关于集合的遍历

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关于集合的遍历

A:存储字符串并遍历
import java.util.Collection;
import java.util.ArrayList;
import java.util.Iterator;

public class CollectionDemo {
public static void main(String[] args) {
//创建集合对象
Collection c = new ArrayList();

//创建并添加元素
c.add("hello");
c.add("world");
c.add("java");

//迭代器遍历集合
Iterator it = c.iterator();
while(it.hasNext()) {
String s =(String) it.next();
System.out.println(s);
}
}
}

B:存储自定义对象并遍历
public class Student {
private String name;
private int age;

public Student(){

}

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

public void getName(){

this.name=name;

}

public void getAge(){

this.age=age;

}

public String setName(){

return name;

}

public int setAge(){

return age;

}

}

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

public class StudentDemo {
public static void main(String[] args) {
//创建集合对象
Collection c = new ArrayList();

//创建学生对象
Student s1 = new Student("二蛋",27);
Student s2 = new Student("三蛋",30);
Student s3 = new Student("四蛋",30);
Student s4 = new Student("五蛋",25);
Student s5 = new Student("六蛋",16);

//添加元素
c.add(s1);
c.add(s2);
c.add(s3);
c.add(s4);
c.add(s5);

//迭代器遍历集合
Iterator it = c.iterator();
while(it.hasNext()) {
Student s = (Student)it.next();
System.out.println(s.getName()+"------------"+s.getAge());
}
}
}