Interface-calculator and interface Calculator

Interface-calculator and interface Calculator

Using Interfaces for parameters, write a calculator to complete +-*/operations

(1) define an interface Compute containing a method int computer (int n, int m );

(2) design four classes to implement this interface respectively and complete the +-*/Operation

(3) Design a class UseCompute with the following methods: public void useCom (Compute com, int one, int two)

This method requires that: 1. Use the passed object to call the computer Method to complete the operation. 2. output the operation result.

(4) Design a test class and call the useCom method in UseCompute to complete the +-*/operation.

1 public interface Compute {2     3     int computer(int m,int n);4 5 }

1 public class Add implements Compute {2 3     @Override4     public int computer(int m, int n) {5         6         return m+n;7     }8 9 }

1 public class Subtract implements Compute {2     3     @Override4     public int computer(int m, int n){5         6         return m-n;7     }8 9 }

1 public class Cheng implements Compute {2     3     @Override4     public int computer(int m, int n){5         6         return m*n;7     }8 9 }

1 public class Chu implements Compute {2 3     @Override4     public int computer(int m, int n) {5         6         return m/n;7     }8 9 }

1 public class UseCompute {2 public void useCom (Compute com, int one, int two) {3 4 com. computer (one, two); 5 System. out. println ("result =" + com. computer (one, two); 6 7} 8 9 public static void main (String [] args) {10 11 UseCompute jsq = new UseCompute (); 12 // Add 13 Add a = new Add (); 14 jsq. useCom (a, 150, 33); 15 // minus 16 Subtract B = new Subtract (); 17 jsq. useCom (B, 150, 33); 18 // multiply 19 Cheng c1 = new Cheng (); 20 jsq. useCom (c1, 150, 33); 21 // except 22 Chu c2 = new Chu (); 23 jsq. useCom (c2, 150, 33); 24} 25}

Result: