常用的List集合, 可以使用下面几种方式进行遍历
参考代码
import java.util.ArrayListimport java.util.Iterator
public class Test {
public static void main(String[] args) {
ArrayList<Integer> list = new ArrayList<Integer>()
list.add(5)
list.add(8)
list.add(9)
//方案一 推荐 .简洁
for (Integer e : list) {
System.out.print(e + ",")
}
//方案二
for (int i = 0 i < list.size() i++) {
System.out.println(list.get(i))
}
//方案三
Iterator<Integer> it = list.iterator()
while (it.hasNext()) {
System.out.println(it.next())
}
}
}
遍历方法代码如下:
import java.util.HashMapimport java.util.Map
public class App01 {
public static void main(String[] args) {
Map<String, String> map1 = new HashMap<String, String>()
map1.put("A", "ABC")
map1.put("B", "BCD")
map1.put("C", "CDE")
// 遍历
for(Map.Entry<String, String> entry : map1.entrySet()) {
System.out.println(entry.getKey() + "->" + entry.getValue())
}
}
}