本帖最后由 王虎 于 2012-10-13 13:29 编辑
上午老师留了一个小题：用集合存放三个Student对象，并用迭代器遍历Student,(Student对象里包含name sex age)
为此自己写了四种方法
写法一：--------------------------------------------------------
import java.util.Collection;
import java.util.Iterator;
import java.util.ArrayList;
class Test5
{
public static void main(String[] args)
{
Collection c = new ArrayList();
Student s1 = new Student();
s1.name="张三";
s1.sex="男";
s1.age=23;
Student s2 = new Student();
s2.name="李四";
s2.sex="男";
s2.age=24;
Student s3 = new Student();
s3.name="王五";
s3.sex="男";
s3.age=25;
c.add(s1);
c.add(s2);
c.add(s3);
Iterator it = c.iterator();
while(it.hasNext())
{
Student s = (Student)it.next();
System.out.println(s);
}
}
}
class Student
{
String name;
String sex;
int age;
public String toString()
{
return name+" "+sex+" "+age;
}
}
写法二 ------------------------------------------------------------
import java.util.Collection;
import java.util.Iterator;
import java.util.ArrayList;
class Test5
{
public static void main(String[] args)
{
Collection c = new ArrayList();
Student s1 = new Student();
s1.name="张三";
s1.sex="男";
s1.age=23;
Student s2 = new Student();
s2.name="李四";
s2.sex="男";
s2.age=24;
Student s3 = new Student();
s3.name="王五";
s3.sex="男";
s3.age=25;
c.add(s1);
c.add(s2);
c.add(s3);
Iterator it = c.iterator();
while(it.hasNext())
{
Object o = it.next();
System.out.println(o);
}
}
}
class Student
{
String name;
String sex;
int age;
public String toString()
{
return name+" "+sex+" "+age;
}
}
方法三：------------------------------------------------------
import java.util.Collection;
import java.util.Iterator;
import java.util.ArrayList;
class Test5
{
public static void main(String[] args)
{
Collection c = new ArrayList();
Student s1 = new Student("张三","男",23);
Student s2 = new Student("李四","男",24);
Student s3 = new Student("王五","男",25);
c.add(s1);
c.add(s2);
c.add(s3);
Iterator it = c.iterator();
while(it.hasNext())
{
Object o = it.next();
System.out.println(o);
}
}
}
class Student
{
private String name;
private String sex;
private int age;
public Student(String name,String sex,int age)
{
this.name = name;
this.sex=sex;
this.age=age;
}
public String toString()
{
return name+" "+sex+" "+age;
}
}
方法四：--------------------------------------------------------
import java.util.Collection;
import java.util.Iterator;
import java.util.ArrayList;
class Test5
{
public static void main(String[] args)
{
Collection c = new ArrayList();
Student s1 = new Student();
s1.setName("张三");
s1.setSex("男");
s1.setAge(23);
Student s2 = new Student();
s2.setName("李四");
s2.setSex("男");
s2.setAge(24);
Student s3 = new Student();
s3.setName("王五");
s3.setSex("男");
s3.setAge(25);
c.add(s1);
c.add(s2);
c.add(s3);
Iterator it = c.iterator();
while(it.hasNext())
{
Object o = it.next();
System.out.println(o);
}
}
}
class Student
{
private String name;
private String sex;
private int age;
public Student()
{
}
public void setName(String name)
{
this.name= name;
}
public void setSex(String sex)
{
this.sex=sex;
}
public void setAge(int age)
{
this.age=age;
}
public String getName()
{
return this.name;
}
public String getSex()
{
return this.sex;
}
public int getAge()
{
return this.age;
}
public String toString()
{
return name+" "+sex+" "+age;
}
}
写完之后感觉唯一感觉：编程无定法~
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