JAVA学习---Collection子接口（List）以及List接口的常用方法

说明

		list.add(1,"Hello");
		System.out.println(list); //[123, Hello, 456, 789, Person [name=Tom, age=12]]
		
		Collection eles=new ArrayList();
		eles.add("Java");
		eles.add('!');
		list.addAll(2,eles);
		System.out.println(list); //[123, Hello, Java, !, 456, 789, Person [name=Tom, age=12]]
		
		
		System.out.println(list.get(1));  //Hello
		
		
		System.out.println(list.indexOf('!'));  //3
		System.out.println(list.lastIndexOf("o"));  //-1
		
		
		System.out.println(list.remove(1));  //Hello
		
		
		list.set(2, "Hello");
		System.out.println(list); //[123, Java, Hello, 456, 789, Person [name=Tom, age=12]]
		
		
		System.out.println(list.subList(1, 3));  //[Java, Hello]
		
		
		//Iterator迭代器方式
		Iterator iterator=list.iterator();
		while(iterator.hasNext()) {
			System.out.print(iterator.next()+" "); //123 Java Hello 456 789 Person [name=Tom, age=12]
		} 
		//增强for循环
		for(Object obj:list) {
			System.out.print(obj+" ");//123 Java Hello 456 789 Person [name=Tom, age=12]
		}
		//普通for循环
		for(int i=0;i