package cn.cast.collection;import java.util.ArrayList;
import java.util.Collection;/*** @author zhangyu* @date 2021年08月22日 10:19 下午* 使用集合添加add()* 使用集合移除，返回boolean值*/
public class CollectionDemo {public static void main(String[] args) {method_1();method_2();method_3();method_4();method_5();method_6();}//添加add()//移除remove()public static void method_1(){Collection coll = new ArrayList();coll.add(123);coll.add(false);coll.add("张三");System.out.println(coll);boolean b = coll.remove(123);System.out.println(b);}//清空public static void method_2(){Collection coll = new ArrayList();coll.add(123);coll.add(false);coll.add("张三");coll.clear();System.out.println(coll);}//判断是否存在public static void method_3(){Collection coll = new ArrayList();coll.add(123);coll.add(false);coll.add("张三");boolean b = coll.contains(false);System.out.println(b);}//判断集合是否为空public static void method_4(){Collection coll = new ArrayList();boolean b = coll.isEmpty();System.out.println(b);}//判断集合长度public static void method_5(){Collection coll = new ArrayList();coll.add(123);coll.add(false);coll.add("张三");int size = coll.size();System.out.println(size);}//集合转数组public static void method_6(){Collection coll = new ArrayList();coll.add(123);coll.add(false);coll.add("张三");Object[] obj = coll.toArray();for (int x = 0 ;x<obj.length;x++){System.out.println(obj[x]);}}
}