【Java】三种不同方式遍历集合-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_57268251/article/details/133966368

本文介绍了在Java中使用传统for循环、迭代器和增强for循环三种方式遍历`List<Student>`对象集合的方法，展示了如何创建Student类实例并使用这些技巧进行操作。

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使用三种不同循环遍历List<Student>

请使用多种不同的方式遍历学生对象集合

传统 for 循环
迭代器Iterator
增强for循环底层基于迭代器Iterator

示例代码：

Student.java

package com.collection.Demo04;

public class Student {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Student(String name, Integer age) {
        this.name = name;
        this.age = age;
    }
}

Test07.java

package com.collection.Demo04;

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

/**
 * 传统 for 循环
 * 迭代器Iterator
 * 增强for循环 底层基于迭代器Iterator
 */
public class Test07 {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<Student>();
        students.add(new Student("name1", 32));
        students.add(new Student("name2", 21));
        students.add(new Student("name3", 23));
        //方式1——传统 for循环 遍历集合
        for (int i = 0; i < students.size(); i++) {
            Student student = students.get(i);
            System.out.println(student.getName() + "," + student.getAge());
        }
        //方式2—— 迭代器遍历集合
        Iterator<Student> iterator = students.iterator();
        while (iterator.hasNext()) {
            Student student = iterator.next();
            System.out.println(student.getName() + "," + student.getAge());
        }
        //方式3—— 增强for循环 for each
        for (Student student : students) {
            System.out.println(student.getName() + "," + student.getAge());
        }
    }
}

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