使用增强for循环遍历集合,请大家指!
package cn.itheima;
import java.util.ArrayList;
import java.util.Collection;
class Person{
String name;
int id;
@Override
public String toString() {
// TODO Auto-generated method stub
return this.name+this.id;
}
public Person(String name,int id) {
super();
this.name = name;
this.id=id;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + id;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
if (id != other.id)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
}
public class Demo5 {
/**
* @param args
*/
public static void main(String[] args) {
ArrayList c=new ArrayList();
c.add(new Person("李三",110));
c.add(new Person("张三",120));
c.add(new Person("王五",130));
System.out.println(new Person("王五",130));
Object[] o=c.toArray();
for(Object p:c){
Person p1=(Person)p;
if(p1.id==120){
System.out.println(p1);
}
}
}
}
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