result;
}

//对两个整数值进行交换
void swap(int number1, int number2){
  int temp;
  temp = number1;
  number1 = number2;
  number2 = temp;
}

void swap(int[] numbers){
  int temp;
  temp = numbers[0];
  numbers[0] = numbers[1];
  numbers[1] = temp;
}
}

public class Demo4{
public static void main(String[] args){
//int a = 3, b = 5;

  Calculate cal = new Calculate();

  //cal.add();
  System.out.println(cal.add());
  System.out.println(cal.add(1));
  System.out.println(cal.add(1,1));
  System.out.println(cal.add(1,1,1));

  //int addResult = cal.add(a, b); //这里传进去的a和b称为”实参“
  //System.out.println(addResult); //输出结果：8
  //System.out.println(a);
  /*
  System.out.println("交换方法调用前：a=" + a + ",b=" + b); //a=3,b=5
  cal.swap(a,b);
  System.out.println("交换方法调用后：a=" + a + ",b=" + b); //a=5,b=3
  */
  /*
  int[] intArray = {3, 5};
  System.out.println("交换方法调用前：" + intArray[0] + "," + intArray[1]);
  cal.swap(intArray);
  System.out.println("交换方法调用后：" + intArray[0] + "," + intArray[1]);
  */
}
}

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