1.Collection容器类
如ArrayList类中
1 List<String> list = new ArrayList<String>(); 2 list.add("Red"); 3 list.add("Yellow"); 4 list.add("Blue"); 5 for(String element : list){ 6 System.out.printf("%s", element); 7 }
2.对Arrays数组的遍历
1 int[] numArray = {1, 2, 3, 4, 5, 6}; 2 for(int count = 0; count<numArray.length; count++){ 3 System.out.print(numArray[count]); 4 } 5 //for-each 6 for(int element : numArray){ 7 System.out.print(element); 8 }
3.实现了接口java.lang.Iterable<T>自行撰写的普通类
1 public void displayCatalog(){ 2 if(this.catalog.getNumberOfItems() == 0){ 3 stdErr.println("The catalog is empty"); 4 }else{ 5 for(CatalogItem item : this.catalog){ 6 stdOut.println(item.getCode() + " " + item.getTitle() + " " 7 + (item.isAvailable() ? "(A)" : "(NA)")); 8 } 9 }//从而Catalog类的实例可以放在:右边