java 介面做實參
阿新 • • 發佈:2018-12-13
文章目錄
題目
利用介面做引數,寫個計算器,能完成±*/運算
(1)定義一個介面Compute含有一個方法int computer(int n,int m);
(2)設計四個類分別實現此介面,完成±*/運算
(3)設計一個類UseCompute,含有方法:
public void useCom(Compute com, int one, int two)
此方法要求能夠:
- 用傳遞過來的物件呼叫computer方法完成運算
- 輸出運算的結果
(4)設計一個測試類,呼叫UseCompute中的方法useCom來完成±*/運算
實現
public interface Compute { int computer(int n,int m); } public class Jia implements Compute { @Override public int computer(int n, int m) { return n+m; } } public class Jian implements Compute { @Override public int computer(int n, int m) { return n-m; } } public class Cheng implements Compute { @Override public int computer(int n, int m) { return n*m; } } public class Chu implements Compute { @Override public int computer(int n, int m) { return n/m; } } public class UseCompute { //介面作為引數 public void useCom(Compute com, int one, int two) { System.out.println(com.computer(one, two)); } } public class TestCeshi { public static void main(String[] args) { UseCompute a =new UseCompute(); //實參傳具體介面的實現 a.useCom(new Jia(), 2, 2); a.useCom(new Jian(), 2, 2); a.useCom(new Cheng(), 2, 2); a.useCom(new Chu(), 2, 2); Compute aa =new Jia(); System.out.println(aa.computer(3,5)); } }