Collection(三) 增强for循环

import java.util.ArrayList;
import java.util.Collection;
//增强for循环，适用于数组或容器的简单遍历或内容的读取。
public class EnhanceFor {
	public static void main(String[] args) {
		int[] arr = {1,2,3,4,5};
		for(int i:arr){
			System.out.println(i);
		}
		Collection c = new ArrayList();
		 c.add(new Name("fi","li"));
		 c.add(new Name("gi","oi"));
		 c.add(new Name("ui","pi"));
		 for(Object obj:c){
			 System.out.println(obj);
		 }		
	}
}

 

Name类：

public class Name {
	private String firstName;
	private String lastName;
	public Name(String firstName, String lastName){
		this.firstName = firstName;
		this.lastName = lastName;
	}
	//当使用contains，removes时，需要在本类中重写equals方法
	public boolean equals(Object o){
		if(o instanceof Name){
			Name name = (Name)o;
			return (firstName.equals(name.firstName))&&(lastName.equals(name.lastName));
		}
		return super.equals(o);
	}
	public String getFirstName() {
		return firstName;
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	//重写equals应该重写hashCode方法，两对象相互equals他们的hashCode必须相等；
	//当一个对象作为索引（Map里的键）时要用hashCode
	public int hashCode(){
		return firstName.hashCode();
	}
	public String toString(){
		return firstName+","+lastName;
	}
}