1、介绍

Template Method模式：在父类中定义处理流程的框架，在子类中实现具体处理的模式。

2、例子类图

Template Method

3、代码例子

AbstractDisplay：抽象模板类

package me.jtzen9.template_method;public abstract class AbstractDisplay {    public abstract void open();    public abstract void print();    public abstract void close();    public final void display() {        open();        for (int i = 0; i < 5; i++) {            print();        }        close();    }}

CharDisplay：具体实现类

package me.jtzen9.template_method;public class CharDisplay extends AbstractDisplay {    private char ch;    public CharDisplay(char ch) {        this.ch = ch;    }    @Override    public void open() {        System.out.println("<<");    }    @Override    public void print() {        System.out.println(ch);    }    @Override    public void close() {        System.out.println(">>");    }}

StringDisplay：具体实现类

package me.jtzen9.template_method;public class StringDisplay extends AbstractDisplay {    private String string;    private int width;    public StringDisplay(String string) {        this.string = string;        this.width = string.getBytes().length;    }    @Override    public void open() {        printLine();    }    @Override    public void print() {        System.out.println("|" + string + "|");    }    @Override    public void close() {        printLine();    }    private void printLine(){        System.out.print("+");        for (int i = 0; i < width; i++) {            System.out.print("-");        }        System.out.println("+");    }}

测试代码：

package me.jtzen9.template_method;public class Main {    public static void main(String[] args) {        AbstractDisplay d1 = new CharDisplay('H');        AbstractDisplay d2 = new StringDisplay("Hello,world.");        d1.display();        d2.display();    }}