如何在Java中迭代一個列表？

The List interface extends Collection interface and stores a sequence of elements. The List interface provides two methods to efficiently insert and remove multiple elements at an arbitrary point in the list. Unlike allows duplicate elements, allows multiple null values if null value is allowed in the list.

Java List provides two kinds of iterators using iterator() or listIterator(). First kinds of iterators using iterator() or listIterator()。Y (

Iterator<Integer> iterator = list.iterator();
while(iterator.hasNext()) {
   System.out.print(iterator.next() + " ");
}

登入後複製

登入後複製

Iterator<Integer> iterator = list.iterator();
while(iterator.hasNext()) {
   System.out.print(iterator.next() + " ");
}

登入後複製

登入後複製

package com.tutorialspoint;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class CollectionsDemo {
   public static void main(String[] args) {
      List<Integer> list = new ArrayList<>(Arrays.asList(1,2,3,4,5));
      Iterator<Integer> iterator = list.iterator();
     
      while(iterator.hasNext()) {
         System.out.print(iterator.next() + " ");
      }
   }
}

登入後複製

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登入後複製

登入後複製

package com.tutorialspoint;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class CollectionsDemo {
   public static void main(String[] args) {
      List<Integer> list = new ArrayList<>(Arrays.asList(1,2,3,4,5));
      Iterator<Integer> iterator = list.listIterator();
     
      while(iterator.hasNext()) {
         System.out.print(iterator.next() + " ");
      }
   }
}

登入後複製

1 2 3 4 5

登入後複製

登入後複製

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