Java設計模式之模板模式(Template )

拋磚引玉

摘自:《大話設計模式》java

重複=易錯+難改

學生張三抄的試卷設計模式

public class ZhangSanPaper {

	public void test1(){ //試題1
		System.out.println("不屬於java關鍵字: A.int B.user C.static D.public");
		System.out.println("答案:b");
	}
	
	public void test2(){ //試題2
		System.out.println("console.log(false == '0');console.log(false === '0');console.log(false == 'false');輸出結果爲 "
				+ " A.true false fasle B.false fasle true C.false true  fasle D.flale false fasle");
		System.out.println("答案:a");	
	}
	
	public void test3(){ //試題3
		System.out.println("使用Java語言編寫的源程序保存時的文件擴展名是( )。(A).class (B).java (C).cpp (D).txt");
		System.out.println("答案:b");	
	}
}

李四抄的試卷ide

public class LiSiPaper {

	public void test1(){ //試題1
		System.out.println("不屬於java關鍵字: A.int B.user C.static D.public");
		System.out.println("答案:c");
	}
	
	public void test2(){ //試題2
		System.out.println("console.log(false == '0');console.log(false === '0');console.log(false == 'false');輸出結果爲 "
				+ " A.true false fasle B.false fasle true C.false true  fasle D.flale false fasle");
		System.out.println("答案:b");	
	}
	
	public void test3(){ //試題3
		System.out.println("使用Java語言編寫的源程序保存時的文件擴展名是( )。(A).class (B).java (C).cpp (D).txt");
		System.out.println("答案:a");	
	}
}

測試測試

package moban.shejimoshi.test02;

public class Test {

	public static void main(String[] args) {
		System.out.println("學生張三抄的試卷");
		ZhangSanPaper zhangSanPaper = new ZhangSanPaper();
		zhangSanPaper.test1();
		zhangSanPaper.test2();
		zhangSanPaper.test3();
		
		System.out.println("=======================================");
		
		System.out.println("學生李四抄的試卷");
		LiSiPaper liSiPaper = new LiSiPaper();
		liSiPaper.test1();
		liSiPaper.test2();
		liSiPaper.test3();
	}
}

提煉代碼

試卷父類代碼spa

public class TestPaper {

	public void test1(){ //試題1
		System.out.println("不屬於java關鍵字: A.int B.user C.static D.public");
	}
	
	public void test2(){ //試題2
		System.out.println("console.log(false == '0');console.log(false === '0');console.log(false == 'false');輸出結果爲 "
				+ " A.true false fasle B.false fasle true C.false true  fasle D.flale false fasle");
	}
	
	public void test3(){ //試題3
		System.out.println("使用Java語言編寫的源程序保存時的文件擴展名是( )。(A).class (B).java (C).cpp (D).txt");
	}
	
}

學生張三抄的試卷.net

package moban.shejimoshi.test03;

public class ZhangSanPaper extends TestPaper{

	@Override
	public void test1(){ //試題1
		super.test1();
		System.out.println("答案:b");
	}
	
	@Override
	public void test2(){ //試題2
		super.test2();
		System.out.println("答案:a");	
	}
	
	@Override
	public void test3(){ //試題3
		super.test3();
		System.out.println("答案:a");	
	}
}

李四抄的試卷設計

package moban.shejimoshi.test03;

public class LiSiPaper extends TestPaper{

	@Override
	public void test1(){ //試題1
		super.test1();
		System.out.println("答案:c");
	}
	
	@Override
	public void test2(){ //試題2
		super.test2();
		System.out.println("答案:b");	
	}
	
	@Override
	public void test3(){ //試題3
		super.test3();
		System.out.println("答案:c");	
	}
}

測試代碼略code

父類代碼blog

package moban.shejimoshi;

public class TestPaper {

	public void test1(){ //試題1
		System.out.println("不屬於java關鍵字: A.int B.user C.static D.public");
		System.out.println("答案:"+answer1());
	}
	
	public void test2(){ //試題2
		System.out.println("console.log(false == '0');console.log(false === '0');console.log(false == 'false');輸出結果爲 "
				+ " A.true false fasle B.false fasle true C.false true  fasle D.flale false fasle");
		System.out.println("答案:"+answer2());	
	}
	
	public void test3(){ //試題3
		System.out.println("使用Java語言編寫的源程序保存時的文件擴展名是( )。(A).class (B).java (C).cpp (D).txt 2");
		System.out.println("答案:"+answer3());	
	}
	
	public String answer1() {
		return "";
	}
	public String answer2() {
		return "";
	}
	public String answer3() {
		return "";
	}
}

張三get

public class ZhangSanPaper extends TestPaper {

	@Override
	public String answer1() {
		return "a";
	}
	@Override
	public String answer2() {
		return "b";
	}
	@Override
	public String answer3() {
		return "b";
	}
}

李四

public class LiSiPaper extends TestPaper {

	@Override
	public String answer1() {
		return "b";
	}
	@Override
	public String answer2() {
		return "a";
	}
	@Override
	public String answer3() {
		return "d";
	}
}

測試代碼略

UML圖

下一篇更精彩: Java設計模式之模板模式(Template )第二篇

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