我有一个对象列表 -
List<Object> sample = new ArrayList<Object>();
它包含以下值 -
[This is an apple., Ram is a boy., What is your name?].
我想像这样修改它 -
[{ "q": "This is an apple." }, { "q": "Ram is a boy" }, { "q": "What is your name?" }]
怎么做？
P.S - 我是Java新手。感谢您的帮助。
答案 0 :(得分：3)
您可以通过创建JSONObject列表来执行此操作，如下所示：
List<JSONObject> yourList = new ArrayList<JSONObject>();
for(Object obj: sample) {
JSONObject jsonObj = new JSONObject();
jsonObj.put("q",(String)obj);
yourList.add(jsonObj);
}
上面的代码将创建一个名为yourList的新列表，其中包含所需的数据格式。
答案 1 :(得分：2)
您可以将自定义模型用作：
class CustomObject {
String q;
...getters, setters etc
}
并进一步使用
List<CustomObject> = new ArrayList<CustomObject>();
答案 2 :(得分：0)
如果您使用的是jdk8或更高版本，请执行以下操作：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace RoboAnimate
{
public partial class Form1 : Form
{
string RxString;
string c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15,
c16, c17;
string fourbytesHexStr;
UInt32 fourbytesHex = 0;
byte A, B, C, D, E, F,timer1val;
bool do1=false, do2 = false, do3 = false, do4 = false, do5 = false, do6
= false, sequence1 = true;
private void timer1_Tick(object sender, EventArgs e)
{
timer1val++;
textBox4.Text = timer1val.ToString();
if (timer1val == 2) Do1();
if (timer1val == 5) Do2();
if (timer1val == 7) Do3();
if (timer1val == 9) Do4();
if (timer1val == 11) Do5();
if (timer1val == 13) Do6();
if (timer1val == 15) Do7();
if (timer1val == 17) Do8();
if (timer1val == 19) Do7();
if (timer1val == 21) Do6();
if (timer1val == 23) Do5();
if (timer1val == 25) Do4();
if (timer1val == 27) Do3();
if (timer1val == 29) Do2();
if (timer1val == 32)
{
Do1();
sequence1 = false;
timer1.Enabled = false;
timer1val = 0;
}
}
byte whichdo;
private void Form1_Load(object sender, EventArgs e)
{
}
private void Pos2_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 160, 30, 10, 20, 30, 24, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Pos3_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 160, 10, 10, 20, 30, 24, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Pos4_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 160, 10, 30, 60, 40, 24, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Pos5_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 160, 60, 30, 60, 40, 24, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Pos6_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 90, 60, 30, 60, 40, 24, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Pos7_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 90, 100, 60, 100, 40, 80, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Pos8_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 95, 90, 130, 100, 40, 80, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void ScrollA_Scroll(object sender, ScrollEventArgs e)
{
ServoA.Text = ScrollA.Value.ToString();
}
private void ScrollB_Scroll(object sender, ScrollEventArgs e)
{
ServoB.Text = ScrollB.Value.ToString();
}
private void ScrollC_Scroll(object sender, ScrollEventArgs e)
{
ServoC.Text = ScrollC.Value.ToString();
}
private void ScrollD_Scroll(object sender, ScrollEventArgs e)
{
ServoD.Text = ScrollD.Value.ToString();
}
private void ScrollE_Scroll(object sender, ScrollEventArgs e)
{
ServoE.Text = ScrollE.Value.ToString();
}
private void ScrollF_Scroll(object sender, ScrollEventArgs e)
{
ServoF.Text = ScrollF.Value.ToString();
}
private void Send_Click(object sender, EventArgs e)
{
A = Convert.ToByte(ServoA.Text);
B = Convert.ToByte(ServoB.Text);
C = Convert.ToByte(ServoC.Text);
D = Convert.ToByte(ServoD.Text);
E = Convert.ToByte(ServoE.Text);
F = Convert.ToByte(ServoF.Text);
// A B C D E
//byte[] M1bytesToSend = new byte[8] { 0x4A, 0x14, 0x0A, 0x3C, 0x64,
0x4B, 0x91, 0xCA };
byte[] M1bytesToSend = new byte[8] { A, B, C, D, E, F, 0x91, 0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void serialPort1_DataReceived(object sender,
SerialDataReceivedEventArgs e)
{
Thread.Sleep(50);
int i;
int bytes = serialPort1.BytesToRead;
byte[] buffer = new byte[bytes];
string[] hex = new string[bytes];
serialPort1.Read(buffer, 0, bytes);
RxString = ByteArrayToHexString(buffer);
for (i = 0; i < bytes; ++i)
{
hex[i] = buffer[i].ToString("X");
}
textBox2.Text = RxString;
textBox3.Text = bytes.ToString();
if (bytes == 9)
{
c1 = (hex[0]).PadLeft(2, '0');
c2 = (hex[1]).PadLeft(2, '0');
c3 = (hex[2]).PadLeft(2, '0');
c4 = (hex[3]).PadLeft(2, '0');
c5 = (hex[4]).PadLeft(2, '0');
c6 = (hex[5]).PadLeft(2, '0');
c7 = (hex[6]).PadLeft(2, '0');
c8 = (hex[7]).PadLeft(2, '0');
c9 = (hex[8]).PadLeft(2, '0');
fourbytesHexStr = string.Concat(c1, c2, c3, c4, c5, c6, c7, c8,
c9);
fourbytesHexStr = fourbytesHexStr.PadRight(8, '0');
textBox1.Text = fourbytesHexStr;
textBox3.Text = bytes.ToString();
serialPort1.DiscardInBuffer();
}
if (bytes == 8)
{
c1 = (hex[0]).PadLeft(2, '0');
c2 = (hex[1]).PadLeft(2, '0');
c3 = (hex[2]).PadLeft(2, '0');
c4 = (hex[3]).PadLeft(2, '0');
c5 = (hex[4]).PadLeft(2, '0');
c6 = (hex[5]).PadLeft(2, '0');
c7 = (hex[6]).PadLeft(2, '0');
c8 = (hex[7]).PadLeft(2, '0');
fourbytesHexStr = string.Concat(c1, c2, c3, c4, c5, c6, c7, c8);
fourbytesHexStr = fourbytesHexStr.PadRight(8, '0');
textBox1.Text = fourbytesHexStr;
textBox3.Text = bytes.ToString();
serialPort1.DiscardInBuffer();
}
if (bytes == 7)
{
c1 = (hex[0]).PadLeft(2, '0');
c2 = (hex[1]).PadLeft(2, '0');
c3 = (hex[2]).PadLeft(2, '0');
c4 = (hex[3]).PadLeft(2, '0');
c5 = (hex[4]).PadLeft(2, '0');
c6 = (hex[5]).PadLeft(2, '0');
c7 = (hex[6]).PadLeft(2, '0');
fourbytesHexStr = string.Concat(c1, c2, c3, c4, c5, c6, c7);
fourbytesHexStr = fourbytesHexStr.PadRight(8, '0');
textBox1.Text = fourbytesHexStr;
textBox3.Text = bytes.ToString();
serialPort1.DiscardInBuffer();
}
}
private string ByteArrayToHexString(byte[] buffer)
{
StringBuilder sb = new StringBuilder(buffer.Length * 3);
foreach (byte b in buffer)
sb.Append(Convert.ToString(b, 16).PadLeft(2, '0').PadRight(3, '
'));
return sb.ToString().ToUpper();
}
private void Pos1_Click(object sender, EventArgs e)
{
// Gripper
// A B C D E F
byte[] M1bytesToSend = new byte[8] { 115, 95, 80, 21, 31, 2, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Open_Click(object sender, EventArgs e)
{
serialPort1.PortName = "COM6";
serialPort1.BaudRate = 9600;
serialPort1.DataBits = 8;
serialPort1.Parity = Parity.None;
serialPort1.StopBits = StopBits.One;
serialPort1.Open();
if (serialPort1.IsOpen) PortStatus.Text = "PORT Opened...Click to
Start DAQ";
Close.Enabled = true;
Open.Enabled = false;
}
public Form1()
{
InitializeComponent();
whichdo = 100;
}
private void Animate1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
}
private void Do1()
{
byte[] M1bytesToSend = new byte[8] { 115, 95, 80, 21, 31, 2, 0x91,
0xCA };
serialPort1.Write(M1bytesToSend, 0, 8);
}
private void Do2()
{
byte[] M2bytesToSend = new byte[8] { 160, 30, 10, 20, 30, 24, 0x91,
0xCA };
serialPort1.Write(M2bytesToSend, 0, 8);
}
private void Do3()
{
byte[] M3bytesToSend = new byte[8] { 160, 10, 10, 20, 30, 24, 0x91,
0xCA };
serialPort1.Write(M3bytesToSend, 0, 8);
}
private void Do4()
{
byte[] M4bytesToSend = new byte[8] { 160, 10, 30, 60, 40, 24, 0x91,
0xCA };
serialPort1.Write(M4bytesToSend, 0, 8);
}
private void Do5()
{
byte[] M5bytesToSend = new byte[8] { 160, 60, 30, 60, 40, 24, 0x91,
0xCA };
serialPort1.Write(M5bytesToSend, 0, 8);
}
private void Do6()
{
byte[] M6bytesToSend = new byte[8] { 90, 60, 30, 60, 40, 24, 0x91,
0xCA };
serialPort1.Write(M6bytesToSend, 0, 8);
}
private void Do7()
{
byte[] M7bytesToSend = new byte[8] { 90, 100, 60, 100, 40, 80, 0x91,
0xCA };
serialPort1.Write(M7bytesToSend, 0, 8);
}
private void Do8()
{
byte[] M8bytesToSend = new byte[8] { 95, 90, 130, 100, 40, 80, 0x91,
0xCA };
serialPort1.Write(M8bytesToSend, 0, 8);
}
}
}
修改：您可以使用import java.util.*;
import java.util.stream.*;
public class HelloWorld{
public static void main(String []args){
List<String> sample = new ArrayList<String>(Arrays.asList("This is an apple.", "Ram is a boy.", "What is your name?"));
System.out.println(sample);
List<Map<String,String>> transformed = sample.stream()
.map(p -> {Map<String,String> m = new HashMap<String,String>(); m.put("q",p); return m;})
.collect(Collectors.toList());
System.out.println(transformed);
}
}
代替List<Map<String,String>>转换，也可以使用列表中所需的键值对。