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Java 遍历地图
在地图上迭代
实例源码：
源代码：
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import java.util.HashMap;3
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import java.util.Iterator;// 来自 时代Java5
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import java.util.List;7
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import java.util.Map;9
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public class Main implements Iterable<Stock> {12
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Map<String, Stock> portfolio = new HashMap<>();15
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public void add(Stock stock) {18
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portfolio.put(stock.getSymbol(), stock);20
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}22
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public void add(List<Stock> stocks) {25
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for (Stock s : stocks) {27
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portfolio.put(s.getSymbol(), s);//n o w j a v a . c o m - 时 代 Java 提 供29
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}31
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}33
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@Override36
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public Iterator<Stock> iterator() {38
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return portfolio.values().iterator();40
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}42
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public static void main(String[] args) {45
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Main myPortfolio = new Main();48
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myPortfolio.add(new Stock("ORCL", "Oracle", 500.0));50
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myPortfolio.add(new Stock("AAPL", "Apple", 200.0));52
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myPortfolio.add(new Stock("GOOG", "Google", 100.0));54
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myPortfolio.add(new Stock("IBM", "IBM", 50.0));56
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myPortfolio.add(new Stock("MCD", "McDonalds", 300.0));58
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// foreach loop (uses Iterator returned from iterator() method)61
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for (Stock stock : myPortfolio) {63
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System.out.println(stock);65
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}67
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myPortfolio.forEach((stock) -> System.out.println(stock));70
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}73
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}75
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class Stock {78
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private String symbol;80
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private String name;82
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private double shares;84
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public Stock(String symbol, String name, double shares) {87
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this.symbol = symbol;89
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this.name = name;91
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this.shares = shares;93
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}95
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