System.out.println("按下了键:" + KeyEvent.getKeyText(keyCode)); }获取小键盘的
时间: 2024-03-21 21:41:06 浏览: 34
我理解你的问题是如何获取小键盘的按键事件,可以使用Java AWT中的KeyEvent类来实现。你需要在KeyListener的keyPressed()方法中获取事件的keyCode,然后判断是否是小键盘的按键事件。代码示例:
```
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if (keyCode >= KeyEvent.VK_NUMPAD0 && keyCode <= KeyEvent.VK_NUMPAD9) {
// 小键盘按键事件
System.out.println("按下了小键盘:" + KeyEvent.getKeyText(keyCode));
}
}
```
这段代码会在按下小键盘数字键时输出相应的信息。注意,如果你想要获取小键盘的其他按键事件(如加号、减号等),需要用对应的KeyEvent常量来判断。
相关问题
将package shiyan3; public class Test { public static void main(String[] args) { try { Student student = new Student("Alice", "123456", "Computer Science"); System.out.println("Student name: " + student.getUsername()); System.out.println("Student password: " + student.getPassword()); System.out.println("Student major: " + student.getMajor()); Teacher teacher = new Teacher("Bob", "123456", "Mathematics"); System.out.println("Teacher name: " + teacher.getUsername()); System.out.println("Teacher password: " + teacher.getPassword()); System.out.println("Teacher department: " + teacher.getDepartment()); Admin admin = new Admin("Charlie", "123456", "Director"); System.out.println("Admin name: " + admin.getUsername()); System.out.println("Admin password: " + admin.getPassword()); System.out.println("Admin position: " + admin.getPosition()); } catch (Exception e) { System.out.println("An error occurred: " + e.getMessage()); } } }修改这段代码,使他有键盘输入的值
以下是修改后的代码,使用了Scanner类来获取键盘输入的值:
```java
package shiyan3;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
try {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter student name: ");
String studentName = scanner.nextLine();
System.out.print("Enter student password: ");
String studentPassword = scanner.nextLine();
System.out.print("Enter student major: ");
String studentMajor = scanner.nextLine();
Student student = new Student(studentName, studentPassword, studentMajor);
System.out.println("Student name: " + student.getUsername());
System.out.println("Student password: " + student.getPassword());
System.out.println("Student major: " + student.getMajor());
System.out.print("\nEnter teacher name: ");
String teacherName = scanner.nextLine();
System.out.print("Enter teacher password: ");
String teacherPassword = scanner.nextLine();
System.out.print("Enter teacher department: ");
String teacherDepartment = scanner.nextLine();
Teacher teacher = new Teacher(teacherName, teacherPassword, teacherDepartment);
System.out.println("Teacher name: " + teacher.getUsername());
System.out.println("Teacher password: " + teacher.getPassword());
System.out.println("Teacher department: " + teacher.getDepartment());
System.out.print("\nEnter admin name: ");
String adminName = scanner.nextLine();
System.out.print("Enter admin password: ");
String adminPassword = scanner.nextLine();
System.out.print("Enter admin position: ");
String adminPosition = scanner.nextLine();
Admin admin = new Admin(adminName, adminPassword, adminPosition);
System.out.println("Admin name: " + admin.getUsername());
System.out.println("Admin password: " + admin.getPassword());
System.out.println("Admin position: " + admin.getPosition());
scanner.close();
} catch (Exception e) {
System.out.println("An error occurred: " + e.getMessage());
}
}
}
```
public class Example { // 静态变量 public static int staticVariable = 10; // 静态常量 public static final int STATIC_FINAL_VARIABLE = 20; // 实例变量 public int instanceVariable = 30; // 实例常量 public final int FINAL_VARIABLE = 40; public void method() { // 局部变量 int localVariable = 50; System.out.println("静态变量:" + staticVariable); System.out.println("静态常量:" + STATIC_FINAL_VARIABLE); System.out.println("实例变量:" + instanceVariable); System.out.println("实例常量:" + FINAL_VARIABLE); System.out.println("局部变量:" + localVariable); } }
这是一个示例代码,展示了使用不同修饰符的变量的区别:
```java
public class Example {
// 静态变量
public static int staticVariable = 10;
// 静态常量
public static final int STATIC_FINAL_VARIABLE = 20;
// 实例变量
public int instanceVariable = 30;
// 实例常量
public final int FINAL_VARIABLE = 40;
public void method() {
// 局部变量
int localVariable = 50;
System.out.println("静态变量:" + staticVariable);
System.out.println("静态常量:" + STATIC_FINAL_VARIABLE);
System.out.println("实例变量:" + instanceVariable);
System.out.println("实例常量:" + FINAL_VARIABLE);
System.out.println("局部变量:" + localVariable);
}
}
```
在这个示例中,我们定义了一个名为`Example`的类,并声明了不同类型的变量。
- `staticVariable`是一个静态变量,通过类名直接访问,所有该类的实例共享相同的静态变量。在示例中,它的值为10。
- `STATIC_FINAL_VARIABLE`是一个静态常量,也可以通过类名直接访问,所有该类的实例共享相同的静态常量。在示例中,它的值为20。
- `instanceVariable`是一个实例变量,属于对象级别,每个对象都有自己的实例变量。在示例中,默认情况下它的值
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