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Java设计模式

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罗祥 2019-12-05 15:34:06 +08:00
parent f1286d87ae
commit efc1088cc8
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14
code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/AddExpression.java Normal file
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package com.heibaiying.behavioral.interpreter;
import java.util.HashMap;
public class AddExpression extends SymbolExpression {
public AddExpression(Expression left, Expression right) {
super(left, right);
}
//把左右两个表达式运算的结果加起来
public int interpreter(HashMap<String, Integer> var) {
return super.left.interpreter(var) + super.right.interpreter(var);
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/Calculator.java Normal file
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package com.heibaiying.behavioral.interpreter;
import java.util.HashMap;
import java.util.Stack;
public class Calculator {
//定义表达式
private Expression expression;
//构造函数传参，并解析
public Calculator(String expStr) {
//定义一个栈，安排运算的先后顺序
Stack<Expression> stack = new Stack<>();
//表达式拆分为字符数组
char[] charArray = expStr.toCharArray();
//运算
Expression left;
Expression right;
for (int i = 0; i < charArray.length; i++) {
switch (charArray[i]) {
case '+': //加法
//加法结果放到栈中
left = stack.pop();
right = new VarExpression(String.valueOf(charArray[++i]));
stack.push(new AddExpression(left, right));
break;
case '-':
left = stack.pop();
right = new VarExpression(String.valueOf(charArray[++i]));
stack.push(new SubExpression(left, right));
break;
default: //公式中的变量
stack.push(new VarExpression(String.valueOf(charArray[i])));
}
}
//把运算结果抛出来
this.expression = stack.pop();
}
//开始运算
public int run(HashMap<String, Integer> var) {
return this.expression.interpreter(var);
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/Expression.java Normal file
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package com.heibaiying.behavioral.interpreter;
import java.util.HashMap;
public abstract class Expression {
//解析公式和数值，其中var中的key值是公式中的参数，value值是具体的数字
public abstract int interpreter(HashMap<String, Integer> var);
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/SubExpression.java Normal file
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package com.heibaiying.behavioral.interpreter;
import java.util.HashMap;
public class SubExpression extends SymbolExpression {
public SubExpression(Expression left,Expression right){
super(left,right);
}
//左右两个表达式相减
public int interpreter(HashMap<String, Integer> var) {
return super.left.interpreter(var) - super.right.interpreter(var);
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/SymbolExpression.java Normal file
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package com.heibaiying.behavioral.interpreter;
public abstract class SymbolExpression extends Expression {
protected Expression left;
protected Expression right;
//所有的解析公式都应只关心自己左右两个表达式的结果
public SymbolExpression(Expression left, Expression right) {
this.left = left;
this.right = right;
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/VarExpression.java Normal file
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package com.heibaiying.behavioral.interpreter;
import java.util.HashMap;
public class VarExpression extends Expression {
private String key;
public VarExpression(String key) {
this.key = key;
}
//从map中取之
public int interpreter(HashMap<String, Integer> var) {
return var.get(this.key);
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/interpreter/ZTest.java Normal file
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package com.heibaiying.behavioral.interpreter;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
public class ZTest {
//运行四则运算
public static void main(String[] args) throws IOException {
String expStr = getExpStr();
//赋值
HashMap<String, Integer> var = getValue(expStr);
Calculator cal = new Calculator(expStr);
System.out.println("运算结果为：" + expStr + "=" + cal.run(var));
}
//获得表达式
public static String getExpStr() throws IOException {
System.out.print("请输入表达式：");
return (new BufferedReader(new InputStreamReader(System.in))).readLine();
}
//获得值映射
public static HashMap<String, Integer> getValue(String exprStr) throws IOException {
HashMap<String, Integer> map = new HashMap<String, Integer>();
//解析有几个参数要传递
for (char ch : exprStr.toCharArray()) {
if (ch != '+' && ch != '-') {
//解决重复参数的问题
if (!map.containsKey(String.valueOf(ch))) {
String in = (new BufferedReader(new InputStreamReader(System.in))).readLine();
map.put(String.valueOf(ch), Integer.valueOf(in));
}
}
}
return map;
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/iterator/Book.java Normal file
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package com.heibaiying.behavioral.iterator;
import lombok.Data;
@Data
public class Book {
private String name;
public Book(String name) {
this.name = name;
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/iterator/BookIterator.java Normal file
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package com.heibaiying.behavioral.iterator;
import java.util.List;
public class BookIterator implements Iterator<Book> {
private List<Book> bookList;
private int position = 0;
public BookIterator(List<Book> bookList) {
this.bookList = bookList;
}
@Override
public Book next() {
return bookList.get(position++);
}
@Override
public boolean hasNext() {
return position < bookList.size();
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/iterator/Bookshelf.java Normal file
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package com.heibaiying.behavioral.iterator;
/**
* 书柜
*/
public interface Bookshelf {
void addBook(Book book);
void removeBook(Book book);
BookIterator iterator();
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/iterator/BookshelfImpl.java Normal file
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package com.heibaiying.behavioral.iterator;
import java.util.ArrayList;
import java.util.List;
/**
* 书柜
*/
public class BookshelfImpl implements Bookshelf {
private List<Book> bookList = new ArrayList<>();
@Override
public void addBook(Book book) {
bookList.add(book);
}
@Override
public void removeBook(Book book) {
bookList.remove(book);
}
@Override
public BookIterator iterator() {
return new BookIterator(bookList);
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/iterator/Iterator.java Normal file
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package com.heibaiying.behavioral.iterator;
public interface Iterator<E> {
E next();
boolean hasNext();
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/iterator/ZTest.java Normal file
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package com.heibaiying.behavioral.iterator;
public class ZTest {
public static void main(String[] args) {
BookshelfImpl bookshelf = new BookshelfImpl();
bookshelf.addBook(new Book("Java书籍"));
bookshelf.addBook(new Book("Python书籍"));
bookshelf.addBook(new Book("Go书籍"));
BookIterator iterator = bookshelf.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/observer/Business.java Normal file
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package com.heibaiying.behavioral.observer;
import java.util.ArrayList;
import java.util.List;
public class Business implements Observable {
private List<Observer> observerList = new ArrayList<>();
@Override
public void addObserver(Observer observer) {
observerList.add(observer);
}
@Override
public void removeObserver(Observer observer) {
observerList.remove(observer);
}
@Override
public void notifyObservers(String message) {
for (Observer observer : observerList) {
observer.receive(message);
}
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/observer/Observable.java Normal file
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package com.heibaiying.behavioral.observer;
public interface Observable {
void addObserver(Observer observer);
void removeObserver(Observer observer);
void notifyObservers(String message);
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/observer/Observer.java Normal file
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package com.heibaiying.behavioral.observer;
public interface Observer {
void receive(String message);
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/observer/User.java Normal file
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package com.heibaiying.behavioral.observer;
import lombok.Data;
@Data
public class User implements Observer {
private String name;
public User(String name) {
this.name = name;
}
@Override
public void receive(String message) {
System.out.println(getName() + "收到消息：" + message);
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/observer/ZTest.java Normal file
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package com.heibaiying.behavioral.observer;
public class ZTest {
public static void main(String[] args) {
Business business = new Business();
business.addObserver(new User("用户1"));
business.addObserver(new User("用户2"));
business.addObserver(new User("用户3"));
business.notifyObservers("商品促销通知");
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/strategy/BonusStrategy.java Normal file
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package com.heibaiying.behavioral.strategy;
public class BonusStrategy implements Strategy {
@Override
public void execute() {
System.out.println("奖金激励");
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/strategy/Company.java Normal file
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package com.heibaiying.behavioral.strategy;
public class Company {
private Strategy strategy;
public Company setStrategy(Strategy strategy) {
this.strategy = strategy;
return this;
}
public void execute() {
strategy.execute();
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/strategy/Strategy.java Normal file
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package com.heibaiying.behavioral.strategy;
public interface Strategy {
void execute();
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/strategy/TravelStrategy.java Normal file
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package com.heibaiying.behavioral.strategy;
public class TravelStrategy implements Strategy {
@Override
public void execute() {
System.out.println("集体旅游");
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/strategy/WorkOvertimeStrategy.java Normal file
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package com.heibaiying.behavioral.strategy;
public class WorkOvertimeStrategy implements Strategy {
@Override
public void execute() {
System.out.println("奖励加班");
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/strategy/ZTest.java Normal file
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package com.heibaiying.behavioral.strategy;
public class ZTest {
public static void main(String[] args) {
// 营业额
int turnover = Integer.parseInt(args[0]);
Company company = new Company();
if (turnover > 1000) {
company.setStrategy(new BonusStrategy()).execute();
} else if (turnover > 100) {
company.setStrategy(new TravelStrategy()).execute();
} else {
company.setStrategy(new WorkOvertimeStrategy()).execute();
}
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/template/OlderPhone.java Normal file
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package com.heibaiying.behavioral.template;
public class OlderPhone extends Phone {
@Override
boolean needAddNFC() {
return false;
}
@Override
void packaged() {
System.out.println("附赠一个手机壳");
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/template/Phone.java Normal file
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package com.heibaiying.behavioral.template;
public abstract class Phone {
public void assembling() {
adCamera();
addBattery();
if (needAddNFC()) {
addNFC();
}
packaged();
}
private void adCamera() {
System.out.println("组装摄像头");
}
private void addBattery() {
System.out.println("安装电池");
}
private void addNFC() {
System.out.println("增加NFC功能");
}
// 钩子方法
abstract boolean needAddNFC();
abstract void packaged();
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/template/SmartPhone.java Normal file
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package com.heibaiying.behavioral.template;
public class SmartPhone extends Phone {
@Override
boolean needAddNFC() {
return true;
}
@Override
void packaged() {
System.out.println("附赠耳机一副");
}
}

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code/Java/design-pattern/src/main/java/com/heibaiying/behavioral/template/ZTest.java Normal file
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package com.heibaiying.behavioral.template;
public class ZTest {
public static void main(String[] args) {
OlderPhone olderPhone = new OlderPhone();
olderPhone.assembling();
SmartPhone smartPhone = new SmartPhone();
smartPhone.assembling();
}
}