Java初学之集合---ArrayList存储字符串和自定义对象并泛型遍历

A:案例演示：

ArrayList存储字符串并遍历 泛型版

B:代码示例:

import java.util.ArrayList;
import java.util.Iterator;

import com.heima.bean.Student;

public class Demo2_Generic {

	public static void main(String[] args) {
		//demo1();
		//demo2();
	}

	private static void demo2() {
		ArrayList<Student> list = new ArrayList<>();
		list.add(new Student("张三",23));
		list.add(new Student("李四",24));
		list.add(new Student("王五",25));
		list.add(new Student("赵六",26));
		Iterator<Student> it = list.iterator();
		while (it.hasNext()) {
			Student stu = it.next();
			System.out.println(stu.getName()+":"+stu.getAge());
			//next方法只能调用一次,如果调用多次会将指针向后移动多次
			//System.out.println(it.next().getName()+":"+it.next().getAge());
		}
	}

	private static void demo1() {
		ArrayList<String> list = new ArrayList<>();
		list.add("a");
		list.add("b");
		list.add("c");
		list.add("d");
		Iterator<String> it = list.iterator();
		while (it.hasNext()) {
			String str = it.next();
			System.out.println(str);
		}
	}

}