private void SearchContact() { Search_contact = new JTextField(10); JPanel paneltextarea = new JPanel(); paneltextarea.add(new JLabel("请输入内容")); paneltextarea.add(Search_contact); paneltextarea.setBounds(30, 30, 100, 60); this.getContentPane().add(paneltextarea); }在以上代码如何让文字与输入框在同一行
时间: 2024-01-11 10:03:22 浏览: 30
要让文字与输入框在同一行,可以使用 FlowLayout 布局管理器,它会自动将组件按顺序排列在一行中。在你的代码中,可以将 paneltextarea 的布局管理器设置为 FlowLayout,如下所示:
```
private void SearchContact() {
Search_contact = new JTextField(10);
JPanel paneltextarea = new JPanel(new FlowLayout()); // 设置为 FlowLayout
paneltextarea.add(new JLabel("请输入内容"));
paneltextarea.add(Search_contact);
paneltextarea.setBounds(30, 30, 100, 60);
this.getContentPane().add(paneltextarea);
}
```
这样,"请输入内容" 和输入框将在同一行中水平排列。注意,如果输入框中输入的内容过长,可能会导致文字和输入框重叠或者溢出容器边界,需要根据实际情况调整输入框的宽度或者使用更复杂的布局管理器来避免这种情况。
相关问题
#include <stdio.h> #include <stdlib.h> #include"TXL.h" void SearchContact(const Contact* pc) { char name[NAME_MAX] = { 0 }; printf("请输入要查找联系人的姓名:>"); scanf("%s", name); int pos = FindByName(pc, name); if (pos == -1) { printf("通讯录中不存在该联系人!!!\n"); return; } printf("%-20s %-12s %-30s %-30s\n", "姓名", "电话","电子邮件","地址"); printf("%-20s %-12s %-30s %-30s\n", pc->data[pos].name,pc->data[pos].tele, pc->data[pos].email,pc->data[pos].addr); }有什么错误
这段代码是一个通讯录管理程序中的函数,用来根据联系人姓名查找对应的联系人信息并输出。函数接收一个指向常量通讯录结构体的指针,然后使用scanf函数从用户输入中读取要查找的联系人姓名,再调用FindByName函数在通讯录中查找对应的联系人,如果不存在则输出提示信息,如果存在则按照一定的格式输出联系人的姓名、电话、电子邮件和地址信息。
这段代码中可能存在的错误有:
1. FindByName函数返回的是联系人在通讯录中的下标,因此pos的类型应该是int而不是Contact类型中定义的Pos类型。
2. 函数中没有对用户输入的姓名进行长度检查,可能会导致数组越界或者缓冲区溢出问题。应该使用fgets函数或者限制scanf函数输入字符的数量来避免这个问题。
3. 函数中使用了printf函数和格式化字符串来输出联系人信息,但是如果输入的信息过长可能会超出格式化字符串的长度,造成输出错误。可以使用%.*s来限制字符串输出的长度,如:
```
printf("%-20s %-12s %-30s %-30.*s\n", pc->data[pos].name, pc->data[pos].tele, pc->data[pos].email, ADDR_MAX, pc->data[pos].addr);
```
java 实现通讯录管理系统代码
好的,以下是一个基于Java Swing和JDBC的通讯录管理系统的代码示例,仅供参考:
```java
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class AddressBook extends JFrame {
private JPanel contentPane;
private JTextField textFieldName;
private JTextField textFieldPhone;
private JTextField textFieldEmail;
private JTextArea textArea;
private JButton btnAdd;
private JButton btnDelete;
private JButton btnUpdate;
private JButton btnSearch;
private Connection conn;
private Statement stmt;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
AddressBook frame = new AddressBook();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public AddressBook() {
// Initialize database connection
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/addressbook", "root", "password");
stmt = conn.createStatement();
} catch (SQLException | ClassNotFoundException e) {
e.printStackTrace();
}
setTitle("Address Book");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblName = new JLabel("Name:");
lblName.setBounds(23, 20, 61, 16);
contentPane.add(lblName);
textFieldName = new JTextField();
textFieldName.setBounds(88, 15, 130, 26);
contentPane.add(textFieldName);
textFieldName.setColumns(10);
JLabel lblPhone = new JLabel("Phone:");
lblPhone.setBounds(23, 52, 61, 16);
contentPane.add(lblPhone);
textFieldPhone = new JTextField();
textFieldPhone.setBounds(88, 47, 130, 26);
contentPane.add(textFieldPhone);
textFieldPhone.setColumns(10);
JLabel lblEmail = new JLabel("Email:");
lblEmail.setBounds(23, 84, 61, 16);
contentPane.add(lblEmail);
textFieldEmail = new JTextField();
textFieldEmail.setBounds(88, 79, 130, 26);
contentPane.add(textFieldEmail);
textFieldEmail.setColumns(10);
btnAdd = new JButton("Add");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addContact();
}
});
btnAdd.setBounds(23, 127, 75, 29);
contentPane.add(btnAdd);
btnDelete = new JButton("Delete");
btnDelete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
deleteContact();
}
});
btnDelete.setBounds(110, 127, 75, 29);
contentPane.add(btnDelete);
btnUpdate = new JButton("Update");
btnUpdate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
updateContact();
}
});
btnUpdate.setBounds(197, 127, 75, 29);
contentPane.add(btnUpdate);
btnSearch = new JButton("Search");
btnSearch.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
searchContact();
}
});
btnSearch.setBounds(284, 127, 75, 29);
contentPane.add(btnSearch);
JLabel lblContacts = new JLabel("Contacts:");
lblContacts.setBounds(23, 168, 61, 16);
contentPane.add(lblContacts);
textArea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setBounds(23, 196, 414, 66);
contentPane.add(scrollPane);
}
private void addContact() {
try {
String name = textFieldName.getText();
String phone = textFieldPhone.getText();
String email = textFieldEmail.getText();
String sql = "INSERT INTO contacts (name, phone, email) VALUES ('" + name + "', '" + phone + "', '" + email + "')";
stmt.executeUpdate(sql);
JOptionPane.showMessageDialog(null, "Contact added successfully.");
} catch (SQLException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, "Failed to add contact.");
}
}
private void deleteContact() {
try {
String name = textFieldName.getText();
String sql = "DELETE FROM contacts WHERE name='" + name + "'";
stmt.executeUpdate(sql);
JOptionPane.showMessageDialog(null, "Contact deleted successfully.");
} catch (SQLException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, "Failed to delete contact.");
}
}
private void updateContact() {
try {
String name = textFieldName.getText();
String phone = textFieldPhone.getText();
String email = textFieldEmail.getText();
String sql = "UPDATE contacts SET phone='" + phone + "', email='" + email + "' WHERE name='" + name + "'";
stmt.executeUpdate(sql);
JOptionPane.showMessageDialog(null, "Contact updated successfully.");
} catch (SQLException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, "Failed to update contact.");
}
}
private void searchContact() {
try {
String name = textFieldName.getText();
String sql = "SELECT * FROM contacts WHERE name='" + name + "'";
ResultSet rs = stmt.executeQuery(sql);
if (rs.next()) {
String phone = rs.getString("phone");
String email = rs.getString("email");
textArea.setText("Name: " + name + "\nPhone: " + phone + "\nEmail: " + email);
} else {
JOptionPane.showMessageDialog(null, "Contact not found.");
}
} catch (SQLException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, "Failed to search for contact.");
}
}
}
```
以上代码实现了一个简单的通讯录管理系统,包含添加、删除、修改和查询联系人的功能。注意,该示例代码仅供参考,实际应用中还需要考虑安全性、性能优化等因素。
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