小编Kev*_*ltz的帖子

我正在完成学校的实验室作业,并在编译时收到此错误.程序运行正常,有点想修复导致错误的原因.程序代码和完整错误如下.一如既往地谢谢!

错误:注意:F:\ Java\Lab 8\Lab8.java使用未经检查或不安全的操作.注意:使用-Xlint重新编译:取消选中以获取详细信息.

码:

   import java.awt.*;
   import java.awt.event.*;
   import javax.swing.*;
   import javax.swing.event.*;
   import javax.swing.border.*;


   public class Lab8 extends JFrame {
       public Lab8()
           {

           // Create an array of Strings for age ranges
           String[] ageRanges = {"Under 20", "20-29", "30-39", "40-49", "50-59", "60 and Above"};
           JComboBox jcbo = new JComboBox(ageRanges);

           // Create an array of String destinations
           String[] destination = {"Mercury", "Venus", "Moon", "Mars", "Jupiter / Europa", "Saturn / Triton", "Pluto + Sharon"};
           JList jlst = new JList();

           // Declare …

我在Azure上托管了一个站点,其中阻止了对Google UrlShortner API的调用.我收到错误:

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "ipRefererBlocked",
    "message": "There is a per-IP or per-Referer restriction configured on your API key and the request does not match these restrictions. Please use the Google Developers Console to update your API key configuration if request from this IP or referer should be allowed.",
    "extendedHelp": "https://console.developers.google.com"
   }
  ],
  "code": 403,
  "message": "There is a per-IP or per-Referer restriction configured on your API key and the request does not …

我有两个滚动窗格,我试图设置滚动条始终可见.出于某种原因,当我尝试使用下面的代码(滚动代码)时,我得到一个错误"方法setHorizo​​ntalScrollBarPolicy(int)未定义类型JTextPane".有什么建议？

滚动代码:

scrollPane.setHorizontalScrollBarPolicy(
   JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane.setVerticalScrollBarPolicy(
   JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

我创建滚动窗格的代码:

JPanel ScrollPanes = new JPanel();
frame.getContentPane().add(ScrollPanes, BorderLayout.CENTER);
ScrollPanes.setLayout(new GridLayout(0, 2, 0, 0));

JTextPane textPane_0 = new JTextPane();
ScrollPanes.add(textPane_0);
textPane_0.setHorizontalScrollBarPolicy(
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
textPane_0.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

JTextPane textPane_1 = new JTextPane();
ScrollPanes.add(textPane_1);

完整代码:

package swing;

import java.awt.EventQueue;

public class Swing {

    private JFrame frame;
    private JTextField textField;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Swing window = new Swing();
                    window.frame.setVisible(true);
                } catch (Exception …

我需要在前面加上我不允许在课堂上使用IDE,我必须使用TextPad进行编译和运行.任何帮助将不胜感激.

有三个文件,一个驱动程序文件和另外两个类文件.Lab4文件是驱动程序文件,类文件是"ITEM"和"NAME".

编译驱动程序"Lab4"文件时出现以下错误.

     F:\Java\Lab 4A\Lab4.java:86: error: cannot find symbol
        System.out.println ("Manufacturer's Name: " + item.manName());
                                                      ^
      symbol:   method manName()
      location: variable item of type Item

"Lab4"文件的代码如下:

    import java.util.Scanner;

    public class Lab4
    {
     public static void main (String[] args)
    {
          String firstName = "";
          String lastName = "";
          String manName = "";
          float cost = 0.00f;
          int itemNum = 0;


        // Instantiate class files
        // Variables are declared because variables are expected in name.java file
        Name name = new Name("Bob", …

我的程序中有两个下拉框.从第一个下拉列表中选择项目时,它会在第二个下拉列表中填充可选项目.当我在第二个中选择某个内容然后在第一个中更改选择时,值保留在第二个中.如何在第一次更改时"重置"第二次下拉？

任何帮助都是极好的!

下拉是窗口形式.

我正在完成一个实验室作业,如果他们想要订购鱼类,则提示用户输入类型并输入每磅价格.在报告打印之前,需要提示用户输入鱼的类型和价格两次.

问题是程序在循环的第一个实例完成之前结束.(编写代码的方式,报告上的标题将打印两次,但这是在说明中.)

代码如下,非常感谢任何帮助.

#include <iostream> 
#include <iomanip>
#include <string>

using namespace std;

int main()
{
        float price;
    string fishType;
    int counter = 0;

    // Change the console's background color.
    system ("color F0");

    while (counter < 3){

    // Collect input from the user.
    cout << "Enter the type of seafood: ";
    cin >> fishType; // <------ FAILS AT THIS POINT. I GET THE PROMPT AND AT THE                                  "ENTER" IT DISPLAYS THE REPORT

    cout << "Enter the price per pound using dollars …

我正在编写一个计算阿姆斯特朗数字的C++类程序.该程序工作正常,但每个输出行应该读作:

Armstrong number 1: xxx
Armstrong number 2: xxx
Armstrong number 3: xxx
Armstrong number 4: xxx, etc...

计算是正确的,但是给出增量数字"阿姆斯特朗数字1",2,3等的计数器仅反映实际的强壮结果.我需要它来计算显示的行数.

代码如下.

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
#include <cmath>

using namespace std;

int main()
{
    // Change the console's background color.
    system ("color F0");

    // Declare the variables
    int i = 0, counter = 1, var1, var2, var3, var4;

    while (i < 1000)
    {
        var1 = i/100;
        var2 = (i % 100) / 10;
        var3 = (i % 100) …

我正在完成一项任务,我们必须计算运费.出于某种原因,我在执行时获得了无限循环.有些人可以看看这个并帮助我,我无法确定原因.

码:

#include <iostream> 
#include <iomanip> 
#include <cmath> 
#include <fstream> 

using namespace std; 

const double basic_charge = 12; 
const double Vsurcharge = 5; 
const double Dsurcharge = 4; 
const double Wsurcharge = 2; 

double calculate(double length, double width, double height)
{ 
    double volume; 
    volume = length * width * height; 
    return volume; 

} 
int main () 
{ 

    ifstream inFile; 
    ofstream prt("c:\\lab6a_out.txt"); 

    double length, width, height, x, volume, weight, total, shipping_cost; 
    total = 0; 

    cout << "    Shipping Information\n\n"; 
    cout << …

我对我正在进行的程序做了一些更改.很好的建议,我已经将JScrollPanel中的JTextArea更改为JList.出于某种原因,即使我已经编写了JList的内容,该区域显示为空白,大约1行高.我将每个JList的默认大小设置为(200,200).有任何想法吗？

码:

package SwingAssign2;

import java.awt.Dimension;
import java.awt.EventQueue;

import javax.swing.BorderFactory;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.ListModel;
import javax.swing.ListSelectionModel;

import java.awt.BorderLayout;

import javax.swing.JComboBox;
import javax.swing.JTextField;

import java.awt.FlowLayout;

import javax.swing.SwingConstants;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JList;
import javax.swing.AbstractListModel;

public class SwingAssign2 {

    private JFrame frame;
    private JTextField textField;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public …

我不知道为什么我会收到此错误,此代码非常简单.错误是:

ORA-00920:无效的关系运算符

代码是:

SELECT FIRST_NAME || ' ' || LAST_NAME AS "EMPLOYEES"
FROM F_STAFFS
WHERE LAST_NAME LIKE 'D%'
AND LAST_NAME LIKE '%a%' AND '%e%';

我试图在标题为"EMPLOYEES"的列中显示名字和姓氏,其中姓氏以"D"开头,姓氏包含字母"a"和"e".

谢谢!