Java 使对象可迭代
扩展Iterable<；T>接口。
实例源码：
源代码：
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import java.util.HashMap;4
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import java.util.Iterator;6
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import java.util.List;/*时代Java公众号 - nowjava.com 提 供*/8
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import java.util.Map;10
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public class Main implements Iterable<Stock> {13
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Map<String, Stock> portfolio = new HashMap<>();16
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public void add(Stock stock) {19
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portfolio.put(stock.getSymbol(), stock);21
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}23
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public void add(List<Stock> stocks) {26
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for (Stock s : stocks) {28
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portfolio.put(s.getSymbol(), s);30
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}32
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}34
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@Override37
/* 38
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*时 代 Java - nowjava.com*/40
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public Iterator<Stock> iterator() {42
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return portfolio.values().iterator();44
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}46
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public static void main(String[] args) {49
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Main myPortfolio = new Main();51
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myPortfolio.add(new Stock("ORCL", "Oracle", 5010.0));53
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myPortfolio.add(new Stock("AAPL", "Apple", 2010.0));55
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myPortfolio.add(new Stock("GOOG", "Google", 1100.0));57
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myPortfolio.add(new Stock("IBM", "IBM", 510.0));59
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myPortfolio.add(new Stock("MCD", "McDonalds", 3010.0));61
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System.out.println("legacy for-each loop");64
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for (Stock stock : myPortfolio) {66
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System.out.println(stock);68
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}70
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System.out.println("using Java 8 foreach implementation");73
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myPortfolio.forEach(s -> System.out.println(s));75
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}77
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}79
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class UnmodifiableIterator {82
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public static <E> Iterator<E> wrap(final Iterator<E> iter) {84
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return new Iterator<E>() {86
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@Override89
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public boolean hasNext() {91
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return iter.hasNext();93
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}95
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@Override98
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public E next() {100
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return iter.next();102
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}104
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@Override107
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public void remove() {109
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throw new UnsupportedOperationException("Remove not supported.");111
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}113
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};115
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}117
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}119
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class Stock {122
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private String symbol;124
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private String name;126
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private double shares;128
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public Stock(String symbol, String name, double shares) {131
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this.symbol = symbol;133
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