Java中List接口与Map接口的使用

1.List接口

1）Student.java (主要的是List接口当中需要使用)

package lx.com.entity;

public class Student {
	private String number;
	private String name;
	
	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	public Student(String number, String name) {
		this.number = number;
		this.name = name;
	}
	
	public String getNumber() {
		return number;
	}
	
	public void setNumber(String number) {
		this.number = number;
	}
	
	public String getName() {
		return name;
	}
	
	public void setName(String name) {
		this.name = name;
	}
}

2)List_test

package lx.com.entity;
import java.util.*;

public class List_test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		List list1 = new ArrayList();
		list1.add("hello");
		list1.add("world");
		System.out.println(list1);
			
		Student stu1 = new Student("001","翠花");
		Student stu2 = new Student("002","川普");
		Student stu3 = new Student("003","碧落");
		List list2 = new ArrayList();
		list2.add(stu1);
		list2.add(stu2);
		list2.add(stu3);
		System.out.println(list2);
	}
}

 通过list1方式打印的是值，通过list2方式打印的是地址。

2.Map接口

package lx.com.entity;
import java.util.*;

public class Map_test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
			
//以键值对的形式输出，其中是乱序（集合）		
		Map m1 = new HashMap();
		m1.put("碧落", "1");
		m1.put("川普", "2");
		m1.put("翠花","3");
		m1.put("大郎", "4");
		System.out.println(m1);	
	}
}