資訊專欄INFORMATION COLUMN
摘要：集合類類型解釋的父類集集合中的元素不按特定方式排序，并且沒有重復(fù)對象。他的有些實現(xiàn)類能對集合中的鍵對象進(jìn)行排序。
集合類
2017-07-10 22:24:57
blog site
https://github.com/Fiz1994
package com.learn;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
/**
* Created by fiz on 7/10/17.
*/
public class CollectionTest {
public static void main(String[] a){
Collection collection = new ArrayList<>();
// add element
collection.add("item1");
collection.add("item2");
collection.add("item3");
collection.add("item4");
// remove
collection.remove("item1");
//流輸出打印
collection.forEach(System.out::println);
collection.stream().forEach(System.out::println);
//for
Iterator iterator = collection.iterator();
while (iterator.hasNext()){
System.out.println(iterator.next());
}
}
}
List
package com.learn;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import java.util.List;
/**
* Created by fiz on 7/10/17.
*/
public class ListTest {
public static void main(String[] a) {
List list = new ArrayList<>();
// add element
list.add("item1");
list.add("item2");
list.add("item3");
list.add("item4");
// remove
list.remove("item1");
//流輸出打印
list.forEach(System.out::println);
list.stream().forEach(System.out::println);
//for
Iterator iterator = list.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
// 比collection 新增的方法
System.out.println(list.get(2));
System.out.println(list.set(2,"fiz"));
System.out.println(list.get(2));
}
}
Set
