不同类型数据的数据格式（对象、数组、list容器、map容器、list内嵌list容器、map内嵌map容器、json）

package cn.itcast.jk;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSONArray;

public class Test
{
public static void main(String[] args)
{
User user = new User();
user.setId(0);
user.setPassword("123456");
user.setQuanxian(1);
user.setUsername("zhangsan");
System.out.println(user);

String[] a = {"1","2","3"};
for (String string : a)
{
System.out.println(string);
}

List list = new ArrayList<String>();
list.add("q");
list.add("w");
list.add("e");
System.out.println(list);

List list2 = new ArrayList<String>();
list2.add("q1");
list2.add("w1");
list2.add("e1");
list2.add("r1");
list2.add("t1");
// System.out.println(list2);

List list3 = new ArrayList();
list3.addAll(list);
list3.addAll(list2);
System.out.println(list3);

HashMap<Map<String,String>,Object> map = new HashMap<Map<String,String>,Object>();
Map<String, String> map1 = new HashMap<String,String>();
map1.put("1", "1");
Map<String, String> map2 = new HashMap<String,String>();
map2.put("2", "2");
Map<String, String> map3= new HashMap<String,String>();
map3.put("3", "3");
map.put(map1, "asda");
map.put(map2, "hfdg");
map.put(map3, "fghfg");
System.out.println(map);

String objJson = JSONArray.toJSONString(user);
System.out.println(objJson);
}
}

-----------------------------------------------------------------------------------------------

package cn.itcast.jk;

/**
* User entity. @author MyEclipse Persistence Tools
*/

public class User implements java.io.Serializable {

// Fields

private Integer id;
private String username;
private String password;
private Integer quanxian;

// Constructors

/** default constructor */
public User() {
}

/** full constructor */
public User(String username, String password) {
this.username = username;
this.password = password;
}

// Property accessors

public Integer getId() {
return this.id;
}

public void setId(Integer id) {
this.id = id;
}

public String getUsername() {
return this.username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return this.password;
}

public void setPassword(String password) {
this.password = password;
}

public Integer getQuanxian()
{
return quanxian;
}

public void setQuanxian(Integer quanxian)
{
this.quanxian = quanxian;
}

@Override
public String toString()
{
return "User [id=" + id + ", username=" + username + ", password=" + password + ", quanxian=" + quanxian + "]";
}

}

----------------------------------------------------------------打印结果-------------------------------------------------------------------------------------

User [id=0, username=zhangsan, password=123456, quanxian=1]
1
2
3
[q, w, e]
[q, w, e, q1, w1, e1, r1, t1]
{{3=3}=fghfg, {2=2}=hfdg, {1=1}=asda}
{"id":0,"password":"123456","quanxian":1,"username":"zhangsan"}