设计模式

模板方法模式

所有重复的代码都应该上升到父类去.
当我们要完成在某一细节层次一致的一个过程或一系列步骤,但其个别步骤在更详细的层次上的实现可能不同时,我们通常考虑用模板方法模式来处理.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
package template.method;

/**
 * Created by hero on 17-2-18.
 */
public abstract class TestPaper {
    public void testQuestion1() {
        System.out.println("小明是男是女?");
        System.out.println("答案是: " + answer1());
    }

    public void testQuestion2() {
        System.out.println("川普会被暗杀吗?");
        System.out.println("答案是: " + answer2());
    }

    public abstract String answer1();

    public abstract String answer2();
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
package template.method;

/**
 * Created by hero on 17-2-18.
 */
public class TestPaperA extends TestPaper {
    public String answer1() {
        return "随便";
    }

    public String answer2() {
        return "可能";
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
package template.method;

/**
 * Created by hero on 17-2-18.
 */
public class TestPaperB extends TestPaper {
    public String answer1() {
        return "男的啊";
    }

    public String answer2() {
        return "不会";
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
package template.method;

/**
 * Created by hero on 17-2-18.
 */
public class Main {
    public static void main(String[] args) {
        TestPaper tp1 = new TestPaperA();
        TestPaper tp2 = new TestPaperB();

        tp1.testQuestion1();
        tp1.testQuestion2();

        tp2.testQuestion1();
        tp2.testQuestion2();
    }
}