public class Main {//定义主类
public static int addition(int a, int b) {//定义加法类
int sum;
sum = a + b;
return sum;
} // 加法类
public int subtraction(int a, int b) {//定义减法类
return a - b;
} // 减法类
public int cf(int a, int b) {//定义乘法类(cf)
return a * b;
} // 减法类
public static void main(String[lbk][rbk] args) {//调用加法类
System.out.println("10+5 和为： " + addition(10, 5));
// Main calculator = new Main();//新的调用方法定义.
/*System.out.println(calculator.subtraction(20, 10));
System.out.println(calculator.subtraction(40, 40));
System.out.println(calculator.subtraction(60, 80));
*/
System.out.println("20+10 和为： " + addition(20, 10));
Main calculator = new Main();//新的调用方法定义.
System.out.println("60*80 积为： " + calculator.cf(60, 80));
Main cacf = new Main();//新的调用方法定义.
System.out.println("60-80 差为： " + cacf.subtraction(60, 80));
}
}