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📜  Java Swing-JSpinner

📅  最后修改于: 2020-09-30 06:39:25             🧑  作者: Mango

Java JSpinner

JSpinner类的对象是单行输入字段，允许用户从有序序列中选择数字或对象值。

JSpinner类声明

让我们看看javax.swing.JSpinner类的声明。

public class JSpinner extends JComponent implements Accessible

常用的构造函数：

Constructor Description
JSpinner() It is used to construct a spinner with an Integer SpinnerNumberModel with initial value 0 and no minimum or maximum limits.
JSpinner(SpinnerModel model) It is used to construct a spinner for a given model.

常用方法：

Method Description
void addChangeListener(ChangeListener listener) It is used to add a listener to the list that is notified each time a change to the model occurs.
Object getValue() It is used to return the current value of the model.

Java JSpinner示例

import javax.swing.*;  
public class SpinnerExample {
public static void main(String[] args) {  
JFrame f=new JFrame("Spinner Example");  
SpinnerModel value =
         new SpinnerNumberModel(5, //initial value
            0, //minimum value
            10, //maximum value
            1); //step
JSpinner spinner = new JSpinner(value); 
            spinner.setBounds(100,100,50,30);  
            f.add(spinner);  
            f.setSize(300,300);  
            f.setLayout(null);  
            f.setVisible(true);   
}
}

输出：

带有ChangeListener的Java JSpinner示例

ort javax.swing.*;  
import javax.swing.event.*;
public class SpinnerExample {
public static void main(String[] args) {  
JFrame f=new JFrame("Spinner Example");  
final JLabel label = new JLabel();          
             label.setHorizontalAlignment(JLabel.CENTER);  
             label.setSize(250,100);  
SpinnerModel value =
         new SpinnerNumberModel(5, //initial value
            0, //minimum value
            10, //maximum value
            1); //step
JSpinner spinner = new JSpinner(value); 
            spinner.setBounds(100,100,50,30);  
            f.add(spinner);  f.add(label);
           f.setSize(300,300);  
           f.setLayout(null);  
           f.setVisible(true);   
           spinner.addChangeListener(new ChangeListener() {
        public void stateChanged(ChangeEvent e) {
         label.setText("Value : " + ((JSpinner)e.getSource()).getValue());
        }
     });
}
}

输出：