This article shares four traversal methods in the ordered collection List. I hope it will be helpful to everyone.
(Learning video sharing: java course)
First create a Student class to create objects and provide parameterized and parameterless constructors.
package lesson1; public class Student { String name; int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Student(String name, int age) { super(); this.name = name; this.age = age; } public Student() { super(); // TODO Auto-generated constructor stub } }
The following are four types of traversal
package lesson1; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class ListTest { public static void main(String[] args) { //使用学生类创建四个对象,并给对象中的属性赋初值 Student s1 = new Student("zhangsan1",20); Student s2 = new Student("zhangsan2",21); Student s3 = new Student("zhangsan3",22); Student s4 = new Student("zhangsan4",23); //创建一个集合 List studentList = new ArrayList(); //将上面的四个学生对象添加到集合中 studentList.add(s1); studentList.add(s2); studentList.add(s3); studentList.add(s4); // 普通for循环遍历 // for (int i = 0 ; i < studentList.size() ; i++) { // Student s = (Student)studentList.get(i); // System.out.println(s.getName()); // System.out.println(s.getAge()); // } //增强for循环遍历 for (Object os:studentList) { Student s = (Student)os; System.out.println(s.getName()); System.out.println(s.getAge()); } //迭代器遍历 // Iterator it = studentList.iterator(); // while (it.hasNext()) { // Student s = (Student)it.next(); // System.out.println(s.getName()); // System.out.println(s.getAge()); // } //jdk 1.8版本提供的forEach()方法遍历,这种方法了解就行 // studentList.forEach((os)->{ // Student s = (Student)os; // System.out.println(s.getName()); // System.out.println(s.getAge()); // }); } }
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