Question

Java中迭代器怎么使用？

部分代码：
class Student{
String name;
int age;
String sex;
public Student(String _name,int _age,String _sex){
this.name = _name;
this.age = _age;
this.sex = _sex;
}

public String toString(){
return this.name + "," + this.age + "," + this.sex;
}
}

public class IteratorTest {
public static void main(String[] args) {
Student stu1 = new Student("孙彦波",22,"男");
Student stu2 = new Student("伍明智",23,"男");
Student stu3 = new Student("姚晓燕",20,"女");
ArrayList list = new ArrayList();
list.add(stu1);
list.add(stu2);
list.add(stu3);
Iterator iterator = list.iterator();
while(iterator.hasNext())
System.out.println(iterator.next());
}
}
问题：上面的Name，age和sex是一起输出的，有没有办法分开输出，比如“姓名：**，年龄：**，性别：**”，怎么实现？

Answer 1

修改Student的toString()方法啊。

public String toString(){
return “姓名：”+this.name + ", 年龄：" + this.age + ", 性别：" + this.sex;
}
就行了。如果想分别获取每一个属性，就添加几个方法
class Student{
String name;
int age;
String sex;
public Student(String _name,int _age,String _sex){
this.name = _name;
this.age = _age;
this.sex = _sex;
}

public String toString(){
return name + "," + age + "," + sex;
}

public String getName(){
return name;
}
public String getAge(){
return age;
}
public String getSex(){
return sex;
}
}

实例化对象后，对象的getName()取姓名 getAge()取年龄 getSex()去性别

追问

谢谢了，有点像JavaBean哦

Answer 2

修改 toString()

public String toString(){
return "姓名"+this.name + ", 年龄" + this.age + ", 性别" + this.sex;
}

追问

只能这样吗？有没有办法分别获取Name，age和Sex？

追答

修改这个

while(iterator.hasNext())
System.out.println(iterator.next());

为:
while(iterator.hasNext()){
Student s = (Student)iterator.next() ;
print("姓名: "+s.name);
print(", 年龄: "+s.age) ;
println(", 性别: "+s.sex);

}

外,迭代器的话 用 for in语句更方便

追问

谢谢了，表格中应该可以这样用

Answer 3

、、、