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                >[success] # for each循環 1. Java5推出了增強型for循環語句,可以應用數組和集合的遍歷 ~~~ for(元素類型 變量名 : 數組/集合名稱) { 循環體; } ~~~ 2. **執行流程**,不斷地從數組/集合中取出一個元素賦值給變量名并執行循環體,直到取完所有元素為止。 ~~~ import java.util.ArrayList; import java.util.Collection; public class CollectionTest { public static void main(String[] args) { Collection arr = new ArrayList(); arr.add(1); arr.add(12); arr.add("122"); // 使用 for each結構實現集合和數組中元素的遍歷 代碼簡單且方法靈活 // 由調試源碼可知:該方式確實是迭代器的簡化版 for (Object obj : arr) { System.out.print(obj); // 1 12 122 } int[] ls = { 1, 2, 3, 4 }; for (int i : ls) { System.out.print(i);// 1 2 3 4 } } } ~~~
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